3Com 7700 Configuration Manual page 142

134 C 6: M
HAPTER ULTICAST
P
ROTOCOL
Once enabled , PIM-DM cannot be enabled on the same interface.
Configure the Interface Hello Message Interval
Generally, PIM-SM advertises Hello messages periodically on the interface enabled
with it to detect PIM neighbors and discover which router is the Designated Router
(DR).
Perform the following configuration in VLAN interface view.
Table 24 Configure the Interface Hello Message Interval
Operation
Configure the interface hello
message interval
Restore the interval to the
default value
By default, the hello message interval is 30 seconds. Users can configure the value
according to different network environments.
This configuration can be performed only after the PIM (PIM-DM or PIM-SM) is
enabled in VLAN interface view.
Set the PIM-SM Domain Border
After the PIM-SM domain border is configured, bootstrap messages cannot cross
the border in any direction. In this way, the PIM-SM domain can be split.
Perform the following configuration in VLAN interface view.
Table 25 Set the PIM-SM Domain Border
Operation
Set the PIM-SM domain
border
Remove the PIM-SM domain
border configured
By default, no domain border is set. After this configuration is performed, a
bootstrap message cannot cross the border but other PIM packets can. This
configuration can effectively divide a network into domains using different BSRs.
CAUTION: This command cannot create a multicast packet forwarding border but
only a PIM bootstrap message border.
Enter PIM View
Global parameters of PIM should be configured in PIM view.
Perform the following configuration in system view.
Table 26 Enter PIM View
Operation
Enter PIM view
Back to system view
Command
pim timer hello seconds
undo pim timer hello
Command
pim bsr-boundary
undo pim bsr-boundary
Command
pim
undo pim