Example-OSPF 1.8

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OSPF Networking Laboratory

Authors:
Fermín Galán (galan at dit.upm.es)
David Fernández (david at dit.upm.es)
version 1.8, October 3rd, 2007


Scenario

This example shows the VNUML implementation of a networking laboratory for OSPF dynamic routing protocol tests. It is a virtual implementation of the real-based network laboratory testbed of the Telematic Networks and Services Laboratory (in Spanish) last exercise at DIT-UPM grade course. This environment was used at ITHET'04 in order to illustrate VNUML application for high educational purposes.The laboratory tries to resemble to the network of a distributed organization. The core of the network is a backbone (routers RB1, RB2, RB3 and RB4) that interconnects several regional headquarters (from A to F) to the central organization headquarters. Each regional headquarters provides connectivity for two sites (from 1 to 12).

OSPF Lab

The network layout is shown in the picture. Click here to see a high resolution copy of the map.

  • Each site is composed of a computer (PCx) and an outbound router. The computer is configured with a default route to the outbound router.
  • Each regional headquarters is composed of a server (SRx), an inbound router (RRx2) and an outbound router (RRx1). The server is configured with a default route to the outbound router.
  • The central headquarters of several internals routers (RC1, RC2, RC3 and RC4) and a server (SC). All them are configured with default routes to the backbone. All the routers in the simulation (except for the ones in the central headquarters) run ospfd, a daemon process from the Zebra Suite that implements OSPF protocol. This protocol allows each router to configure dynamic routes so, after a convergence time, global connectivity is achive once the simulation has been started. You'll need to download the [ospf_lab_conf.tar.gz configuration for ospfd daemons] and unpacked it in the examples directory:
cd /usr/share/vnuml/examples
tar xfvz ospf_lab_conf.tar.gz

Note that this is a very big VNUML simulation, involving 51 virtual machines and 45 virtual networks. So, be aware that the hosting machine could get stressed (or even worse!). You can use the -w switch to increase the boot timeout (see User Manual for details). For example:

vnumlparser.pl -t ospf_lab.xml -v -w 120

(However, if your simulation is too big for your host, try to use a tiner version of the VNUML specification. For example, try to remove some of the regional headquarters and/or sites. There is a [ospf_lab_tiny.xml tiny version of ospf_lab.xml] with regional headquarters C, D and E; sites 2, 3 and 11; and servers SRA, RFB and SRF commented out in the XML)

Some examples of test performed with this virtual scenario:

