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Address family INET<br />

RP address Type Holdtime Timeout Active groups Group prefixes<br />

192.168.13.1 auto-rp 150 150 2 224.0.0.0/4<br />

192.168.19.1 static 0 None 0 224.0.0.0/4<br />

When RouterA goes down, RouterG become the RP:<br />

aviva@RouterG> show pim rps inet<br />

Instance: PIM.master<br />

Address family INET<br />

RP address Type Holdtime Timeout Active groups Group prefixes<br />

192.168.19.1 auto-rp 150 150 2 224.0.0.0/4<br />

192.168.19.1 static 0 None 2 224.0.0.0/4<br />

If you don’t want the same PIM router to perform both the RP announcement and<br />

group mapping functions, configure one router to announce (as we did with RouterG<br />

above) and configure another one to map:<br />

[edit protocols pim]<br />

aviva@RouterE# set rp auto-rp mapping<br />

After all routers are running auto-RP, look at the PIM interfaces on the routers. First,<br />

look at the RP router:<br />

aviva@RouterA> show pim interfaces<br />

Instance: PIM.master<br />

Name Stat Mode IP V State Count DR address<br />

fe-0/0/0.0 Up SparseDense 4 2 NotDR 2 172.19.121.115<br />

fe-0/0/1.0 Up SparseDense 4 2 DR 1 10.0.15.2<br />

lo0.0 Up SparseDense 4 2 DR 0 192.168.13.1<br />

pd-0/0/0.32769 Up Sparse 4 2 P2P 0<br />

se-0/0/2.0 Up SparseDense 4 2 P2P 1<br />

se-0/0/3.0 Up SparseDense 4 2 P2P 0<br />

Then, look at one of the non-RP routers:<br />

aviva@RouterE> show pim interfaces<br />

Instance: PIM.master<br />

Name Stat Mode IP V State Count DR address<br />

fe-0/0/0.0 Up SparseDense 4 2 NotDR 3 172.19.121.119<br />

fe-0/0/1.0 Up SparseDense 4 2 NotDR 1 10.0.15.2<br />

lo0.0 Up SparseDense 4 2 DR 0 192.168.15.1<br />

pe-0/0/0.32770 Up Sparse 4 2 P2P 0<br />

t1-0/0/3.0 Up SparseDense 4 2 P2P 0<br />

On both routers, you see that all the physical interfaces are running PIM in sparsedense<br />

mode. You also see two new interfaces, pd-0/0/0 on the RP and pe-0/0/0 on<br />

the non-RP. pd stands for n and pe for PIM encapsulation, and they are interfaces on<br />

the tunnel, AS, or link services PICs that handle PIM Register messages. PIM Register<br />

messages use these two interfaces to encapsulate and de-encapsulate data packets.<br />

PIM-SM RPs create pd interfaces so they can remove multicast data from PIM<br />

Register messages, and PIM-SM routers that see a local multicast source on one of<br />

their interfaces use pe interfaces to send Register messages.<br />

588 | Chapter 16: IP Multicast<br />

This is the Title of the Book, eMatter Edition<br />

Copyright © 2008 O’Reilly & Associates, Inc. All rights reserved.

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