Common Multicast Configuration 177
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 Multicast
Route Limit
If the existing route entries exceed the capacity value you configured using this
command, the system will not delete the existing entries. The following prompt is
shown;
Existing route entries exceed the configured capacity value.
Perform the following configuration in System view:
Tab le 184 Configuring Multiast Route Limit
Tab le 183 Enabling multicast
Operation Command
Enable multicast multicast routing-enable
Disable multicast undo multicast routing-enable
Operation Command
Configure number limit of multicast routing
entries
multicast route-limit
limit
Restore the default number limit
undo multicast route-limit
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