KB.15.15

[state] Indicates whether the outbound VLAN and next-hop

router for the current multicast flow are receiving

datagrams.

Pruned The routing switch has not detected

any joins from the current multicast

flow and is not currently forwarding

datagrams in the current VLAN.

Forwarding The routing switch has received a join

for the current multicast flow and is

forwarding datagrams in the current

VLAN.

Up Time (Sec) The natural state of a downstream interface in PIM-DM

is to forward multicast flows and DM will flood a new

flow out all interfaces on a router where there are

connected PIM-DM neighbors and/or joined hosts. If

there are ultimately no receivers for the flow

downstream, the flow will be pruned back to the

originator router. This prune state is maintained on all

PIM-DM routers by state refresh message sends by the

originator and corresponding prune replies from

downstream routers. However if a prune reply is not

received (i.e. there is now a receiver), expire time

indicates how long before the interface will return to a

forwarding state.

Expire Time (sec) The natural state of a downstream interface in PIM-DM