Multicast and Routing Guide K/KA/KB.15.15

For an mroute on an originator router whose
flow is no longer active - including mroutes
on non-originators whose flow has been
pruned — expire time indicates when the
mroute entry will eventually be cleared.
Multicast Routing Protocol Identifies the multicast routing protocol
through which the current flow was learned.
Unicast Routing Protocol Identifies the IP routing protocol through
which the routing switch learned the
upstream interface for the current multicast
flow. The listed protocol will be one of the
following:
• RIP
• connected
• OSPF
• static route
• other
Metric Indicates the path cost upstream to the
multicast source. Used when multiple
multicast routers contend to determine the
best path to the multicast source. The lower
the value, the better the path.
Metric Pref Used when multiple multicast routers contend
to determine the path to the multicast source.
When this value differs between routers, PIM
selects the router with the lowest value. If
Metric Pref is the same between contending
multicast routers, then PIM selects the router
with the lowest Metric value to provide the
path for the specified multicast traffic.
(Different vendors assign differing values for
this setting.)
Asset Timer The time remaining until the router ceases to
wait for a response from another multicast
router to negotiate the best path back to the
multicast source. If this timer expires without
a response from any contending multicast
routers, then the router assumes it is the best
path, and the specified multicast group traffic
will flow through the router.
RP Tree This field is not relevant to PIM-DM and will
always display No.
Downstream interfaces
For each downstream interface the following information is shown:
[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.
48 PIM-DM (Dense Mode)