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FTOS Configuration Guide for the C-Series - Force10 Networks

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To trace a multicast route use <strong>the</strong> command mtrace.<br />

Figure 448 Tracing a Multicast Route<br />

<strong>Force10</strong>#mtrace 165.87.33.6 165.87.30.5 225.1.2.1<br />

Type Ctrl-C to abort.<br />

Mtrace from 165.87.33.6 to 165.87.30.5 via group 225.1.2.1<br />

From source (?) to destination (?)<br />

Querying full reverse path...<br />

0 165.87.30.5<br />

-1 165.87.3.5 PIM [165.87.33.0/24]<br />

-2 165.87.3.2 PIM [165.87.33.0/24]<br />

-3 165.87.5.5 PIM [165.87.33.0/24]<br />

-4 165.87.33.6<br />

PIM Source Specific Multicast<br />

PIM Source Specific Multicast is supported only on plat<strong>for</strong>m e<br />

The PIM-SSM protocol <strong>for</strong> IPv4 and IPv6 is based on <strong>the</strong> source specific model <strong>for</strong> <strong>for</strong>warding multicast<br />

traffic across multiple domains in <strong>the</strong> Internet. It is restricted to shortest path trees to specific sources<br />

described by hosts using IGMPv3.<br />

PIM-SSM is a subset of PIM-SM and shares with it <strong>the</strong> ability to join SPTs. However, unlike PIM-SM,<br />

PIM-SSM’s register states and shared tree states <strong>for</strong> multicast groups in <strong>the</strong> SSM range are not maintained.<br />

End-hosts use IGMPv3 to register <strong>the</strong>ir interest in a particular source-group (S,G) pair. PIM-SSM interacts<br />

with IGMPv3 to construct <strong>the</strong> multicast <strong>for</strong>warding tree rooted at <strong>the</strong> source S.<br />

Important Points to Remember<br />

• The default SSM range is 232/8 and ff3x/32.<br />

• Only standard ACLs are supported. Extended ACLs cannot be used <strong>for</strong> configuring SSM range.<br />

• Ensure you configure <strong>the</strong> ACL first and <strong>the</strong>n apply it to <strong>the</strong> SSM range.<br />

• Applying an SSM range with an ACL overwrites <strong>the</strong> default range. To have both <strong>the</strong> default range and<br />

<strong>the</strong> SSM range be effective, add <strong>the</strong> default range to <strong>the</strong> SSM ACL.<br />

• The default range is always supported. The range can never be smaller than <strong>the</strong> default.<br />

Configuring and Verifying PIM-SSM<br />

PIM-SSM supports a configurable SSM group range using an ACL. To configure an SSM group, use <strong>the</strong><br />

command [no] {ip | ipv6} pim ssm range access-list<br />

To display which non-default groups have been added to <strong>the</strong> PIM SSM, use <strong>the</strong> command show ip pim<br />

smm-range.<br />

<strong>FTOS</strong> <strong>Configuration</strong> <strong>Guide</strong>, version 7.7.1.0 637

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