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V1 Timer The time remaining until the switch assumes that there are no
longer any IGMP Version 1 members on the IP subnet attached to
this interface. (The default is 400 seconds.)
If the switch receives an IGMP Version 1 Membership Report, it
sets a timer to note that there are Version 1 hosts present which
are members of the group for which it heard the report.
If there are Version 1 hosts present for a particular group, the
switch will ignore any Leave Group messages that it receives for
that group.
Displaying the Multicast Forwarding Cache
The switch maintains a cache of multicast routing entries used to calculate the delivery
tree in multicast routing protocols. The Multicast Forwarding Cache includes the
subnetwork that contains the multicast source and the nearest upstream neighbor for
each known multicast group address.
Parameter Description
Group Address An IP multicast group address with subscribers directly attached or
downstream from this switch.
Source Address The IP subnetwork at the root of the multicast delivery tree. This
subnetwork contains a known multicast source.
Mask Subnet mask that is used for the source address. This mask
identifies the host address bits used for routing to specific subnets.
Upstream
Neighbor
The IP address of the network device immediately upstream for this
group.
Protocol The multicast routing protocol associated with this entry.
Up Time The time elapsed since this entry was created.
Displaying the DVMRP Routing Table
The DVMRP Routing Table contains all the IP multicast routes learned by the DVMRP
protocol. The routes displayed in this table are used by this switch to forward new IP
multicast traffic. They do not reflect active multicast flows.
Parameter Description
Source Address The IP subnetwork at the root of the multicast delivery tree. This
subnetwork contains a known multicast source.