Multicast packet processing

[Amol Ghugare]

Hi

can anyone give me guidance on Multicast packet processing on 6509 with SUP720 ?

How it processed, like software queue or Hardware queue ?

What are the pors and cons for both ?

[Joseph W. Doherty]

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I believe it's done within the hardware, with replication being done upon ingress, if possible.  If done upon ingress it's possible such replication can overload the card's ingress to the chassis.

[Amol Ghugare]

Hi Joseph,

Thank you for the answer, however i am seeing one unwanted logs on my device its 6509E device with SUP720.

"MLSM[2]: mlsm_process_pending_event ERROR in processing"

Could this be the cause for Hardware queue over utilization  ?

[Akash Agrawal]

Hi Amol,

Are you running MVPN extranet. You may see mentioned error in case of unsupported config.

If yes, please check if we are meeting below conditions to run MVPN extranet.

Restrictions for Configuring Multicast VPN Extranet Support

•The Multicast VPN Extranet Support feature only supports Protocol Independent Multicast (PIM) sparse mode (PIM-SM) and Source Specific Multicast (SSM) traffic; PIM dense mode (PIM-DM) and bidirectional PIM (bidir-PIM) traffic are not supported.

•When configuring extranet MVPNs in a PIM-SM environment, the source and the rendezvous point (RP) must reside in the same site of the MVPN behind the same provider edge (PE) router.

Regards,

Akash

[Amol Ghugare]

Hi Akash,

Thank you for your input, this is what i have got from  Cisco TAC.

My point here is that when I am having this kind of configuration, whats its implication on my device ? will it trigger any issue with memory on my device ?

[Akash Agrawal · Accepted solution]

Hi Amol,

When you are having an unsupported config on router, you may see unexpected results. IOS is not designed to handle such config. You may see router crash as well. 

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Regards,

Akash