HP 6125XLG R2306-HP 6125XLG Blade Switch IP Multicast Configuration Guide - Page 31

Setting the maximum number of multicast groups on a port

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• When dropping unknown multicast data is enabled, the switch forwards unknown multicast data to other router ports instead of flooding it in the VLAN. If no other router ports exist, the switch drops the unknown multicast data. To enable dropping unknown multicast data for a VLAN: Step 1. Enter system view. 2. Enter VLAN view. 3. Enable dropping unknown multicast data for the VLAN. Command system-view vlan vlan-id igmp-snooping drop-unknown Remarks N/A N/A By default, this function is disabled. Unknown multicast data is flooded. Setting the maximum number of multicast groups on a port You can set the maximum number of multicast groups on a port to regulate the port traffic. When you set the maximum number of multicast groups on a port, follow these guidelines: • This configuration is effective for the multicast groups that a port dynamically joins. If you configure the port as a static member port for a multicast group, this configuration is not effective for the multicast group. • If the number of multicast groups on a port exceeds the limit, the system removes all the forwarding entries related to that port from the IGMP snooping forwarding table. The receiver hosts attached to that port can join multicast groups again before the number of multicast groups on the port reaches the limit. To set the maximum number of multicast groups on a port: Step 1. Enter system view. 2. Enter Ethernet interface view or aggregate interface view. 3. Set the maximum number of multicast groups on a port. Command system-view interface interface-type interface-number igmp-snooping group-limit limit [ vlan vlan-list ] Remarks N/A N/A The default setting is 4294967295. Enabling the multicast group replacement function When the number of multicast groups on a switch or a port exceeds the limit: • If the multicast group replacement is enabled, the switch or the port replaces an existing multicast group with a newly joined multicast group. • If the multicast group replacement is disabled, the switch or the port discards IGMP reports that are used for joining a new multicast group. In some specific applications, such as channel switching, a newly joined multicast group must automatically replace an existing multicast group. In this case, the function of multicast group replacement must also be enabled so a user can switch from the current multicast group to a new group. When you enable the multicast group replacement function, follow these guidelines 24

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24
•
When dropping unknown multicast data is enabled, the switch forwards unknown multicast data to
other router ports instead of flooding it in the VLAN. If no other router ports exist, the switch drops
the unknown multicast data.
To enable dropping unknown multicast data for a VLAN:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter VLAN view.
vlan
vlan-id
N/A
3.
Enable dropping unknown
multicast data for the VLAN.
igmp-snooping drop-unknown
By default, this function is disabled.
Unknown multicast data is flooded.
Setting the maximum number of multicast groups on a port
You can set the maximum number of multicast groups on a port to regulate the port traffic.
When you set the maximum number of multicast groups on a port, follow these guidelines:
•
This configuration is effective for the multicast groups that a port dynamically joins. If you configure
the port as a static member port for a multicast group, this configuration is not effective for the
multicast group.
•
If the number of multicast groups on a port exceeds the limit, the system removes all the forwarding
entries related to that port from the IGMP snooping forwarding table. The receiver hosts attached to
that port can join multicast groups again before the number of multicast groups on the port reaches
the limit.
To set the maximum number of multicast groups on a port:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Ethernet interface view
or aggregate interface view.
interface
interface-type
interface-number
N/A
3.
Set the maximum number of
multicast groups on a port.
igmp-snooping group-limit
limit
[
vlan
vlan-list
]
The default setting is
4294967295.
Enabling the multicast group replacement function
When the number of multicast groups on a switch or a port exceeds the limit:
•
If the multicast group replacement is enabled, the switch or the port replaces an existing multicast
group with a newly joined multicast group.
•
If the multicast group replacement is disabled, the switch or the port discards IGMP reports that are
used for joining a new multicast group.
In some specific applications, such as channel switching, a newly joined multicast group must
automatically replace an existing multicast group. In this case, the function of multicast group
replacement must also be enabled so a user can switch from the current multicast group to a new group.
When you enable the multicast group replacement function, follow these guidelines