As a result of an off-list conversation, I came across the following
networking term:
iBGP split horizon
my first reaction was a sarcastic remark about never having come across the
term in the RFC's. but then I got to thinking about it, and I now see this
as a descriptive and quite useful term.
recall that distance vector protocols are subject to the rule of split
horizon. they do not advertise a route back out the interface that they
received that particular route.
one of the gotchas of iBGP is the fact that iBGP routers do not propagate
routes learned from one iBGP neighbor to other iBGP neighbors. hence the
requirement for iBGP full mesh.
so why not call this iBGP split horizon? and define it as follows: an iBGP
router will not advertise a route back out the same AS from which it learned
the route?
does this make sense? worth letting this one join the lexicon of networking
terminology?
Chuck
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=16668&t=16668
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