Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 295

! 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 configure BGP confederations. As with route reflectors, Dell EMC recommends BGP confederations only for IBGP peering involving many IBGP peering sessions per router. When you configure 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] Configure 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 3 295