Connectivity Guide
OS10(conf-router-neighbor)# exit
OS10(conf-router-bgp-102)# template zanzibar
OS10(conf-router-template)# route-reflector-client
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 congured aggregate route to become active. AS_SET includes AS_PATH and community information from the routes 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
Congure 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 conguration
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 congure BGP confederations. As with route
reectors, Dell EMC recommends BGP confederations only for IBGP peering involving many IBGP peering sessions per router.
When you congure 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]
456
Layer 3