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Common Multicast Configuration 323
Diagnosis 3: Multicast forwarding table set up on the bottom layer is wrong.
1 Enable IGMP Snooping group in user view and then input the command
display
igmp-snooping group
to check if MAC multicast forwarding table in the bottom
layer and that created by IGMP Snooping is consistent. You may also input the
display mac vlan command in any view to check if MAC multicast forwarding table
under vlanid in the bottom layer and that created by IGMP Snooping is consistent.
2 If they are not consistent, refer to Technical Support for assistance.
Common Multicast
Configuration
A common multicast configuration covers both the multicast group management
protocol and the multicast routing protocol. The configuration includes enabling
multicast, configuring the multicast forwarding boundary, and displaying the
multicast routing table and multicast forwarding table.
Common multicast configuration includes:
■ Enabling multicast
■ Configuring the multicast route limit
■ Clearing MFC forwarding entries or statistics information
■ Clearing route entries from the core multicast routing table
Enabling Multicast Enable multicast first before enabling IGMP and the multicast routing protocol.
Perform the following configuration in system view.
By default, multicast is disabled.
Other multicast configurations can only become effective when multicast is enabled.
Configuring the Number
Limit of Multicast
Routing Entries
The number of multicast routing entries can be limited to prevent the router memory
from being exhausted.
Perform the following configuration in System View.
By default, the multicast route-limit is 1000.
Table 320 Enabling multicast
Operation Command
Enable multicast multicast routing-enable
Disable multicast undo multicast routing-enable
Table 321 Configuring number limit of multicast routing entries
Operation Command
Configure number limit of multicast routing
entries
multicast route-limit limit
Restore the default number limit undo multicast route-limit