LevelOne GTL-2691 - Manual (Page 709)

C HAPTER 21 | Multicast Routing
Configuring Global Settings for Multicast Routing
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D ISPLAYING THE
M ULTICAST R OUTING
T ABLE
Use the Multicast > Multicast Routing > Information page to display
information on each multicast route it has learned through 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.
CLI R EFERENCES
◆ "show ip mroute" on page 1546
P ARAMETERS
These parameters are displayed:
Show Summary
◆ Group Address – IP group address for a multicast service.
◆ Source Address – Subnetwork containing the IP multicast source.
◆ Source Mask – Network mask for the IP multicast source. (Note that
the switch cannot detect the source mask, and therefore displays
255.255.255.255 in this field.)
◆ Interface – Upstream interface leading to the upstream neighbor.
PIM creates a multicast routing tree based on the unicast routing table.
If the related unicast routing table does not exist, PIM will still create a
multicast routing entry, displaying the upstream interface to indicate
that this entry is valid. This field may also display “Register” to indicate
that a pseudo interface is being used to receive PIM-SM register
packets. This can occur for the Rendezvous Point (RP), which is the root
of the Reverse Path Tree (RPT). In this case, any VLAN receiving
register packets will be converted into the register interface.
◆ Owner – The associated multicast protocol (PIM-DM, PIM-SM, IGMP
Proxy).
◆ Flags – The flags associated with each routing entry indicate:
■
Forward – Traffic received from the upstream interface is being
forwarded to this interface.
■
Local – This is the outgoing interface.
■
Pruned – This interface has been pruned by a downstream
neighbor which no longer wants to receive the traffic.