From: Mahesh Shivaswamy (maheshs.cisco@gmail.com)
Date: Sat Feb 16 2008 - 09:59:45 ARST
Hi All,
In Lab 16 Sec 4.1, there is a FR Hub & Spoke with R3 as Hub & R4/5 as
Spokes.
R3, R4, R5 are peering with each other on Serial IP & I see the neighbor
between R3 & R4 is coming up as expected with the neighbor cmd &
the strange thing I noticed is the neighbor between R3 & R5 is not in
openconfirm state, but once I added the cmd <ebgp-multihop> the neighbor's
are up. This is not an expected behaviour as ebgp-multihop is used on
indirectly connected peers, the following is the configs
R3
neighbor 154.1.0.4 remote-as 400
neighbor 154.1.0.5 remote-as 400
neighbor 154.1.0.5 ebgp-multihop
R4
neighbor 154.1.0.13remote-as 300
R5
neighbor 154.1.0.3 remote-as 300
neighbor 154.1.0.3 ebgp-multihop
Its strange I see this cmd in SOLUTION as well & the best part is the
neighbor came up after configuring this cmd :-)
Can some one help me understand why do I need this cmd <ebgp-multihop> to
only one spoke on a FR hub & spoke
topology for bgp neighborship establishment.
rgds
Mahesh
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