BGP: Difference between revisions

Source [https://www.noction.com/knowledge-base/bgp-route-aggregation noction.com]

RA also known as BGP Route Summarization

A method to minimize the size of the routing table

Announcing the whole address block received from the Regional Internet Registry (RIR) to other ASes.

RA is opposite to non-aggregation routing, where individual sub-prefixes of the address block are announced to BGP peers.

RA reduces the size of the global routing table, decreases routers’ workload and saves network bandwidth.

*BGP Route Aggregation with Static Discard Route:

router bgp 3695

bgp log-neighbor-changes

network 70.36.0.0 mask 255.255.240.0

neighbor 12.0.0.2 remote-as 11260

!

ip route 70.36.0.0 255.255.240.0 Null0

*BGP Route Aggregation with Aggregate-address Command

router bgp 3695

bgp log-neighbor-changes

network 70.36.0.0 mask 255.255.255.0

aggregate-address 70.36.0.0 255.255.240.0

neighbor 12.0.0.2 remote-as 11260

*Option summary-only

*Option suppress-map

*Option unsuppress-map

*Option attribute-map

*Option advertise-map

*Option as-set