HP 3500YL - Manual (Page 88)

PIM-DM (Dense Mode)
Displaying PIM Data and Configuration Settings
Multicast Routing Protocol: Identifies the multicast routing
protocol through which the current flow was learned.
Unicast Routing Protocol: Identifies the routing protocol through
which the routing switch learned the upstream interface for
the current multicast flow. The listed protocol will be either
RIP, OSPF, or Static Route.
Downstream Interfaces:
VLAN: Lists the VID of the VLAN that the routing switch is
using to send the outbound packets of the current multicast
flow to the next-hop router.
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): Indicates the elapsed time in seconds since the
routing switch learned the displayed information about the
current multicast flow.
Expiry Time: Shows the remaining time in seconds until the
Next-Hop routing switch ages-out the current flow (group
membership) on the indicated VLAN. Includes the date calcu­
lated for the age-out event. This value decrements until:
• Reset by a state refresh packet originating from the
upstream multicast router. (The upstream multicast router
issues state refresh packets for the current group as long as
it either continues to receive traffic for the current flow or
receives state refresh packets for the current flow from
another upstream multicast router
.
• Reset by a new flow for the current multicast group on the
VLAN
.
• The timer expires (reaches 0). In this case the switch has
not received either a state refresh packet or new traffic for
the current multicast group, and ages-out (drops) the group
entry.
Note that the “Next-Hop routing switch” is the next multicast
routing switch in the path from the current multicast routing
switch to the source for the displayed multicast flow.
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