BGP - Admin distance - Please help

From: Paul Chen (cpjchen@starhub.net.sg)
Date: Sat Oct 18 2003 - 06:52:54 GMT-3


Hi Everyone.

I was wondering if someone is kind enough to explain the the following
scenario that I have:

R7

|

|

R5 --------------------R9

                          |

                        R6

R7 is a EBGP neighbor of R5 . R5 and R6 are route-reflector clients of R9.

R5 learns network 207 from R7 - on the routing table of R5 network 207 has
a admin distance of EBGP which is 20.

At R9 BGP is redistributed into OSPF - the admin distance of network 207 is
now 200.-

Q1. Having redistributed BGP into OSPF, why does BGP still get installed
into the routing table with a admin distance of 200 instead of showing up as
a OSPF route ?

At R6 - network 207 is now a OSPF E route with a admin distance of 110 -

Q2.. Why is it that changing the admin distance to a number lower than 110
does not bring BGP into the routing table ?

However, changing the admin distance a number 200 or higher for network
207, will get a iBGP route installed with a admin distance of 200.

Any help appreciated.

Thanks.

Paul



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