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Cell Relay Retreat>MPLS-OPS Archive>month:2002-Feb> msg00115



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Re: Exp bits with cisco box and VPNs

  • From: Christopher Lewis <chrlewis@cisco.com>
  • Date: Sat, 16 Feb 2002 11:34:56 -0600
  • Cc: mpls-ops@mplsrc.com
  • Resent-Date: Sat, 16 Feb 2002 13:04:20 -0500
  • To: Yves@Fauser.de
  • X-Sender: chrlewis@fargo.cisco.com

Hi,

First, a PE using IOS forwarding does copy IP Prec to EXP in both labels(VPN label and IGP label) by default.

Second, if we use CB-Marking to change EXP on PE input, the exp value is copied to both labels.

Chris

At 11:02 AM 2/16/2002, Yves@Fauser.de wrote:

Hi folks,

I have some trouble to find informations about this topic.
I'm marking the packets on the egress PE  on an Interfaces that is in a VRF with the commands "match input interface" in a class map, and "set mpls experimental" in the policy map, then I apply this to the policy to the input interface. example :

class-map VPN_A
  match input interface GigabitEthernet1/1

policy-map VPN_PMAP
  class VPN_A
      set mpls experimental 3

interface GigbitEthernet1/1
  ip vrf forwarding vrf1
  service-policy input VPN_PMAP

I asume that this will set the exp fields bottom label stack entry ? How will the next P box be able to read the Exp bits ? Is the Exp field of the bottom label stack entry copied into the top label stack entry ?

Thanks for your help,
Yves