  • Connectivity from PC01 to PC12:
PC01:~# traceroute -n 195.1.95.66
traceroute to 195.1.95.66 (195.1.95.66), 30 hops max, 38 byte packets
1  195.1.85.1  0.647 ms  0.614 ms  0.526 ms
2  195.1.95.193  0.976 ms  140.597 ms  0.814 ms
3  195.1.84.1  15.086 ms  1.097 ms  1.182 ms
4  195.1.95.161  1.404 ms  1.299 ms  1.322 ms
5  195.1.95.129  5.458 ms  2.132 ms  2.156 ms
6  195.1.95.138  11.272 ms  2.355 ms  2.301 ms
7  195.1.95.182  2.874 ms  2.798 ms  68.750 ms
8  195.1.94.2  3.377 ms  2.919 ms  3.116 ms
9  195.1.95.238  3.328 ms  3.189 ms  4.028 ms
10  195.1.95.66  4.896 ms  3.875 ms  4.395 ms
  • Connectivity from PC01 to PC04:
PC01:~# traceroute -n 195.1.87.66
traceroute to 195.1.87.66 (195.1.87.66), 30 hops max, 38 byte packets
1  195.1.85.1  1.127 ms  0.461 ms  0.494 ms
2  195.1.95.193  0.906 ms  0.701 ms  0.983 ms
3  195.1.84.1  1.230 ms  1.569 ms  1.249 ms
4  195.1.95.161  1.347 ms  1.309 ms  1.287 ms
5  195.1.95.166  2.131 ms  1.970 ms  1.753 ms
6  195.1.86.2  2.286 ms  2.622 ms  2.124 ms
7  195.1.95.206  2.449 ms  2.200 ms  2.647 ms
8  195.1.87.66  3.022 ms  2.741 ms  3.103 ms
  • Connectivity from PC01 to SC:
PC01:~# traceroute -n 10.0.11.22
traceroute to 10.0.11.22 (10.0.11.22), 30 hops max, 38 byte packets
1  195.1.85.1  0.599 ms  0.613 ms  0.503 ms
2  195.1.95.193  0.842 ms  0.790 ms  0.978 ms
3  195.1.84.1  1.291 ms  1.443 ms  1.084 ms
4  195.1.95.161  1.447 ms  1.318 ms  29.843 ms
5  195.1.95.129  2.391 ms  2.183 ms  1.761 ms
6  10.0.11.22  2.067 ms  2.153 ms  2.124 ms
  • OSPF information from ospfd at RB1:
RB1> show ip ospf route 
============ OSPF network routing table ============
N    10.0.11.0/24          [10] area: (0.0.0.0)
                           directly attached to eth3
N    195.1.84.0/26         [30] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.85.0/26         [50] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.85.64/26        [50] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.86.0/26         [30] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.87.0/26         [50] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.87.64/26        [50] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.88.0/26         [40] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.89.0/26         [60] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.89.64/26        [60] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.90.0/26         [40] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.91.0/26         [60] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.91.64/26        [60] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.92.0/26         [30] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.93.0/26         [50] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.93.64/26        [50] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.94.0/26         [30] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.95.0/26         [50] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.95.64/26        [50] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.95.128/30       [10] area: (0.0.0.0)
                           directly attached to eth1
N    195.1.95.132/30       [20] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.95.136/30       [20] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.95.140/30       [10] area: (0.0.0.0)
                           directly attached to eth2
N    195.1.95.160/30       [20] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.130, eth1
N    195.1.95.164/30       [20] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.95.168/30       [30] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.95.172/30       [30] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.95.176/30       [20] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.95.180/30       [20] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.95.192/30       [40] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.95.196/30       [40] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.95.200/30       [40] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.95.204/30       [40] area: (0.0.0.0)
                           via 195.1.95.130, eth1
N    195.1.95.208/30       [50] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.95.212/30       [50] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.95.216/30       [50] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.95.220/30       [50] area: (0.0.0.0)
                           via 195.1.95.130, eth1
                           via 195.1.95.142, eth2
N    195.1.95.224/30       [40] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.95.228/30       [40] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.95.232/30       [40] area: (0.0.0.0)
                           via 195.1.95.142, eth2
N    195.1.95.236/30       [40] area: (0.0.0.0)
                           via 195.1.95.142, eth2
 
============ OSPF external routing table ===========

RB1> show ip ospf neighbor 

Neighbor ID     Pri   State           Dead Time   Address         Interface           RXmtL RqstL DBsmL
195.1.95.165      1   Full/DR         00:00:37    195.1.95.130    eth1:195.1.95.129     0     0     0
195.1.95.181      1   Full/DR         00:00:33    195.1.95.142    eth2:195.1.95.141     0     0     0

RB1> show ip ospf interface 
...
eth1 is up, line protocol is up

    Internet Address 195.1.95.129/30, Area (0.0.0.0)
    Router ID 195.1.95.141, Network Type BROADCAST, Cost: 10
    Transmit Delay is 1 sec, State Backup, Priority 1
    Designated Router (ID) 195.1.95.165, Interface Address 195.1.95.130
    Backup Designated Router (ID) 195.1.95.141, Interface Address 195.1.95.129
    Timer intarvals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
      Hello due in 00:00:09
    Neighbor Count is 1, Adjacent neighbor count is 1
eth2 is up, line protocol is up

    Internet Address 195.1.95.141/30, Area (0.0.0.0)
    Router ID 195.1.95.141, Network Type BROADCAST, Cost: 10
    Transmit Delay is 1 sec, State Backup, Priority 1
    Designated Router (ID) 195.1.95.181, Interface Address 195.1.95.142
    Backup Designated Router (ID) 195.1.95.141, Interface Address 195.1.95.141
    Timer intarvals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
       Hello due in 00:00:09
    Neighbor Count is 1, Adjacent neighbor count is 1
eth3 is up, line protocol is up

    Internet Address 10.0.11.50/24, Area (0.0.0.0)
    Router ID 195.1.95.141, Network Type BROADCAST, Cost: 10
    Transmit Delay is 1 sec, State DR, Priority 1
    Designated Router (ID) 195.1.95.141, Interface Address 10.0.11.50
    No backup designated router on this network
    Timer intarvals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
      Hello due in 00:00:06
    Neighbor Count is 0, Adjacent neighbor count is 0
...

You can download the simulation file from [ospf_lab.xml here].

