3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring PIM Common Information 587
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CAUTION:
■ All the interfaces of the same router must work in the same PIM mode.
■ After PIM-SM is enabled on a VLAN interface, IGMP snooping cannot be
enabled in the VLAN corresponding to the VLAN interface, and vice versa.
Configuring the SSM
Group Range
As for whether the information from a multicast source is delivered to the
receivers based on the PIM-SSM model or the PIM-SM model, this depends on
whether the group address in the (S, G) channel subscribed by the receivers falls in
the SSM group range. All PIM-SM-enabled interfaces assume that multicast
groups within this address range are working in the SSM model.
Follow these steps to configure the SSM group range:
n
The commands introduced in this section are to be configured on all devices in the
PIM domain.
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CAUTION:
■ Make sure that the same SSM group range is configured on all devices in the
entire PIM-SM domain. Otherwise, multicast information cannot be delivered
through the SSM model.
■ If a multicast group falls in the PIM-SSM range and members of this group send
IGMPv1 or IGMPv2 joins, the device that receives these join messages will not
trigger (*, G) joins.
Configuring PIM
Common Information
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For the configuration tasks described in this section:
■ Configurations performed in PIM view are effective to all interfaces, while
configurations performed in interface view are effective to the current interface
only.
■ If the same function or parameter is configured in both PIM view and interface
view, the configuration performed in interface view is given priority, regardless
of the configuration sequence.
PIM Common
Information
Configuration Task List
Complete these tasks to configure PIM common information:
To do... Use the command... Remarks
Enter system view system-view -
Enter PIM view pim -
Configure the SSM group
range
ssm-policy acl-number Required
232.0.0.0/8 by default
Task Remarks
“Configuring a PIM Filter” on page 588 Optional
“Configuring PIM Hello Options” on page 589 Optional
“Configuring PIM Common Timers” on page 590 Optional