[149494] in North American Network Operators' Group
Re: Optimal IPv6 router
daemon@ATHENA.MIT.EDU (Leo Bicknell)
Mon Feb 6 09:19:50 2012
Date: Mon, 6 Feb 2012 06:18:46 -0800
From: Leo Bicknell <bicknell@ufp.org>
To: nanog@nanog.org
Mail-Followup-To: nanog@nanog.org
In-Reply-To: <20120206073426.GB8779@srv03.cluenet.de>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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In a message written on Mon, Feb 06, 2012 at 08:34:26AM +0100, Daniel Roese=
n wrote:
> itself is completely AFI-agnostic - see e.g. IOS/IOS-XE [can't comment
> on XR]).
IOS-XR is fully AFI-agnostic, as far as I can tell. It also updated
the CLI to be consistently "ipv4 ..." or "ipv6 ..." with similar
syntax. I think also that all of the platforms on which IOS-XR
runs (GSR, CRS-1/3, ASR9000) can all run full line rate IPv6 in
hardware, with features.
While much of the IOS-XR vrs JunOS is personal preference, IOS-XR has
one very cool feature. You can pass parameters in route policy. Many
networks maintain slightly different versions of policies like
"peer-in/peer-out" due to various load balancing or preference needs,
with a 5-15 stanza policy repeated over and over. When you have to
update one of the stanzas in all policies it becomes a big mess.
In IOS-XR, you can write a generic policy and then call with with
parameters:
route-policy generic-out($routeCommunity)
... ! Do all the common things
if community matches-any $routeCommunity then
accept
endif
drop
end-policy
community-set send-to-private-peers
1234:5678
end-set
route-policy private-peer-out
apply generic-out(send-to-private-peers)
end-policy
community-set send-to-public-peers
1234:4321
end-set
route-policy public-peer-out
apply generic-out(send-to-public-peers)
end-policy
With a little bit of careful thought you can really collapse down the
policy to be much shorter, easier to understand, and have almost no
cut-and-paste in it, which should reduce errors when updating in the
future.
--=20
Leo Bicknell - bicknell@ufp.org - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/
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