D-Link DES-6300 User Manual page 169

Modular L3 Ethernet Switch User's Guide
Figure 6- 144. PIM IPM Route Table window
The PIM IPM Route Table displays the following fields:
♦ Group – Specifies the IP address of the multicast group. The range is 244.0.0.0-
239.255.255.255.
♦ Source – Specifies the source IP address from where the multicast packets are being sent.
♦ Source Mask – Mask all or part of the source IP address.
♦ Upstream Assert Timer – Indicates the time before the router reverts from its upstream
router to its RPF neighbor. When a multicast packet is received, the router sends an assert
packet on a subnet indicating what metrics were used to reach the packet's source address. The
router with the best metrics becomes the forwarding router. All other upstream routes are
pruned. The downstream routers also compare if the RPF with the forwarding router. This
ensures that the downstream routers send their prunes and grafts to the correct neighbor. The
forwarding router sends an assert message to notify the other routers that it is the forwarding
router. Downstream routers select the upstream router with the smallest metrics as their RPF
neighbor. If two routers have the same metrics, the router with the highest IP address is chosen.
When the assert timer expires, the downstream may switch from the forwarding router to a RPF
neighbor. A value of 0 indicates that the assert has not changed the upstream neighbor to a RPF
neighbor.
♦ AssertMetric – Specifies the metrics advertised by the forwarding router. A value of 0
indicates that no assert was received.
♦ Assert MetricPref – Indicates the preference advertised by the forwarding router on the
upstream interface. Asset MetricPref is used when upstream routers are running different
Unicast protocols. A value of 0 indicates that no assert is in effect.
♦ Assert RPT Bit – Indicates the value of the RPT bit advertised by the forwarding router
♦ Flags – Specifies the PIM-specific flags pertaining to the multicast state entry.
PIM IPM Route Next Hop
The PIM IPM Route Next Hop window contains the next-hops information of IP multicast packets. The
PIM IPM Route Next Hop contains an entry for each outgoing interface listed in the multicast routing
table running PIM, and whose state is pruned.
To display the PIM IPM Route Next Hop table:
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