[c-nsp] Recommended 7206 12.2(x)SB for MPLS?

[Mark Tinka]

On Wednesday 19 September 2007 02:06, Vinny Abello wrote:

> I know we're up to SB9 last I
> checked, but I haven't tested that yet. On SB6, when I
> started configuring "mpls ip" and "mpls traffic-eng
> tunnels" on interfaces with other routers and the LDP
> adjacency comes up, I notice a slight level of packet
> loss both to and through the router using that interface.
> I recall finding a bug on Cisco's web site (sorry, I
> don't have the ID handy) where having netflow enabled on
> an interface with MPLS IP enabled may prevent packets
> from being forwarded via CEF and I think SB6 is affected
> by that bug.

You also want to make sure the switch that router port is 
attached to supports a larger Ethernet MTU. Also, setting 
your MPLS MTU to at least 1526 (depending on whether you 
are doing vanilla MPLS or AToM as well, e.t.c.) would help.

I faced the same issue with a box connected to a 2950 
Catalyst switch (supports only 1500 bytes MTU) with MPLS 
enabled. Granted, I was running 12.3(20) at the time.

Cheers,

Mark.
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