Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Fistly I am not a Cisco certified person but unfortunately i have to configure a Cisco router. I am trying to configure multicasting with GRE over IPSec and I am stuck because my router ignores ip pim sparse mode commands. I put ip multicast-routing somewhere in the config file. My model is 881-k9, I couldn't find on the internet clear specification wheather it supports or not. Please assist. Thanks !

share|improve this question
up vote 1 down vote accepted

This may be a licensing issue based upon the information I found on the Cisco support forum.

share|improve this answer
You are right. We had to buy licence to activate this functionality. – Iuliu Atudosiei Jun 15 '12 at 9:35

Ok, I´m quite impressed... a non-cisco person going for a PIM over GRE?

Anyways, enable the PIM first (in the global config mode): ip multicast-routing

then go to the Tunnel interface config t int Tunnel0

and try the "ip pim sparse-dense-mode" command

if it doesnt take it - no support on your 881, sorry.

Hope this helps.

share|improve this answer
Thanks, It's all working fine now :) The license was missing. – Iuliu Atudosiei May 10 '13 at 9:14

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.