Team,
I am buffled....
This seems to be a fairly simple eBGP peering config but is NOT working. I am
sure I am missing something here. The stange thing is R6 can successfully peer
with R9 but can not peer with R7. And R7 is NOT peering with R6 (obvious) and
neither with R8. All these configs are eBGP just like R6<===>R9 that is
successful.
Here is the relevant config snapshot.
R6
R6 config when peering with R7 and R9.
router bgp 245
neighbor 100.0.0.9 remote-as 900
neighbor 100.0.0.9 ebgp-multihop 255
neighbor 100.0.0.9 update-source Loopback1
! This works just fine....
neighbor 100.0.0.7 remote-as 700
neighbor 100.0.0.7 ebgp-multihop 255
neighbor 100.0.0.7 update-source Loopback1
! Nop....
R7
...and R7 config when peering with R6 and R8
router bgp 700
neighbor 100.0.0.6 remote-as 245
neighbor 100.0.0.6 ebgp-multihop 255
neighbor 100.0.0.6 update-source Loopback1
! Nop...
neighbor 100.0.0.8 remote-as 800
neighbor 100.0.0.8 ebgp-multihop 255
neighbor 100.0.0.8 update-source Loopback1
! Nop...
R8
... and the ebgp config when R8 is peering with R7
router bgp 800
neighbor 100.0.0.7 remote-as 700
neighbor 100.0.0.7 ebgp-multihop 255
neighbor 100.0.0.7 update-source Loopback1
! of course Nop...
--------------------------------------------------------------------
... and finally R9 when peering with R6
router bgp 900
neighbor 100.0.0.6 remote-as 245
neighbor 100.0.0.6 ebgp-multihop 255
neighbor 100.0.0.6 update-source Loopback1
! This works just fine...
---------------------------------------------------------------------
I managed to get all these peering working fine by using physical interfaces
instead of loopbacks whenever I had issues. But the fact that I was not able to
have peering working through loopbacks bugs me and that is why I am asking for
help....and the fact that the Task requires R6 to use loopbacks when peering
with R7 suggests there is a catch on this set up...so I better clarify this. By
the way, the underlying TCP connections work fine.
Thanks
Bauke
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