BGP peering

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Jun 2nd, 2009
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Question. Best practice is to configure iBGP via loopback interface. My question is, is that valid statement for scenario where two BGP peers are seperated by a firewall?

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rais Tue, 06/02/2009 - 07:43
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For iBGP peering, the FW shouldn't matter. Loopbacks can still be used.

Some FW support bgp themselves, so they can be part of iBGP.


Giuseppe Larosa Sun, 06/07/2009 - 12:12
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Hello Mateuz,

iBGP allows for a TTL=255 in the BGP packets so the added hop caused by the firewall is not a problem for the iBGP session.

if the session were eBGP you would need to tune the ebgp-multihop to take care of the FW hop.

Hope to help



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