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518 CHAPTER 36: CONFIGURING PIM-SM
By default, no interface is configured to be candidate RP.
Use pim command in system view to enter PIM view.
Generally, only one C-BSR and one C-RP are configured in the network, and
usually it is the same router. Only one C-BSR can be configured for a single router.
The latter configured C-BSR replaces the formerly configured C-BSR. Subscribers
are recommended to configure the C-RP and C-BSR at the loopback interface of
the same router. This reduces the network oscillation caused by physical interface
alternating UP/DOWN, because the router loopback interface is always UP.
Configuring the PIM-SM
Domain Boundary
When the scale of a network is large, the network needs to be divided into several
multicast domains. A different multicast domain can be in charge of a different RP.
After the PIM domain boundary has been configured, the BSR message and RP
message do not break through this boundary, but the other PIM messages are able
to pass through the domain boundary.
Make the following configuration in the interface view.
Table 591 Configure PIM-SM Domain Boundary
By default, no PIM-SM domain boundary is configured.
Configuring the Time
Interval for Sending a
Hello Message
After the interface starts PIM-SM protocol, it will periodically transmits a hello
message to all the PIM routers (group address is 224.0.0.13) to find PIM
neighbors. the query interval timer determines this time interval. If the interface
receives the Hello message, it means that there are adjacent PIM routers for this
interface, and this interface can add the neighbor to its interface neighbor list. If
the interface does not receive a hello message from the neighbors in the interface
neighbor list within a specific period, it is assumed that the neighbor must have
left the multicast network. The time interval for sending a hello message can be
configured according to the bandwidth and the type of the network the interface
connects to.
Make the following configuration in the interface view.
Table 592 Configure the Time Interval of Interface Sending Hello Message
Configure an interface to be candidate RP c-rp interface-type interface-number
[ accept-policy acl-number [ priority
] ]
Disable an interface from being candidate
RP
undo c-rp interface-type
interface-number
Operation Command
Set PIM domain boundary pim bsr-boundary
Delete PIM domain boundary undo pim bsr-boundary
Operation Command
Configure the time interval of interface
sending Hello message
pim timer hello seconds
Restore the default value of the time
interval of interface sending Hello
message
undo pim timer hello