At 08:43 AM 9/17/2013 Tuesday, Yuri Bank noted:
Hi Tim,
Thanks for your response.
I should have phrased my question differently. I'm not suggesting
that FP IS-IS actually interacts with PIM-SM directly.
My question is: Will the FP device, which is running PIM-SM on some
SVI, send PIM Register/Join messages for learned multicast
sources/receivers in the FP domain?
Yes, absolutely.
Imagine the following scenario.
You have DeviceA and DeviceB.
DeviceA is a FP switch, with an entire FP domain behind it.
DeviceB is a legacy multilayer switch, or router, with many other L3
devices behind it.
DeviceA has an FP-VLAN with a PIM-SM enabled SVI in it.
DeviceB simply has a layer3 interface (in the above vlan) with PIM-SM enabled.
Now the RP, sits somewhere behind DeviceB. Obviously, if there is a
host somewhere in the FP network that starts sending multicast
traffic, DeviceA will have to send out a PIM-Register message in
order for the RP to learn of the source(otherwise, only hosts in the
FP network would be able to listen to that traffic).
Yes, the FP switch with the SVI will attract the multicast traffic
(learned as an mrouter) and once that traffic hits the SVI all the
usual first hop router mechanisms for L3 multicast kick in.
Likewise, if there is a multicast receiver in FP network, a PIM-Join
message would need to make its way to the RP.
IGMP snooping intercepts the join at the edge switch to track state
on the edge port. That join will be flooded on the mrouter ports (and
also handed over to FP ISIS to advertise the edge switch's interest
in that group in FP via GM-LSPs.) Once the join hits the SVI all the
usual last hop router mechansims kick in.
Tim
Does this make sense? Again, I greatly appreciate your response.
-Yuri Bank
On Tue, Sep 17, 2013 at 9:46 AM, Tim Stevenson
<<mailto:tstev...@cisco.com>tstev...@cisco.com> wrote:
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, tstev...@cisco.com
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IP Phone: 408-526-6759
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