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BGP Neighbor on serial IP with ebgp-multihop option
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 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 to only one spoke on a FR hub & spoke topology for bgp neighborship establishment.
rgds Mahesh
