EVPN over EBGP: we don't need IBGP session between S1 and S2

nathanbycroft · Oct 10, 2024 · 6100412 · 6100412
1 parent ae66c02
commit 6100412
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Showing 5 changed files with 3 additions and 16 deletions.
diff --git a/EVPN/ebgp/eos/S1.cfg b/EVPN/ebgp/eos/S1.cfg
@@ -120,10 +120,6 @@ router bgp 65100
    neighbor ebgp_intf_Ethernet4 remote-as 65004
    neighbor ebgp_intf_Ethernet4 description L4
    neighbor ebgp_intf_Ethernet4 send-community standard extended large
-   neighbor 10.0.0.6 remote-as 65100
-   neighbor 10.0.0.6 update-source Loopback0
-   neighbor 10.0.0.6 description S2
-   neighbor 10.0.0.6 send-community standard extended large
    neighbor interface Et1 peer-group ebgp_intf_Ethernet1
    neighbor interface Et2 peer-group ebgp_intf_Ethernet2
    neighbor interface Et3 peer-group ebgp_intf_Ethernet3

diff --git a/EVPN/ebgp/eos/S2.cfg b/EVPN/ebgp/eos/S2.cfg
@@ -120,10 +120,6 @@ router bgp 65100
    neighbor ebgp_intf_Ethernet4 remote-as 65004
    neighbor ebgp_intf_Ethernet4 description L4
    neighbor ebgp_intf_Ethernet4 send-community standard extended large
-   neighbor 10.0.0.5 remote-as 65100
-   neighbor 10.0.0.5 update-source Loopback0
-   neighbor 10.0.0.5 description S1
-   neighbor 10.0.0.5 send-community standard extended large
    neighbor interface Et1 peer-group ebgp_intf_Ethernet1
    neighbor interface Et2 peer-group ebgp_intf_Ethernet2
    neighbor interface Et3 peer-group ebgp_intf_Ethernet3

diff --git a/EVPN/ebgp/frr/S1.cfg b/EVPN/ebgp/frr/S1.cfg
@@ -51,9 +51,6 @@ router bgp 65100
  neighbor eth3 description L3
  neighbor eth4 interface remote-as 65004
  neighbor eth4 description L4
- neighbor 10.0.0.6 remote-as 65100
- neighbor 10.0.0.6 description S2
- neighbor 10.0.0.6 update-source lo
  !
  address-family ipv4 unicast
   network 10.0.0.5/32

diff --git a/EVPN/ebgp/frr/S2.cfg b/EVPN/ebgp/frr/S2.cfg
@@ -51,9 +51,6 @@ router bgp 65100
  neighbor eth3 description L3
  neighbor eth4 interface remote-as 65004
  neighbor eth4 description L4
- neighbor 10.0.0.5 remote-as 65100
- neighbor 10.0.0.5 description S1
- neighbor 10.0.0.5 update-source lo
  !
  address-family ipv4 unicast
   network 10.0.0.6/32

diff --git a/EVPN/ebgp/topology.yml b/EVPN/ebgp/topology.yml
@@ -5,8 +5,9 @@ plugin: [ fabric ]
 
 addressing.p2p.ipv4: True
 evpn.as: 65000
-evpn.session: [ ebgp ]
-bgp.community.ebgp: [ standard, extended ]
+evpn.session: [ ebgp ]                          # Activate EVPN on EBGP sessions
+bgp.community.ebgp: [ standard, extended ]      # Propagate extended community over EBGP
+bgp.sessions.ipv4: [ ebgp ]                     # ... and activate IPv4 AF only on EBGP sessions
 
 fabric:
   spines: 2