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33 Dell EMC Networking Virtualization Overlay with BGP EVPN
7.3 Route map configuration
In this section, a route map is configured to redistribute loopback addresses used as router IDs via BGP.
1. Configure a route map named spine-leaf.
2. Set the route map to match the IP prefix list items named spine-leaf.
3. Configure an IP prefix list that specifies 10.2.1.0/24 ge 32 to include all addresses in the
10.2.1.0/24 address range with a mask greater than or equal to 32. This range includes the spine
router IDs.
Route map configuration
Spine1
Spine2
route-map spine-leaf permit 10
match ip address prefix-list spine-
leaf
ip prefix-list spine-leaf seq 10
permit 10.2.1.0/24 ge 32
route-map spine-leaf permit 10
match ip address prefix-list spine-
leaf
ip prefix-list spine-leaf seq 10
permit 10.2.1.0/24 ge 32
7.4 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.