The example could be improved in several ways. For example:

  • The simulation is too big and this has a significative impact when building topology. A solution could be to split the simulation in several pieces, and building only desired parts for each testing case. Read more about this in the [../../user/index.html#concurrent_simulations VNUML User Manual].
  • The provided configuration for ospfd daemons is quite simple: all the routers uses OSPF in all their directly connected networks and a single area is use. A multiarea configuration could be more desirable. In addition, some networks (specially PPP-like links between some routers) shouldn't be globally advertised.

VNUML Description

 
 <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE vnuml SYSTEM "/usr/share/xml/vnuml/vnuml.dtd" [
  <!ENTITY VNUMLDIR "/usr/share/vnuml/">
  <!ENTITY REDIR  "</dev/null >/dev/null 2>&1 &">
]>
<!-- usual mask values:

  /24 -> 255.255.255.0
  /26 -> 255.255.255.192
  /28 -> 255.255.255.240
  /30 -> 255.255.255.252

-->
<vnuml>

  <global>
    <version>1.8</version>
    <simulation_name>ospf_lab</simulation_name>
    <ssh_version>1</ssh_version>
    <ssh_key>~/.ssh/identity.pub</ssh_key>
    <automac offset="0"/>
    <vm_mgmt type="private" network="10.250.0.0" mask="24" offset="0">
       <host_mapping/>
    </vm_mgmt>
    <vm_defaults>
       <filesystem type="cow">&VNUMLDIR;/filesystems/root_fs_tutorial</filesystem>
       <kernel>&VNUMLDIR;/kernels/linux</kernel>
       <console id="1">pts</console>
    </vm_defaults>
  </global>

  <net name="Core1" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="Core2" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="Core3" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="Core4" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="boneA" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="boneB" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="boneC" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="boneD" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="boneE" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="boneF" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="sedeA" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkA01" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkA02" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc01" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc02" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="sedeB" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkB03" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkB04" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc03" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc04" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="sedeC" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkC05" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkC06" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc05" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc06" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="sedeD" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkD07" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkD08" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc07" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc08" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="sedeE" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkE09" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkE10" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc09" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc10" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="sedeF" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkF11" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="linkF12" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc11" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="suc12" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="centraC" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="centra1" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="centra2" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="centra3" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>
  <net name="centra4" mode="uml_switch" sock="" type="lan" external="" vlan="" hub="no"/>

  <vm name="RB1" order="">
    <if id="1" net="Core1">
      <ipv4 mask="255.255.255.252">195.1.95.129</ipv4>
    </if>
    <if id="2" net="Core4">
      <ipv4 mask="255.255.255.252">195.1.95.141</ipv4>
    </if>
    <if id="3" net="centraC">
      <ipv4 mask="255.255.255.0">10.0.11.50</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RB1</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="RB2" order="">
    <if id="1" net="Core1">
      <ipv4 mask="255.255.255.252">195.1.95.130</ipv4>
    </if>
    <if id="2" net="Core2">
      <ipv4 mask="255.255.255.252">195.1.95.133</ipv4>
    </if>
    <if id="3" net="boneA">
      <ipv4 mask="255.255.255.252">195.1.95.161</ipv4>
    </if>
    <if id="4" net="boneB">
      <ipv4 mask="255.255.255.252">195.1.95.165</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RB2</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="RB3" order="">
    <if id="1" net="Core2">
      <ipv4 mask="255.255.255.252">195.1.95.134</ipv4>
    </if>
    <if id="2" net="Core3">
      <ipv4 mask="255.255.255.252">195.1.95.137</ipv4>
    </if>
    <if id="3" net="boneC">
      <ipv4 mask="255.255.255.252">195.1.95.169</ipv4>
    </if>
    <if id="4" net="boneD">
      <ipv4 mask="255.255.255.252">195.1.95.173</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RB3</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="RB4" order="">
    <if id="1" net="Core3">
      <ipv4 mask="255.255.255.252">195.1.95.138</ipv4>
    </if>
    <if id="2" net="Core4">
      <ipv4 mask="255.255.255.252">195.1.95.142</ipv4>
    </if>
    <if id="3" net="boneE">
      <ipv4 mask="255.255.255.252">195.1.95.177</ipv4>
    </if>
    <if id="4" net="boneF">
      <ipv4 mask="255.255.255.252">195.1.95.181</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RB4</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="RRA1" order="">
    <if id="1" net="boneA">
      <ipv4 mask="255.255.255.252">195.1.95.162</ipv4>
    </if>
    <if id="2" net="sedeA">
      <ipv4 mask="255.255.255.192">195.1.84.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRA1</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="RRA2" order="">
    <if id="1" net="sedeA">
      <ipv4 mask="255.255.255.192">195.1.84.2</ipv4>
    </if>
    <if id="2" net="linkA01">
      <ipv4 mask="255.255.255.252">195.1.95.193</ipv4>
    </if>
    <if id="3" net="linkA02">
      <ipv4 mask="255.255.255.252">195.1.95.197</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRA2</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="SRA" order="">
    <if id="1" net="sedeA">
      <ipv4 mask="255.255.255.192">195.1.84.3</ipv4>
    </if>
    <route type="ipv4" gw="195.1.84.1">default</route>
  </vm>

