Connectivity Guide

!
neighbor 32.1.1.2
remote-as 104
no shutdown
!
address-family ipv4 unicast
Confederations
Another way to organize routers within an AS and reduce the mesh for IBGP peers is to congure BGP confederations. As with route
reectors, Dell EMC recommends BGP confederations only for IBGP peering involving many IBGP peering sessions per router.
When you congure BGP confederations, you break the AS into smaller sub-ASs. To devices outside your network, the confederations
appear as one AS. Within the confederation sub-AS, the IBGP neighbors are fully meshed and the MED, NEXT_HOP, and LOCAL_PREF
attributes maintain between confederations.
1 Enter the confederation ID AS number in ROUTER-BGP mode (1 to 65535 for 2–byte, 1 to 4294967295 for 4–byte).
confederation identifier as-number
2 Enter which confederation sub-AS are peers in ROUTER-BGP mode, from 1 to 65535 for 2–byte, 1 to 4294967295 for 4–byte. All
Confederation routers must be either 4 bytes or 2 bytes. You cannot have a mix of router ASN support.
confederation peers as-number [... as-number]
Congure BGP confederations
OS10(config)# router bgp 65501
OS10(conf-router-bgp-65501)# confederation identifier 100
OS10(conf-router-bgp-65501)# confederation peers 65502 65503 65504
OS10(conf-router-bgp-65501)# neighbor 1.1.1.2
OS10(conf-router-neighbor)# remote-as 65502
OS10(conf-router-neighbor)# no shutdown
OS10(conf-router-neighbor)# exit
OS10(conf-router-bgp-65501)# neighbor 2.1.1.2
OS10(conf-router-neighbor)# remote-as 65503
OS10(conf-router-neighbor)# no shutdown
OS10(conf-router-neighbor)# exit
OS10(conf-router-bgp-65501)# neighbor 3.1.1.2
OS10(conf-router-neighbor)# remote-as 65504
OS10(conf-router-neighbor)# no shutdown
OS10(conf-router-neighbor)# exit
OS10(conf-router-bgp-65501)# end
OS10# show running-configuration bgp
!
router bgp 65501
confederation identifier 100
confederation peers 65502 65503 65504
!
neighbor 1.1.1.2
remote-as 65502
no shutdown
!
neighbor 2.1.1.2
remote-as 65503
no shutdown
!
neighbor 3.1.1.2
remote-as 65504
no shutdown
Layer 3
349