ProCurve 8200zl User's Guide download pdf (Page 74)

PIM-DM (Dense Mode)

Configuring PIM-DM

For example, if multiple routers are connected to the same

VLAN and the routing switch requests multicast traffic, all

routers on the VLAN receive that traffic. (Those which have

pruned the traffic will drop it when they receive it.) If the

upstream router loses contact with the routing switch

receiving the multicast traffic (that is, fails to receive a Hello

packet when expected), then the shorter Hello Interval causes

it to stop transmitting multicast traffic onto the VLAN

sooner, resulting in less unnecessary bandwidth usage.

Not used with the no form of the ip pim-dense command.

Syntax: ip pim-dense [ hello-delay < 0 - 5 >]

vlan < vid > ip pim-dense [ hello-delay < 0 - 5 >]

Changes the maximum time in seconds before the routing

switch actually transmits the initial PIM Hello message on

the current VLAN. In cases where a new VLAN activates with

connections to multiple routers, if all of the connected

routers sent Hello packets at the same time, then the

receiving router could become momentarily overloaded. This

value randomizes the transmission delay to a time between

0 and the hello delay setting. Using “0” means no delay. After

the routing switch sends the initial Hello Packet to a newly

detected VLAN interface, it sends subsequent Hello packets

according to the current Hello Interval setting. Not used with

the no form of the ip pim-dense command. Default: 5 seconds.

Syntax: ip pim-dense [ graft-retry-interval < 1-10 >]

vlan < vid > ip pim-dense [ graft-retry-interval < 1-10 >]

Graft packets result when a downstream router transmits a

request to join a flow. The upstream router responds with a

graft acknowledgment packet. If the Graft Ack is not received

within the time period of the graft-retry-interval, it resends the

graft packet. This command changes the interval (in

seconds) the routing switch waits for the Graft Ack

(acknowledgement) from another router before resending

the Graft request. Not used with the no form of the ip pim-

dense command. (Default: 3 seconds.)

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ProCurve 8200zl User's Guide Page 74