From: jongsoo.kim@intelsat.com
Date: Sun Aug 08 2004 - 13:26:16 GMT-3
Just my two cents on why EBGP peering w/ multihop, update source is not recommended.
In real ISP life, EBGP session with multihop = 255 and update source loopback can be really "dangerous" config as this can create all kind of problems( black hole, BGP session never being down when it supposed to be) specially if the customer's( the other bgp peer) loopback is reachable without bringing up the physical connection ( so customer has multi-homed and loopback address is reachable via the other ISP link as well).
It is only recommended for load-balance with ttl= 2 or whatever necessary minimum number. However, in a simplex satellite VSAT network commonly use eBGP w/ multihop=255 with a great caution.
Jongsoo
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