Deployment Guide

28 Dell EMC Networking Virtualization Overlay with BGP EVPN
6.9 BGP configuration
Note: AS and router ID numbers used in this section are from Figure 9. IP addresses are from Table 1.
1. Start BGP configuration with the router bgp AS_number command.
2. Enable BFD, specify BFD timers, and enable the BFD active role.
3. Specify to redistribute loopback routes into BGP for the IPv4 unicast address family.
4. Enable ECMP with the bestpath as-path multipath-relax command.
5. Set the eBGP maximum paths to 2 since there are two paths (one through each spine switch).
6. Enable graceful restart.
7. Configure the neighbors that share routes to the VTEPs:
a. Specify the neighbor by its link IP address per Table 1.
b. Set the advertisement interval.
c. Enable BFD.
d. Enable fall-over.
e. Specify the remote autonomous system number.
f. Specify the IPv4 unicast address family.
8. Configure the neighbors that share control plane information via EVPN instances:
a. Specify the neighbor by its router ID number per Figure 9.
b. Allow up to two hops with the ebgp-multihop command.
c. Specify the remote autonomous system number.
d. Enable extended communities.
e. Specify loopback1 for establishing the BGP sessions.
f. Disable the IPv4 unicast address family and activate the EVPN address family.
9. Configure the VLT leaf peer as an iBGP neighbor.
a. Specify the neighbor by its link IP address per Table 1.
b. Specify the remote autonomous system number.
BGP Configuration
Leaf1a
Leaf1b
router bgp 65201
bfd all-neighbors interval 200 min_rx
200 multiplier 3 role active
address-family ipv4 unicast
redistribute connected route-map
spine-leaf
bestpath as-path multipath-relax
maximum-paths ebgp 2
graceful-restart role receiver-only
neighbor 192.168.1.0
advertisement-interval 5
bfd
fall-over
remote-as 65101
address-family ipv4 unicast
router bgp 65201
bfd all-neighbors interval 200 min_rx
200 multiplier 3 role active
address-family ipv4 unicast
redistribute connected route-map
spine-leaf
bestpath as-path multipath-relax
maximum-paths ebgp 2
graceful-restart role receiver-only
neighbor 192.168.1.2
advertisement-interval 5
bfd
fall-over
remote-as 65101
address-family ipv4 unicast