Multi-platform BGP anycast example

multi-platform/bgp-anycast/README.md

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+# Multi-Platform BGP Anycast Lab
+
+This lab illustrates the *netsim-tools* multi-platform custom configuration templates.
+
+![Lab topology](multi-platform-bgp-anycast.png)
+
+Notes:
+* Anycast nodes are a mix of Cisco IOSv, Arista vEOS, and Cumulus VX
+* Leaf nodes are a mix of Cisco IOSv and Arista vEOS
+* Anycast configuration templates are in the `bgp-anycast` directory
+* *BGP Additional Paths* configuration templates are in the `bgp-addpath` directory

multi-platform/bgp-anycast/bgp-addpath/eos.j2

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+router bgp {{ bgp.as }}
+ maximum-paths 16
+ bgp additional-paths install ecmp-primary
+{% for n in bgp.neighbors if n.type == 'ibgp' %}
+ neighbor {{ n.ipv4 }} additional-paths send any
+{% endfor %}

multi-platform/bgp-anycast/bgp-addpath/ios.j2

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+router bgp {{ bgp.as }}
+ address-family ipv4 unicast
+  bgp additional-paths select all
+  bgp additional-paths send receive
+  maximum-paths 16
+  maximum-paths ibgp 16
+{% for n in bgp.neighbors if n.type == 'ibgp' %}
+  neighbor {{ n.ipv4 }} advertise additional-paths all
+{% endfor %}

multi-platform/bgp-anycast/bgp-anycast/cumulus.j2

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+{% if bgp is defined and bgp.anycast is defined %}
+interface lo
+ ip address {{ bgp.anycast }} label anycast
+!
+router bgp {{ bgp.as }}
+ address-family ipv4
+  network {{ bgp.anycast|ipaddr('0') }}
+{% endif %}

multi-platform/bgp-anycast/bgp-anycast/eos.j2

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+{% if bgp is defined and bgp.anycast is defined %}
+interface loopback 42
+ ip address {{ bgp.anycast }}
+!
+router bgp {{ bgp.as }}
+ address-family ipv4
+  network {{ bgp.anycast|ipaddr('0') }}
+{% endif %}

multi-platform/bgp-anycast/bgp-anycast/ios.j2

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+{% if bgp is defined and bgp.anycast is defined %}
+interface loopback 42
+ ip address {{ bgp.anycast|ipaddr('address') }} {{ bgp.anycast|ipaddr('netmask') }}
+!
+router bgp {{ bgp.as }}
+ address-family ipv4
+  network {{ bgp.anycast|ipaddr('address') }} mask {{ bgp.anycast|ipaddr('netmask') }}
+{% endif %}

multi-platform/bgp-anycast/graph.dot

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+graph {
+  bgcolor="transparent"
+  node [shape=box, style="rounded,filled" fontname=Verdana]
+  edge [fontname=Verdana labelfontsize=10 labeldistance=1.5]
+  subgraph cluster_65000 {
+    bgcolor="#e8e8e8"
+    fontname=Verdana
+    margin=16
+    label="AS 65000"
+    l1 [
+      label=<l1 [iosv]<br /><sub>10.0.0.1/32</sub>>
+      fillcolor="#ff9f01"
+    ]
+    l2 [
+      label=<l2 [eos]<br /><sub>10.0.0.2/32</sub>>
+      fillcolor="#ff9f01"
+    ]
+    l3 [
+      label=<l3 [iosv]<br /><sub>10.0.0.3/32</sub>>
+      fillcolor="#ff9f01"
+    ]
+    s1 [
+      label=<s1 [iosv]<br /><sub>10.0.0.4/32</sub>>
+      fillcolor="#ff9f01"
+    ]
+  }
+  subgraph cluster_65101 {
+    bgcolor="#e8e8e8"
+    fontname=Verdana
+    margin=16
+    label="AS 65101"
+    a1 [
+      label=<a1 [iosv]<br /><sub>10.0.0.5/32</sub>>
+      fillcolor="#ff9f01"
+    ]
+    a2 [
+      label=<a2 [eos]<br /><sub>10.0.0.6/32</sub>>
+      fillcolor="#ff9f01"
+    ]
+    a3 [
+      label=<a3 [cumulus]<br /><sub>10.0.0.7/32</sub>>
+      fillcolor="#ff9f01"
+    ]
+  }
+ l1 -- s1 [ ]
+ l2 -- s1 [ ]
+ l3 -- s1 [ ]
+ a1 -- l2 [ ]
+ a2 -- l2 [ ]
+ a3 -- l3 [ ]
+}

multi-platform/bgp-anycast/topology.yml

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+#
+# Baseline OSPF+BGP topology
+#
+# Anycast nodes are in AS 65101, core network is AS 65000
+# Anycast prefixes are advertised via EBGP
+#
+
+module: [ ospf, bgp ]
+defaults.bgp.extra_attributes.node: [ anycast ]
+
+bgp:
+  as_list:
+    65000:
+      members: [ l1, l2, l3, s1 ]
+      rr: [ s1 ]
+    65101:
+      members: [ a1,a2,a3 ]
+
+groups:
+  as65000:
+    config: [ bgp-addpath ]
+  as65101:
+    config: [ bgp-anycast ]
+    node_data:
+      bgp.anycast: 10.42.42.42/32
+      bgp.advertise_loopback: False
+
+defaults.device: iosv
+
+nodes: 
+  l1:
+  l2:
+    device: eos
+  l3:
+  s1:
+  a1:
+  a2:
+    device: eos
+  a3:
+    device: cumulus
+
+links: [ s1-l1, s1-l2, s1-l3, l2-a1, l2-a2, l3-a3 ]