This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

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Wednesday, April 28, 2010

Question 57

What are the benefits of BGP peer group?

1 comments:

Packets Analyzed said...

Peer groups reduces the amount of CPU and memory needed to generate an update. Helps simplifies BGP configuration. BGP peer group allows the routing table to be looked up once which reduces system resources and the update is replicated to all peers as opposed to individually.


Example IBGP
"router bgp 100"
"neighbor IBGP peer-group"
"neighbor IBGP remote-as 100"
"neighbor IBGP update-source loopback 0"
"neighbor IBGP filter-list 1 in"
"neighbor IBGP filter-list 2 out"
"neighbor 10.0.0.3 peer-group IBGP'
"neighbor 10.0.0.4 peer-group IBGP"
"neighbor 10.0.0.5 peer-group IBGP"
"neighbor 10.0.0.6 peer-group IBGP"
"neighbor 10.0.0.7 peer-group IBGP"

Example EBGP
"router bgp 100"
"neighbor EBGP peer-group"
"neighbor EBGP filter-list 1 in"
"neighbor EBGP filter-list 2 out"
"neighbor 101.0.0.3 peer-group remote-as 200"
"neighbor 101.0.0.3 peer-group EBGP"
"neighbor 101.0.10.4 peer-group remote-as 400'
"neighbor 101.0.10.4 peer-group EBGP"
"neighbor 101.0.30.5 peer-group remote-as 500'
"neighbor 101.0.30.5 peer-group EBGP"
"neighbor 101.0.40.6 peer-group remote-as 600'
"neighbor 101.0.40.6 peer-group EBGP"
"neighbor 101.0.50.7 peer-group remote-as 700'
"neighbor 101.0.50.7 peer-group EBGP"

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