Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Community Member

BGP

route-map AS15330-IN permit 100

description INFORELAY

set local-preference 130

set community 9583:15330 9583:62400 9583:62404 9583:62700 additive

Can any one explain how this set community command works here

3 REPLIES
Cisco Employee

Re: BGP

It adds the above 4 communities to the set of communities already attached to the prefix.

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Community Member

Re: BGP

can i please know what is the use of this

Hall of Fame Super Gold

Re: BGP

rangaprabhu

The community value can be used by BGP routers to help make decisions about routes. There are only a very few communities with fixed meaning. Each organization that uses communities picks the values that it will use and assigns the meaning to those values. A community might be used for example to indicate that a route was leaned from a direct customer of some provider. Other customers of that provider might want to prefer that route without consideration of path length (for example). Some of the ISPs have set up systems of community values to communicate information about routes to their customers.

Based on the name of the route map it appears that it is applied to traffic received from a particular peer and assigns the community values. Those community values could be used by other BGP routers within that AS to make decisions, or the community values could be advertised to peers in other ASes to help them make decisions. There is no way for us to know the particular meaning of these communities.

HTH

Rick

93
Views
3
Helpful
3
Replies
CreatePlease to create content