Re: eBGP Neighbors

From: Bill.McKenzie@bisys.com
Date: Wed Jun 21 2006 - 11:00:39 ART

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If the BB router thinks you are in a different AS than you are, that could
keep you from peering.

Bill McKenzie
Network Support
BISYS Fund Services
Work: 614.428.3293
Cell: 614.425.2370

"Exceeding Client Expectations"

                                                                           
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             06/21/2006 09:57 eBGP Neighbors
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Hello,

I just finish an online lab. I had trouble with getting an eBGP neighbor to
come up. It was a BB router, so I didn't have access to see the config. Any
who... I was recieving RIP updates for it. It was directly connected, on
the same vlan, and I could ping it.

I tried the following and still didn't work...

- used the ebgp 255 (just incase it was further than I thought)

- used the update loopback0 (just incase it was peering to my loopback)

- and stripped it down to just basics on the router...
       (meaning, didn't have any confederations or anything... just the AS
it was going to peer with)

Then I turned on all debugging for BGP...

The only message I could get was "connection refused from remote" or
something like that...

Then I turned on debug ip packet detail... to see if I was recieving any
packets via TCP port 179... and I wasn't... all I saw from the backbone
router was rip updates via 224.0.0.9.

Then I the only last thing I could think that could prevent updates... was
an ACL... I looked at the whole path... no ACLs anywhere...

So what else could prevent eBGP neighbors from forming?

Thanks,

Daniel Fredrick

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