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Old 11-17-2009, 10:14 PM
David.C David.C is offline
 
Join Date: May 2009
Posts: 118
Default How to enable BGP and make the neighbors most stable?


Preview Qmap: "BGP basis.qmap"


According to the figure above, configure R1-R4 with BGP routing, so that:

1. R3 and R4 are in AS 11, R1 and R2 are in AS 111.

2. Establish peering relationships as shown: blue arrow means iBGP, red arrow means for eBGP.

3. Each BGP router should start announcing routes to neighbor immediately without waiting for IGP protocol to learn of the same routes

4. Configure BGP in a way that its peering relationship is most stable
Attached Files
File Type: qmap BGP basis.qmap (56.4 KB, 2 views)

Last edited by David.C; 11-20-2009 at 06:06 AM.
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Old 11-17-2009, 10:18 PM
David.C David.C is offline
 
Join Date: May 2009
Posts: 118
Default Knowledge Points

Knowledge Points:
  • The source IP of BGP peering needs to be reachable from neighbor router. Use logical interface such as loopback as the source help increase the stability of BGP peering:
(config-router)#neighbor X.X.X.X update-sourceLoopback 0
  • When source IP of eBGP neighbors are not directly connected , e.g for R2 & R3, the following configuration is required:
(config-router)#neighbor X.X.X.X ebgp-multihop-hop (1~255)
  • BGP synchronization is enabled by default, which states that a BGP router will not advertise to eBGP neighbors for the routes learned from iBGP neighbors, unless those routes are also known via an IGP. To disable it, configure the following Cisco BGP subcommand:
(config-router)#no synchronization

Last edited by David.C; 11-20-2009 at 06:07 AM.
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