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

[Rodney Dunn]

Sorry for the late reply and I'm not sure I follow you without
a diagram and the configuration but here goes..

If a packet comes in MPLS (with tags) and there is a label
to be swapped out another interface you can not reroute that
packet based on IP. It's being MPLS switched.

You would have to prevent the upstream from sending an MPLS
packet but rather have it send it IP so the IP features
on the downstream router work on the packet.

ie: We don't have MPLS support based on tags with PBR.


On Fri, Oct 21, 2005 at 08:13:46PM -0400, Jon Lewis wrote:
> 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                | 
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