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Interface: se-0/0/3.0<br />

Querier: 10.0.16.1<br />

State: Up Timeout: None Version: 2 Groups: 0<br />

Interface: se-0/0/2.0<br />

Querier: 10.0.21.1<br />

State: Up Timeout: None Version: 2 Groups: 0<br />

Configured Parameters:<br />

IGMP Query Interval: 125.0<br />

IGMP Query Response Interval: 10.0<br />

IGMP Last Member Query Interval: 1.0<br />

IGMP Robustness Count: 2<br />

Derived Parameters:<br />

IGMP Membership Timeout: 260.0<br />

IGMP Other Querier Present Timeout: 255.0<br />

You see that without even configuring IGMP, it is running on the same three network<br />

interfaces as PIM-SM. For each interface, the State shows that IGMP is Up and<br />

operational and that the IGMP is Version 2. Because this recipe has not modified any<br />

of the default IGMP settings, the Configured Parameters section of the output shows<br />

the default JUNOS values of IGMP group membership parameters, which match the<br />

defaults specified in RFC 2236.<br />

After configuring PIM on the other routers in the network, check again to see<br />

whether the router has located any PIM neighbors. You can check for PIM neighbors<br />

directly:<br />

aviva@RouterA> show pim neighbors<br />

Instance: PIM.master<br />

Interface IP V Mode Option Uptime Neighbor addr<br />

fe-0/0/1.0 4 2 HPLG 5d 18:12:41 10.0.15.1<br />

se-0/0/2.0 4 2 HPLG 5d 18:12:41 10.0.21.2<br />

se-0/0/3.0 4 2 HPLG 4d 23:56:38 10.0.16.2<br />

The three PIM-enabled interfaces each connect to one PIM neighbor. fe-0/0/1 connects<br />

to RouterE, se-0/0/2 to RouterB, and se-0/0/3 to RouterG.<br />

Once you have configured PIM neighbors, the routers join IGMP groups:<br />

aviva@RouterA> show igmp interface<br />

Interface: fe-0/0/1.0<br />

Querier: 10.0.15.1<br />

State: Up Timeout: 180 Version: 2 Groups: 4<br />

Interface: se-0/0/3.0<br />

Querier: 10.0.16.1<br />

State: Up Timeout: None Version: 2 Groups: 4<br />

Interface: se-0/0/2.0<br />

Querier: 10.0.21.1<br />

State: Up Timeout: None Version: 2 Groups: 4<br />

Configured Parameters:<br />

IGMP Query Interval: 125.0<br />

IGMP Query Response Interval: 10.0<br />

582 | 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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