[c-nsp] MLPPP and ip load-sharing per-packet

[Brian Turnbow]

I didn't follow this whole thread, but
 A router using MPLS ( tag-switching) that recieves a tagged packet,
doesn't look at the IP information but makes forwarding decisions based
on the label(tag). Ok before I get hammered there are cases where a
router removes a tag and does IP forwarding, but it does not seem to be
your case. 
You can try to use MPLS to manage this traffic by using traffic
engineering and/or diff-serv tunneling. There are examples of both on
the web site.

Hope it helps
Brian
-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jon Lewis
Sent: sabato 22 ottobre 2005 2.14
To: Rodney Dunn
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] MLPPP and ip load-sharing per-packet

On Tue, 11 Oct 2005, Rodney Dunn wrote:

> We don't support MPLS over a MLPPP bundle on all codes.

I'm still fighting with our routers trying to get this customer's VOIP 
traffic routed over a "dedicated" circuit.  No matter what I've tried, I

just can't seem to do it.  The logical conclusion appears to be 
tag-switching "breaks IP routing", at least in 12.2.14S3.

i.e. packets received on an interface doing tag-switching cannot be 
rerouted using either policy routing (to route based on source IP) or
even 
simple static routing.  i.e.  On the 7206 closer to our core (routerO), 
traffic comes in via DS3s to our core doing tag-switching.  I've set
aside 
1 of the many T1's connecting routerO to a remote POP 7206 (routerL). 
Even if I static route the customer's VOIP server's /32 on routerO to
the 
routerL IP on the dedicated T1 interface, traffic to that /32 continues
to 
tag the tag-switched path (across the other T1s) to routerL.  Traffic 
generated on routerL to the customer's staticly routed /32 takes the 
configured dedicated T1 path.

Is this expected behavior?  If so, is there any way we can have just the

traffic that needs it (MPLS VPN traffic) tag-switched, and all other 
traffic IP routed?

Is it possible that an upgrade, say to 12.3 mainline will allow IP
routing 
(either policy or static) to override tag-switching?

----------------------------------------------------------------------
  Jon Lewis                   |  I route
  Senior Network Engineer     |  therefore you are
  Atlantic Net                | 
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
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