3Com Switch 8800 Advanced Software V5 Configuration Guide

586 CHAPTER 42: PIM CONFIGURATION
n
To avoid forwarding failure, do not disable RPT-to-SPT switchover on a switch that
may become an RP (namely, a static RP or a C-RP).
Configuring PIM-SSM
n
The SSM module needs the support of IGMPv3. Therefore, be sure to enable
IGMPv3 on PIM devices with multicast receivers.
PIM-SSM Configuration
Task Li st
Complete these tasks to configure PIM-SSM:
Configuration
Prerequisites
Before configuring PIM-SSM, complete the following task:
■ Configure any unicast routing protocol so that all devices in the domain are
interoperable at the network layer.
Before configuring PIM-SSM, prepare the following data:
■ The SSM group range
Enabling PIM-SM The SSM model is implemented based on some subsets of PIM-SM. Therefore, a
device is PIM-SSM-capable after you enable PIM-SM on it.
When deploying a PIM-SM domain, you are recommended to enable PIM-SM on
all interfaces of non-border devices.
Follow these steps to enable PIM-SM:
Disable RPT-to-SPT switchover spt-switch-threshold
infinity [ group-policy
acl-number [ order
order-value ] ]
Optional
By default, the device
switches to the SPT
immediately after it receives
the first multicast packet
along the RPT.
To do... Use the command... Remarks
Task Remarks
“Enabling PIM-SM” on page 586 Required
“Configuring the SSM Group Range” on page 587 Optional
“Configuring PIM Common Information” on page 587 Optional
To do... Use the command... Remarks
Enter system view system-view -
Enable IP Multicast Routing multicast routing-enable Required
Disable by default
Enter VLAN/POS interface
view
interface interface-type
interface-number
-
Enable PIM-SM pim sm Required
Disabled by default