[c-nsp] Multicast over VRF possible?

Douglas C. Stephens stephens at ameslab.gov
Wed May 27 22:48:06 EDT 2009


I've successfully used "ip pim sparse-mode" on SVIs assigned to VRF-lite
contexts on all my 6500s.  This was on Sup720+MSFC3+PFC3B blades running
both ADVENTERPRISEK9_WAN-M and ADVIPSERVICESK9_WAN-M feature sets of the
12.2(18)SXF release.

I've not run into this problem on my 4500 switches, but then I'm running
them with SupV blades, and I've not yet had much call for VRF-lite there.

At 07:54 PM 5/27/2009, Jeff Kell wrote:
>In the process of an upgrade/reconfiguration today, I discovered 
>that PIM multicast routing and VRF-lite are apparently mutually 
>exclusive on a 4506.  In this case, specifically IOS 
>cat4500-entservicesk9-mz.122-50.SG1 on a Sup-IV  WS-X4515.
>With an "ip vrf forwarding ..." directive, there is no "ip pim" 
>option available, it disappears from the configuration options.
>OK, that was the "old school" fix to make some limited multicast 
>work in this situation (Symantec Ghost for imaging remote labs).
>Is there another way to achieve routed multicasting in a VRF 
>environment?  Specifically, the imaging server resides in a "public 
>services" VRF, while the target labs are in other VRFs.
>Is this a platform-specific restriction?  Or is it 
>Catalyst-wide?  Can the 6500 handle it (on a 'ip vrf forward'ed 
>interface or SVI)?
>There are some imaging alternatives (just relocate a suitable 
>"master" copy to the local subnet), but there are some other 
>multicast "plans" on the table that aren't so easily bypassed.
>Thanks in advance,
>cisco-nsp mailing list  cisco-nsp at puck.nether.net
>archive at http://puck.nether.net/pipermail/cisco-nsp/

Douglas C. Stephens             | UNIX/Windows/Email Admin
System Support Specialist       | Network/DNS Admin
Information Systems             | Phone: (515) 294-6102
Ames Laboratory, US DOE         | Email: stephens at ameslab.gov 

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