[c-nsp] SSO on 65 support mcast?

[christian.macnevin at uk.bnpparibas.com]

Ok, this from 
http://www.cisco.com/en/US/customer/products/hw/switches/ps708/products_white_paper0900aecd801c5cd7.shtml 
:

 "MMLS NSF with SSO enables the system to maintain multicast forwarding 
state in the PFC3 and DFC3 hardware during a supervisor-engine switchover, 
minimizing multicast service interruption. Prior to MMLS NSF with SSO, the 
multicast forwarding entries were not synchronized to the standby 
supervisor engine. The NSF with SSO switchover time is 0 to 3 seconds for 
Layer 2-4 unicast or multicast traffic."

The 'maintain multicast forwarding state' makes it sound like it's normal 
NSF, with 0 to 3 seconds before the table's recalculated and verified by 
the new master. Is my understanding flawed here? And if so, then what 
failover time am I expecting with PIM-SM and IGMPv2 on default timers?

Also, if you're aware, what's the likely difference between this and the 
3750's implementation of NSF? I realise that's only capable of RPR+, 
meaning any routing updates should be ignored for 30-60 seconds, but does 
it (also?) experience outage with the mcast forwarding table?

Thanks (hopefully)
Christian





Internet
tstevens at cisco.com
28/09/2005 21:27

To
Christian MACNEVIN, cisco-nsp
cc

Subject
Re: [c-nsp] SSO on 65 support mcast?






Multicast is supported for SSO in 18SXD and later. It is a "single
box" solution - NOT like NSF for unicast. There are no triggered PIM
joins or other interbox facilities associated with it. Also, there is
a "hold time" after the switchover where any new multicast streams
will be switched by software not hardware (existing streams continue
getting h/w switching, and host joins/leaves are still processed via
igmp snooping).

The feature name is "MMLS NSF/SSO". Don't let the "NSF" part fool you
though, per the above.

Tim

At 02:21 AM 9/28/2005, christian.macnevin at uk.bnpparibas.com pronounced:
>Hi,
>Is anyone aware of a feature support matrix for SSO on the 6500? The
>reason I ask is that I was forced to use RPR+ to support MPLS switchover
>roughly a year ago, so I'm not sure how fully implemented the feature is.
>It's multicast I'm worried about this time round.
>Cheers
>Christian.
>
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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This message and any attachments (the "message") is 
intended solely for the addressees and is confidential. 
If you receive this message in error, please delete it and 
immediately notify the sender. Any use not in accord with
its purpose, any dissemination or disclosure, either whole 
or partial, is prohibited except formal approval. The internet 
can not guarantee the integrity of this message. 
BNP PARIBAS (and its subsidiaries) shall (will) not 
therefore be liable for the message if modified. 

**********************************************************************************************

BNP Paribas Private Bank London Branch is authorised 
by CECEI & AMF and is regulated by the Financial Services
Authority for the conduct of its investment business in the
United Kingdom.

BNP Paribas Securities Services London Branch is authorised
by CECEI & AMF and is regulated by the Financial Services
Authority for the conduct of its investment business in the 
United Kingdom.
  
BNP Paribas Fund Services UK Limited is authorised and 
regulated by the Financial Services Authority.