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M
ULTICAST
R
OUTING
3-321
Displaying the Multicast Routing Table
You can display information on each multicast route this router has
learned via DVMRP or PIM. The router learns multicast routes from
neighboring routers, and also advertises these routes to its neighbors. The
router stores entries for all paths learned by itself or from other routers,
without considering actual group membership or prune messages. The
routing table therefore does not indicate that the router has processed
multicast traffic from any particular source listed in the table. It uses these
routes to forward multicast traffic only if group members appear on
directly-attached subnetworks or on subnetworks attached to downstream
routers.
Field Attributes
• Group Address – IP group address for a multicast service.
• Source Address – Subnetwork containing the IP multicast source.
• Netmask – Network mask for the IP multicast source.
• Interface – Interface leading to the upstream neighbor.
• Owner – The associated multicast protocol (i.e., DVMRP or PIM).
• Flags – The flags associated with each interface indicate prune (P) if
the downstream interface has been recently terminated or forwarding
(F) if the interface is still active.
• Detail – This button displays detailed information for the selected
entry.
• Upstream Router* – The multicast router immediately upstream for
this group.
• Downstream* – Interface(s) on which multicast subscribers have
been recorded.
* These items are displayed in the IP Multicast Routing Entry (Detail) table.