  <vm name="rout01" order="">
    <if id="1" net="linkA01">
      <ipv4 mask="255.255.255.252">195.1.95.194</ipv4>
    </if>
    <if id="2" net="suc01">
      <ipv4 mask="255.255.255.192">195.1.85.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout01</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC01" order="">
    <if id="1" net="suc01">
      <ipv4 mask="255.255.255.192">195.1.85.2</ipv4>
    </if>
    <route type="ipv4" gw="195.1.85.1">default</route>
  </vm>

  <vm name="rout02" order="">
    <if id="1" net="linkA02">
      <ipv4 mask="255.255.255.252">195.1.95.198</ipv4>
    </if>
    <if id="2" net="suc02">
      <ipv4 mask="255.255.255.192">195.1.85.65</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout02</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC02" order="">
    <if id="1" net="suc02">
      <ipv4 mask="255.255.255.192">195.1.85.66</ipv4>
    </if>
    <route type="ipv4" gw="195.1.85.65">default</route>
  </vm>

  <vm name="RRB1" order="">
    <if id="1" net="boneB">
      <ipv4 mask="255.255.255.252">195.1.95.166</ipv4>
    </if>
    <if id="2" net="sedeB">
      <ipv4 mask="255.255.255.192">195.1.86.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRB1</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="RRB2" order="">
    <if id="1" net="sedeB">
      <ipv4 mask="255.255.255.192">195.1.86.2</ipv4>
    </if>
    <if id="2" net="linkB03">
      <ipv4 mask="255.255.255.252">195.1.95.201</ipv4>
    </if>
    <if id="3" net="linkB04">
      <ipv4 mask="255.255.255.252">195.1.95.205</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRB2</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="SRB" order="">
    <if id="1" net="sedeB">
      <ipv4 mask="255.255.255.192">195.1.86.3</ipv4>
    </if>
    <route type="ipv4" gw="195.1.86.1">default</route>
  </vm>

  <vm name="rout03" order="">
    <if id="1" net="linkB03">
      <ipv4 mask="255.255.255.252">195.1.95.202</ipv4>
    </if>
    <if id="2" net="suc03">
      <ipv4 mask="255.255.255.192">195.1.87.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout03</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC03" order="">
    <if id="1" net="suc03">
      <ipv4 mask="255.255.255.192">195.1.87.2</ipv4>
    </if>
    <route type="ipv4" gw="195.1.87.1">default</route>
  </vm>
  <vm name="rout04" order="">

    <if id="1" net="linkB04">
      <ipv4 mask="255.255.255.252">195.1.95.206</ipv4>
    </if>
    <if id="2" net="suc04">
      <ipv4 mask="255.255.255.192">195.1.87.65</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout04</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC04" order="">
    <if id="1" net="suc04">
      <ipv4 mask="255.255.255.192">195.1.87.66</ipv4>
    </if>
    <route type="ipv4" gw="195.1.87.65">default</route>
  </vm>

  <vm name="RRC1" order="">
    <if id="1" net="boneC">
      <ipv4 mask="255.255.255.252">195.1.95.170</ipv4>
    </if>
    <if id="2" net="sedeC">
      <ipv4 mask="255.255.255.192">195.1.88.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRC1</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="RRC2" order="">
    <if id="1" net="sedeC">
      <ipv4 mask="255.255.255.192">195.1.88.2</ipv4>
    </if>
    <if id="2" net="linkC05">
      <ipv4 mask="255.255.255.252">195.1.95.209</ipv4>
    </if>
    <if id="3" net="linkC06">
      <ipv4 mask="255.255.255.252">195.1.95.213</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRC2</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="SRC" order="">
    <if id="1" net="sedeC">
      <ipv4 mask="255.255.255.192">195.1.88.3</ipv4>
    </if>
    <route type="ipv4" gw="195.1.88.1">default</route>
  </vm>

