[c-nsp] HSRP Groups on ASR1k

[Benjamin Lovell]

I haven't looked into this on the ASR1K but what the message is telling you is that the NIC can only program 28 MAC addresses and you have used up the limit. If you add more sub-interfaces with HSRP then bad things will start to happen. Drops, punt to CPU, not sure as I have not looked into it on this platform but nothing good. 

This could be a software limitation that was addressed or is planed to be addressed in later code releases or it could be a hard limit of the NIC used on the SPAs. I would open a case with the TAC to have them talk to the devs about this and see if it will be important to you. 

BTW - not clear on the part where you said you are using HSRP groups 1 and 2 on the customer sub-ints. You should use a unique standby group for each HSRP instance. If you are not this *may have something to do with your problem.

-Ben


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          .            .          Benjamin Lovell
          |            |          AS Video Practice
         |||          |||         Cisco Customer Advocacy
       .|||||.      .|||||.       Research Triangle Park, NC
    .:|||||||||:..:|||||||||:.    Email:  belovell at cisco.com
             cisco            desk:919.392.8255 cell:203.509.1562
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On Sep 28, 2010, at 12:10 PM, Matthew Melbourne wrote:

> Has anyone seen this informational message on an ASR1002 (running IOS XE 3.1S):
> 
> ASR1-A(config)# interface Port-Channel 6.415
> ASR1-A(config-subif)# encapsulation dot1Q 415
> ASR1-A(config-subif)# ip address 10.96.24.2 255.255.254.0
> ASR1-A(config-subif)# ip access-group CUST-IN in
> ASR1-A(config-subif)# ip nat inside
> ASR1-A(config-subif)# ip virtual-reassembly
> ASR1-A(config-subif)# standby 1 ip 10.96.24.1
> % Warning: Interface MAC address filter only supports 28 additional addresses
> % and 28 HSRP groups are already configured.  The HSRP MAC address may not be
> % added to the MAC address filter if the group becomes active.
> 
> We are using Standby groups 1 and 2 on each customer sub-interface on
> the Port-Channel, which provide FHRP between a pair of ASRs.
> 
> Is this a likely to be an issue as more sub-interfaces are added?
> 
> Cheers,
> 
> Matt
> 
> -- 
> Matthew Melbourne
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