Deployment Guide

For each BGP peer session in the overlay network:

a. Configure the BGP peer using its Loopback IP address on the VTEP in ROUTER-BGP mode.

neighbor loopback-ip-address

b. Assign the BGP neighbor Loopback address to the autonomous system in ROUTER-BGP-NEIGHBOR mode. The neighbor

Loopback IP address is the source interface on the remote VTEP.

remote-as as-number

c. Use the local Loopback address as the source address in BGP packets sent to the neighbor in ROUTER-BGP-NEIGHBOR mode.

update-source loopback0

d. Send an extended community attribute to the BGP neighbor in ROUTER-BGP-NEIGHBOR mode.

send-community extended

e. Enable the peer session with the BGP neighbor in ROUTER-BGP-NEIGHBOR mode.

no shutdown

f. Configure the L2 VPN EVPN address family for VXLAN host-based routing to the BGP peer in ROUTER-BGP-NEIGHBOR mode.

address-family l2vpn evpn

g. Enable the exchange of L2VPN EVPN addresses with the BGP peer in ROUTER-BGP-NEIGHBOR mode.

activate

h. Return to ROUTER-BGP mode.

exit

i. Enter IPv4 address-family configuration mode from ROUTER-BGP mode.

address-family ipv4 unicast

j. Disable the exchange of IPv4 addresses with BGP peers in ROUTER-BGP mode.

no activate

k. Return to ROUTER-BGP-NEIGHBOR mode.

exit

l. (Optional) If all the leaf switches are configured in the same ASN:

• On each leaf switch, enter L2VPN EVPN address-family configuration mode from ROUTER-BGP-NEIGHBOR mode. Activate

the exchange of L2VPN EVPN addresses with BGP peers. Configure the switch to accept a route with the local AS number in

updates received from a peer in ROUTER-BGP-NEIGHBOR-AF mode.

OS10(config-router-bgp-neighbor)# address-family l2vpn evpn

OS10(config-router-neighbor-af)# activate

OS10(config-router-neighbor-af)# allowas-in 1

OS10(config-router-neighbor-af)# exit

OS10(config-router-bgp-neighbor)# exit

• On each spine switch, disable sender-side loop detection to leaf switch neighbors in ROUTER-BGP-NEIGHBOR-AF mode.

OS10(conf-router-neighbor)# address-family ipv4 unicast

OS10(conf-router-neighbor-af)# no sender-side-loop-detection

OS10(conf-router-neighbor-af)# exit

m. (Optional) In a VLT deployment, on each leaf switch, configure the number of multi-hop peer routes in ROUTER-BGP-NEIGHBOR

mode to ensure that the BGP EVPN peer session establishes over the VLT VTEP peer if all local links to spine switches are down.

OS10(conf-router-neighbor)# ebgp-multihop 1

2. Configure EVPN.

BGP EVPN for VXLAN