Dell MX9116n EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 643

Aggregate routes OS10 provides multiple ways to aggregate routes in the BGP routing table. At least one route of the aggregate must be in the routing table for the configured aggregate route to become active. AS_SET includes AS_PATH and community information from the routes that are included in the aggregated route. 1. Assign an AS number in CONFIGURATION mode. router bgp as-number 2. Enter Address Family mode in ROUTER-BGP mode. address-family {[ipv4 | ipv6] [unicast]} 3. Aggregate address in ROUTER-BGPv4-AF mode. aggregate-address ip-address/mask Configure aggregate routes OS10(config)# router bgp 105 OS10(conf-router-bgp-105)# address-family ipv4 unicast OS10(conf-router-bgpv4-af)# aggregate-address 3.3.0.0/16 View running configuration OS10(conf-router-bgpv4-af)# do show running-configuration bgp ! Version ! Last configuration change at Jul 27 06:51:17 2016 ! ! router bgp 105 ! address-family ipv4 unicast aggregate-address 3.3.0.0/16 ! 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 Layer 3 643