  <vm name="rout05" order="">
    <if id="1" net="linkC05">
      <ipv4 mask="255.255.255.252">195.1.95.210</ipv4>
    </if>
  <if id="2" net="suc05">
      <ipv4 mask="255.255.255.192">195.1.89.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout05</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC05" order="">
    <if id="1" net="suc05">
      <ipv4 mask="255.255.255.192">195.1.89.2</ipv4>
    </if>
    <route type="ipv4" gw="195.1.89.1">default</route>
  </vm>

  <vm name="rout06" order="">
    <if id="1" net="linkC06">
      <ipv4 mask="255.255.255.252">195.1.95.214</ipv4>
    </if>
    <if id="2" net="suc06">
      <ipv4 mask="255.255.255.192">195.1.89.65</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout06</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC06" order="">
    <if id="1" net="suc06">
      <ipv4 mask="255.255.255.192">195.1.89.66</ipv4>
    </if>
    <route type="ipv4" gw="195.1.89.65">default</route>
  </vm>

  <vm name="RRD1" order="">
    <if id="1" net="boneD">
      <ipv4 mask="255.255.255.252">195.1.95.174</ipv4>
    </if>
    <if id="2" net="sedeD">
      <ipv4 mask="255.255.255.192">195.1.90.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRD1</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="RRD2" order="">
    <if id="1" net="sedeD">
      <ipv4 mask="255.255.255.192">195.1.90.2</ipv4>
    </if>
    <if id="2" net="linkD07">
      <ipv4 mask="255.255.255.252">195.1.95.217</ipv4>
    </if>
    <if id="3" net="linkD08">
      <ipv4 mask="255.255.255.252">195.1.95.221</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRD2</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="SRD" order="">
    <if id="1" net="sedeD">
      <ipv4 mask="255.255.255.192">195.1.90.3</ipv4>
    </if>
    <route type="ipv4" gw="195.1.90.1">default</route>
  </vm>

  <vm name="rout07" order="">
    <if id="1" net="linkD07">
      <ipv4 mask="255.255.255.252">195.1.95.218</ipv4>
    </if>
    <if id="2" net="suc07">
      <ipv4 mask="255.255.255.192">195.1.91.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout07</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC07" order="">
    <if id="1" net="suc07">
      <ipv4 mask="255.255.255.192">195.1.91.2</ipv4>
    </if>
    <route type="ipv4" gw="195.1.91.1">default</route>
  </vm>

  <vm name="rout08" order="">
    <if id="1" net="linkD08">
      <ipv4 mask="255.255.255.252">195.1.95.222</ipv4>
    </if>
    <if id="2" net="suc08">
      <ipv4 mask="255.255.255.192">195.1.91.65</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout08</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC08" order="">
    <if id="1" net="suc08">
      <ipv4 mask="255.255.255.192">195.1.91.66</ipv4>
    </if>
    <route type="ipv4" gw="195.1.91.65">default</route>
  </vm>

  <vm name="RRE1" order="">
    <if id="1" net="boneE">
      <ipv4 mask="255.255.255.252">195.1.95.178</ipv4>
    </if>
    <if id="2" net="sedeE">
          <ipv4 mask="255.255.255.192">195.1.92.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRE1</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="RRE2" order="">
    <if id="1" net="sedeE">
      <ipv4 mask="255.255.255.192">195.1.92.2</ipv4>
    </if>
    <if id="2" net="linkE09">
      <ipv4 mask="255.255.255.252">195.1.95.225</ipv4>
    </if>
    <if id="3" net="linkE10">
      <ipv4 mask="255.255.255.252">195.1.95.229</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRE2</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="SRE" order="">
    <if id="1" net="sedeE">
      <ipv4 mask="255.255.255.192">195.1.92.3</ipv4>
    </if>
    <route type="ipv4" gw="195.1.92.1">default</route>
  </vm>

  <vm name="rout09" order="">
    <if id="1" net="linkE09">
      <ipv4 mask="255.255.255.252">195.1.95.226</ipv4>
    </if>
    <if id="2" net="suc09">
      <ipv4 mask="255.255.255.192">195.1.93.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout09</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC09" order="">
    <if id="1" net="suc09">
      <ipv4 mask="255.255.255.192">195.1.93.2</ipv4>
    </if>
    <route type="ipv4" gw="195.1.93.1">default</route>
  </vm>

