BGP Configuration Assistance

[davidhuynh5]

Hello Experts,

Please review the attachmet.  Our corporate office has decided to deploy BGP on our new DWDM ring and OSPF as the IGP.

I am familiar with OSPF, but have minimal knowledge of BGP. Corporate engineers sent us the BGP configurations that we must load on our core routers. Before loading them on a production network, I've decided to lab up the topology to understand the concept.  I don't have a problem applying the configuration to a device - it's understanding the configuration and concept. Can help explain to me what the **** configuration means. Thanks in advance.

router bgp 64999       

no synchronization *************?    

bgp deterministic-med  *************?

bgp dampening  10 2000 4000 30 *************?

bgp log-neighbor-changes      

redistribute connected

neighbor RR_CLIENTS peer-group

neighbor RR_CLIENTS description Peer Group for RR clients     

neighbor RR_CLIENTS update-source loopback0   

neighbor RR_CLIENTS route-reflector-client    

neighbor RR_CLIENTS remote-as 64999   

neighbor RR_CLIENTS authentication RR2RRCLIENT

neighbor RR_CLIENTS next-hop-self     

neighbor RR_CLIENTS send-community *************?    

neighbor RR_ROUTERS peer-group

neighbor RR_ROUTERS description peer group for RR peering     

neighbor RR_ROUTERS remote-as 64999   

neighbor RR_ROUTERS update-source loopback0   

neighbor RR_ROUTERS authentication RR2RR      

neighbor RR_ROUTERS next-hop-self     

neighbor RR_ROUTERS send-community *************?   

neighbor DIST_ROUTERS peer-group *************?      

neighbor DIST_ROUTERS description peer group for EBGP with distro routers     

neighbor DIST_ROUTERS authentication core2distro      

neighbor DIST_ROUTERS send-community *************? 

neighbor x.x.x.x peer-group RRCLIENTS *************? is this incorrect? should it be RR_CLIENTS. 

neighbor x.x.x.x description bimc-core-r1     

neighbor x.x.x.x  peer-group RRCLIENTS *************? is this incorrect? should it be RR_CLIENTS.

neighbor x.x.x.x description bimc-core-r2     

neighbor x.x.x.x peer-group RR_ROUTERS

neighbor x.x.x.x description {xxx}-core-r(x) ß repeat for each core router that is    

                                                route reflector except the local one

[cadet alain]

Hi,

neighbor x.x.x.x peer-group RRCLIENTS *************? is this incorrect? should it be RR_CLIENTS.  

Yes We can suppose it is RR_CLIENTS

no synchronization

http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a00800949e8.shtml#nineteen

bgp dampening  10 2000 4000 30 *************? 

dampening is used to prevent flapping routes from updating BGP RIB and thus bring instability:

http://www.cisco.com/en/US/docs/ios/12_2/iproute/command/reference/1rfbgp1.html#wp1017894

neighbor RR_CLIENTS send-community *************?     

By default routers don't send the community attribute   http://www.networkers-online.com/blog/2008/09/understanding-bgp-communities/

neighbor DIST_ROUTERS peer-group *************?       

configure a peer-group named DIST_ROUTERS   http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093fb7.shtml

Regards.

Alain.