The following task is configured on a spine and creates a peer group called "leaf-group" and associates it with the listen range of 150.1.0.0/16. The spine waits for the incoming TCP session initiated by a leaf node. When the TCP connection is accepted, the spine verifies whether the incoming TCP session falls under one of the configured listen ranges. If the verification is successful, a new BGP dynamic peer is created and associated with the peer group "leaf-group". This newly created BGP dynamic peer inherits the attributes associated with the peer group.
Procedure
-
Enter the
configure terminal command to access global configuration mode.
device# configure terminal
-
Enter the
router bgp command to enable BGP routing.
device(config)# router bgp
-
Enter the
local-as command to configure the autonomous system number (ASN) in which your device resides.
device(config-bgp-router)# local-as 65520
-
Enter the
neighbor
peer-group command, specifying a name for the peer group, to create a peer group.
device(config-bgp-router)# neighbor leaf-group peer-group
-
Enter the
listen-limit command and specify a value to define the maximum number of BGP dynamic subnet range neighbors that can be created.
device(config-bgp-router)# listen-limit 30
-
Enter the
neighbor
peer-group
remote-as
command to specify an AS for the peer group.
device(config-bgp-router)# neighbor leaf-group remote-as 65550
-
Enter the
listen-range command, specifying an IP address and mask, to associate a subnet range with the BGP peer group. Use the
limit parameter and specify a value to set the maximum number of BGP dynamic neighbors that can be created.
device(config-bgp-router)# listen-range 150.1.0.0/16 peer-group leaf-group limit 20
-
Enter the
neighbor alternate-as
command with the
add parameter, specifying a value, to set an alternate AS number for listen range neighbors in the configured peer group.
device(config-bgp-router)# neighbor leaf-group alternate-as add 1210
-
Enter the
address-family l2vpn evpn command to enter L2VPN EVPN address family configuration mode.
device(config-bgp-router)# address-family l2vpn evpn
-
Enter the
neighbor
peer-group
activate command to enable the exchange of information with the peer group.
device(config-bgp-evpn)# neighbor leaf-group activate
Example
The following example creates a peer group called "leaf-group" and associates it with the listen range of 150.1.0.0/16. It also sets a limit on the number of dynamic BGP neighbors that can be created. An alternate AS number of listen range neighbors in the configured peer group is set.
device# configure terminal
device(config)# router bgp
device(config-bgp-router)# local-as 65520
device(config-bgp-router)# neighbor leaf-group peer-group
device(config-bgp-router)# listen-limit 30
device(config-bgp-router)# neighbor leaf-group remote-as 65550
device(config-bgp-router)# listen-range 150.1.0.0/16 peer-group leaf-group limit 20
device(config-bgp-router)# neighbor leaf-group alternate-as add 1210
device(config-bgp-router)# address-family l2vpn evpn
device(config-bgp-evpn)# neighbor leaf-group activate
