LevelOne GTL-2691 User Manual
Page 1578
C
HAPTER
50
| Multicast Routing Commands
PIM Multicast Routing
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globally for the router with the
PIM-DM or PIM-SM for each interface that will participate in multicast
routing with this command.
◆
If you enable PIM on an interface, you should also enable MLD (see
) on that interface. PIM mode selection
determines how the switch populates the multicast routing table, and
how it forwards packets received from directly connected LAN
interfaces. Dense mode interfaces are always added to the multicast
routing table. Sparse mode interfaces are added only when periodic
join messages are received from downstream routers, or a group
member is directly connected to the interface.
◆
Dense-mode interfaces are subject to multicast flooding by default, and
are only removed from the multicast routing table when the router
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)#ipv6 pim dense-mode
Console(config-if)#end
Console#show ipv6 pim interface
PIM is enabled.
VLAN 1 is up.
PIM Mode : Dense Mode
IPv6 Address : None
Hello Interval : 30 sec
Hello HoldTime : 105 sec
Triggered Hello Delay : 5 sec
Join/Prune Holdtime : 210 sec
Lan Prune Delay : Disabled
Propagation Delay : 500 ms
Override Interval : 2500 ms
Graft Retry Interval : 3 sec
Max Graft Retries : 3
State Refresh Ori Int : 60 sec
Console#