[c-nsp] FabricPath & PIM-SM Interoperation

[Tim Stevenson]

Hi Yuri, please see inline below:

At 03:27 AM 9/17/2013  Tuesday, Yuri Bank clamored:
>Hello fellow networking enthusiasts,
>
>I have a few specific questions concerning this:
>
>1. *Will a N7k/N5k translate GM-LSPs into PIM-Join messages, on a boundary
>link that has a remote peer running PIM-SM?


No. FP ISIS GM-LSPs are an L2 concept here, they basically track 
group membership state at L2 inside the FP core. FP ISIS would not 
"peer" with a router running PIM-SM; you would typically have an SVI 
enabled for the FP VLAN, and that would have PIM enabled to integrate to L3.


>2. *Same question as it relates to sources learned, that are within the
>FabricPath domain. Will PIM Register messages be generated, and sent to the
>RP in the PIM-SM domain?


Not without an SVI/router interface running PIM connected into the FP domain.



>3. *Any general information regarding this topic would be greatly
>appreciated, as I could find very little documentation about this.


Think of FP GM-LSPs as an extension of IGMP snooping. All the L3 
integration is basically the same in FP and classical Ethernet.


Hope that helps,
Tim




>Regards,
>
>YuriB
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Distinguished Technical Marketing Engineer, Cisco Nexus 7000
Cisco - http://www.cisco.com
IP Phone: 408-526-6759
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