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Cell Relay Retreat>MPLS-OPS Archive>month:2004-Sep> msg00130



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Re: IP Routing problem after enabling MPLS?

  • From: sthaug@nethelp.no
  • Date: Sat, 18 Sep 2004 23:05:53 +0200
  • Cc: mpls-ops@mplsrc.com
  • Resent-Date: Sat, 18 Sep 2004 17:28:40 -0400

> > use a lower IP MTU in your network (ensuring there is room for at least
> > two labels, preferably a bit more), or you can use interface types that
> 
> How does this help me with the packet transfer? Where would I set it 
> lower in order to fix the problem? Setting it on both sides of the 
> ethernet bridge didn't help me any (set "ip mtu" to 1488) ... should I 
> instead set the MTU to 1488 on our uplink/peering interfaces?

With "ip mtu 1492" on all FE links, including uplink/peering, you know
that you have room for two labels. You may also be able to increase the
MPLS MTU ("tag-switching mtu ...") as another poster mentioned.

Steinar Haug, Nethelp consulting, sthaug@nethelp.no

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