BGP Dual AS behavior

From: ciscozest (ciscozest@gmail.com)
Date: Wed Feb 18 2009 - 04:52:54 ARST

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To all BGP guru,
There are two BGP AS#: AS 7440 and AS 7449 connected each other.

Topology:

R1 (PE) --- R2(P) ---- R3(ASBR) ---- R7 (ASBR)---- R8(P) ---- R9(PE)

R1, R2 and R3 are in AS#7440, the others are in AS 7449.

After I configure R7 for BGP Dual AS support, I can not traceroute to R9
from R1 or R3 anymore but I can ping it. Is this behavor normal? I saw on R9
that traffic to AS#7440 is via R7 but through AS#7440 direct in BGP table
which seems to be the cause.
Can someone tell me if this is expected with BGP dual AS config?

Thanks,

Blogs and organic groups at http://www.ccie.net

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