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 |
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| Group Address | An IP multicast group address with subscribers directly attached or |
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| downstream from this switch. |
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| Source Address | The IP subnetwork at the root of the multicast delivery tree. This |
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| subnetwork contains a known multicast source. |
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| Mask | Subnet mask that is used for the source address. This mask |
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| identifies the host address bits used for routing to specific subnets. |
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| Upstream | The IP address of the network device immediately upstream for this |
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| Neighbor | group. |
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| Protocol | The multicast routing protocol associated with this entry. |
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| Up Time | The time elapsed since this entry was created. |
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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 |
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Source Address | The IP subnetwork at the root of the multicast delivery tree. This |
| subnetwork contains a known multicast source. |
