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Multicast with hsrp

Here is the design

core 1 is at location A which consists 2 6509's running hsrp for roughly 20 vlans..

core 2 is at location B which consists of 2 6509's running HSRP for roughly 30 vlans.

Location A and B are connected via 1 WAN link.

With multicast running are there anything to take into consideration when implimenting multicast, that would be out of the ordinary due to HSRP. Will be using BSR with sparse mode only.

11 REPLIES
Cisco Employee

Re: Multicast with hsrp

Hi,

Multicast packets generated by HSRP are local scope only so you don't have to worry.

HTH

Laurent.

Bronze

Re: Multicast with hsrp

When using multicast in an HSRP environment, care must be used in configuring multicast with the physical IP address as opposed to the HSRP logical address as the IP Address. If the HSRP address is used, multicast traffic will not be sent. Why Doesn't PIM Sparse Mode Work with a Static Route to an HSRP Address

http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080094aab.shtml

New Member

Re: Multicast with hsrp

Thanks. I was thinking of adding a Loopback on the switches for the RP. So it doesnt look i will have a problem. Thanks guys.

Bronze

Multicast with hsrp

I've just recently run into the exact same issue.  I configured an Mroute to the physical IP of one of the routers in the HSRP group and it works.  I attempt it to HSRP doesn't work.  Re-configure to the other physical IP and works fine.  Contacted TAC, they looked through my configs and said everything is configured appropriately, just not an option in my particular design.

Not sure how this works with respect to redundancy, however I'm assuming it's a manual process to fail over.  Unless someone else has found a solution I'm not aware of.

Hope this helps, the article previously mentioned is the right answer.

JB

Re: Multicast with hsrp

Anycast RP with MSDP will address all requirements.

Bronze

Re: Multicast with hsrp

Please explain.

Re: Multicast with hsrp

Bronze

Re: Multicast with hsrp

  Not sure that applies here.  I have a single source from a provider.  I have two ethernet ports handed to me running HSRP.  The issue that I see is I'm not sending my request upstream to the RP as I don't have a PIM neighbor with my provider's HSRP address.  Literally the provider is on one VLAN, my client is on another.  3750 stack, no ACLs or anthing, pim sparse mode on both interfaces, etc.

Re: Multicast with hsrp

Ahh OK, sorry my error in understanding  - have you enabled PIM on the VLAN SVI interfaces?

Bronze

Re: Multicast with hsrp

PIM is enabled on both SVIs.  Like I said it works if I configure a static MRoute to either physical IP, but not if I use my HSRP address.  The article http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080094aab.shtml explains it perfectly, I just wish there was a way around it.

Re: Multicast with hsrp

The issue is RPF failure - caused by HSRP and a default IP static route.

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