  <vm name="rout10" order="">
    <if id="1" net="linkE10">
      <ipv4 mask="255.255.255.252">195.1.95.230</ipv4>
    </if>
    <if id="2" net="suc10">
      <ipv4 mask="255.255.255.192">195.1.93.65</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout10</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC10" order="">
    <if id="1" net="suc10">
      <ipv4 mask="255.255.255.192">195.1.93.66</ipv4>
    </if>
    <route type="ipv4" gw="195.1.93.65">default</route>
  </vm>

  <vm name="RRF1" order="">
    <if id="1" net="boneF">
      <ipv4 mask="255.255.255.252">195.1.95.182</ipv4>
    </if>
    <if id="2" net="sedeF">
      <ipv4 mask="255.255.255.192">195.1.94.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRF1</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="RRF2" order="">
    <if id="1" net="sedeF">
      <ipv4 mask="255.255.255.192">195.1.94.2</ipv4>
    </if>
    <if id="2" net="linkF11">
      <ipv4 mask="255.255.255.252">195.1.95.233</ipv4>
    </if>
    <if id="3" net="linkF12">
      <ipv4 mask="255.255.255.252">195.1.95.237</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/RRF2</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="SRF" order="">
    <if id="1" net="sedeF">
      <ipv4 mask="255.255.255.192">195.1.94.3</ipv4>
    </if>
    <route type="ipv4" gw="195.1.94.1">default</route>
  </vm>

  <vm name="rout11" order="">
    <if id="1" net="linkF11">
      <ipv4 mask="255.255.255.252">195.1.95.234</ipv4>
    </if>
    <if id="2" net="suc11">
      <ipv4 mask="255.255.255.192">195.1.95.1</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout11</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC11" order="">
    <if id="1" net="suc11">
      <ipv4 mask="255.255.255.192">195.1.95.2</ipv4>
    </if>
    <route type="ipv4" gw="195.1.95.1">default</route>
  </vm>

  <vm name="rout12" order="">
    <if id="1" net="linkF12">
      <ipv4 mask="255.255.255.252">195.1.95.238</ipv4>
    </if>
    <if id="2" net="suc12">
      <ipv4 mask="255.255.255.192">195.1.95.65</ipv4>
    </if>
    <forwarding type="ip"/>
    <filetree root="/etc/quagga" seq="start">conf/ospf_lab/rout12</filetree>
    <exec seq="start" type="verbatim">for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f; done</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/zebra  -d</exec>
    <exec seq="start" type="verbatim">/usr/lib/quagga/ospfd -d</exec>
    <exec seq="stop" type="verbatim">killall zebra</exec>
    <exec seq="stop" type="verbatim">killall ospfd</exec>
  </vm>

  <vm name="PC12" order="">
    <if id="1" net="suc12">
      <ipv4 mask="255.255.255.192">195.1.95.66</ipv4>
    </if>
    <route type="ipv4" gw="195.1.95.65">default</route>
  </vm>

  <vm name="RC1" order="">
    <if id="1" net="centraC">
      <ipv4 mask="255.255.255.0">10.0.11.1</ipv4>
    </if>
    <if id="2" net="centra1">
      <ipv4 mask="255.255.255.240">10.0.12.1</ipv4>
    </if>
    <route type="ipv4" gw="10.0.11.50">default</route>
  </vm>

  <vm name="RC2" order="">
    <if id="1" net="centraC">
      <ipv4 mask="255.255.255.0">10.0.11.2</ipv4>
    </if>
    <if id="2" net="centra2">
      <ipv4 mask="255.255.255.240">10.0.12.17</ipv4>
    </if>
    <route type="ipv4" gw="10.0.11.50">default</route>
  </vm>

  <vm name="RC3" order="">
    <if id="1" net="centraC">
      <ipv4 mask="255.255.255.0">10.0.11.3</ipv4>
    </if>
    <if id="2" net="centra3">
      <ipv4 mask="255.255.255.240">10.0.32.1</ipv4>
    </if>
    <route type="ipv4" gw="10.0.11.50">default</route>
  </vm>

  <vm name="RC4" order="">
    <if id="1" net="centraC">
      <ipv4 mask="255.255.255.0">10.0.11.4</ipv4>
    </if>
    <if id="2" net="centra3">
      <ipv4 mask="255.255.255.240">10.0.12.49</ipv4>
    </if>
    <route type="ipv4" gw="10.0.11.50">default</route>
  </vm>

  <vm name="SC" order="">
    <if id="1" net="centraC">
      <ipv4 mask="255.255.255.0">10.0.11.22</ipv4>
    </if>
  <route type="ipv4" gw="10.0.11.50">default</route>
  </vm>

</vnuml>

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