Deploying unnumbered BGP involves two steps. The first step is to configure the interfaces that connect the leaf node to the spine nodes. The second step is to enable BGP neighbor sessions on these interfaces as shown in the following Leaf1 configuration.
The deployment steps are detailed here:
- Configure the interfaces to support Unnumbered BGP.
The interface eth1/1/3 and eth1/1/4 on Leaf1 from above topology are configured as follows:
Leaf1# configure terminal
Leaf1 (config) # interface range ethernet1/1/3-1/1/4
Leaf1 (conf-range-eth1/1/3-1/1/4) # ipv6 nd send-ra
Leaf1 (conf-range-eth1/1/3-1/1/4) # ipv6 nd min-ra-interval 3
Leaf1 (conf-range-eth1/1/3-1/1/4) # ipv6 nd max-ra-interval 4
The min-ra-interval and max-ra-interval are optional commands and need not be used. The default values for these two parameters are set to 3 and 4, respectively.
- Configure a BGP template and use it in neighbor command.
Leaf1# show running-config bgp
router-id 100.1.1.1
!
address-family ipv4 unicast
network 10.1.1.1/32
!
template ebgp_session
send-community extended
!
address-family l2vpn evpn
activate
!
neighbor interface ethernet1/1/3
inherit template ebgp_session inherit-type ebgp
no shutdown
!
neighbor interface ethernet1/1/4
inherit template ebgp_session inherit-type ebgp
no shutdown
