3Com Switch 8800 Family Configuration Guide

PIM-DM Configuration 457
■ Configuring the maximum number of PIM neighbor on an interface
■ Clearing PIM neighbors
Enabling Multicast Refer to “Enabling Multicast Routing” “Enabling Multicast Routing”.
Enabling PIM-DM PIM-DM needs to be enabled in configuration of all interfaces.
After PIM-DM is enabled on an interface, it will send PIM Hello messages
periodically and process protocol packets sent by PIM neighbors.
Perform the following configuration in VLAN interface view.
It’s recommended to configure PIM-DM on all interfaces in non-special cases. This
configuration is effective only after the multicast routing is enabled in system view.
Once enabled PIM-DM on an interface, PIM-SM cannot be enabled on the same
interface and vice versa.
Configuring the Time
Intervals for Ports to
Send Hello Packets
When protocol independent multicast (PIM) protocol is enabled for a port, the
port sends Hello packets periodically. The time intervals to send Hello packets vary
with the bandwidth and type of the connected networks.
Perform the following configuration in interface view.
You can configure different time intervals according to the actual networks. By
default, the time interval for sending Hello packets is 30 seconds. In general, you
need not modify the parameter seconds.
n
■ The time interval can be configured only after the PIM protocol such as
protocol independent multicast-dense mode (PIM-DM) protocol or protocol
independent multicast-sparse mode (PIM-SM) protocol is enabled in interface
view.
■ When you configure the time interval for a port to send Hello packets, the pim
neighbor hold-time value automatically turns into 3.5 times the time interval
value. Therefore you need not configure a value for pim neighbor hold-time.
Entering the PIM View Global parameters of PIM should be configured in PIM view.
Tab le 447 Enable PIM-DM
Operation Command
Enable PIM-DM on an interface pim dm
Disable PIM-DM on an interface undo pim dm
Tab le 448 Configure the time intervals for ports to send Hello packets
Operation Command
Configure the time intervals for ports to send Hello packets pim timer hello seconds
Restore the default values of the time intervals undo pim timer hello