mpls over gre on 6500

Unanswered Question
Feb 6th, 2008


Does 6500 support MPLS over GRE in hardware? I observe abnormal CPU utilization in my simple test lab (6500 with Sup720/pfc3b).This fact has discouraged me...


I have this problem too.
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didyap Tue, 02/12/2008 - 09:34

MPLS over GRE is not supported in Hardware for sup720. This is a PFC3 hardware limitation. Your options would be to use SPA-400 or Enhanced FlexWan.

Vasilii Mikhail... Mon, 05/25/2015 - 02:48

Hello. Sure this post is not an answer  for the question, but a small update.

MPLS over GRE support on 6500:

In 12.2 releases:

  • MPLSoGRE on 6500 is supported on SUP720 in hardware, only if CORE-facing interface is SIP-400/FlexWan card;
  • and it's supported in software on SUP720 itself (not clear starting of what release).


In 15.x releases:

  • support for SIP/SPA is deprecated;
  • MPLSoGRE in software is not supported any more (even though you may try a tweak with software switching due to "log" in ACL);
  • MPLSoGRE is supported in hardware with PFC4 (Sup2T).


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