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| Multicast Routing Commands
C
52
HAPTER
PIM Multicast Routing
ip pim
hello-holdtime
determines that there are no group members or downstream routers,
or when a prune message is received from a downstream router.
Sparse-mode interfaces forward multicast traffic only if a join message
◆
is received from a downstream router or if group members are directly
connected to the interface. When routers want to receive a multicast
flow, they periodically send join messages to the Rendezvous Point
(RP), and are subsequently added to the shared path for the specified
flow back up to the RP. If routers want to join the source path up
through the Shortest Path Source Tree (SPT), they periodically send
join messages toward the source. They also send prune messages
toward the RP to prune the shared path if they have already connected
to the source through the SPT, or if there are no longer any group
members connected to the interface.
E
XAMPLE
Console(config)#interface vlan 1
Console(config-if)#ip pim dense-mode
Console(config-if)#end
Console#show ip pim interface
PIM is enabled.
VLAN 1 is up.
PIM Mode
IP Address
Hello Interval
Hello HoldTime
Triggered Hello Delay
Join/Prune Holdtime
Lan Prune Delay
Propagation Delay
Override Interval
Graft Retry Interval
Max Graft Retries
State Refresh Ori Int
Console#
This command configures the interval to wait for hello messages from a
neighboring PIM router before declaring it dead. Use the no form to restore
the default value.
S
YNTAX
ip pim hello-holdtime seconds
no ip pim hello-interval
seconds - The hold time for PIM hello messages. (Range: 1-65535)
D
S
EFAULT
ETTING
105 seconds
C
M
OMMAND
ODE
Interface Configuration (VLAN)
– 1930 –
:
Dense Mode
:
192.168.0.2
:
30 sec
:
105 sec
:
5 sec
:
210 sec
:
Disabled
:
500
ms
:
2500
ms
:
3 sec
:
3
:
60 sec
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