Dell FCX624-I Laptop User Manual


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658 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Configuring IGMP snooping
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IGMPv2 membership reports of the same group from different clients are considered to be the
same and are rate-limited.
Use the following command to alleviate report storms from many clients answering the upstream
router query.
PowerConnect(config)# ip multicast report-control
Syntax: [no] ip multicast report-control
The original command, ip igmp-report-control, has been renamed to ip multicast report-control. The
original command is still accepted; however, it is renamed when you issue a show configuration
command.
Modifying the wait time before stopping traffic when receiving a leave message
You can define the wait time before stopping traffic to a port when a leave message is received.
The device sends group-specific queries once per second to ask if any client in the same port still
needs this group. The value range is from 1 through 5, and the default is 2. Due to internal timer
granularity, the actual wait time is between n and (n+1) seconds (n is the configured value).
PowerConnect(config)# ip multicast leave-wait-time 1
Syntax: [no] ip multicast leave-wait-time <num>
Modifying the multicast cache age time
You can set the time for an mcache to age out when it does not receive traffic. The traffic is
hardware switched. One minute before aging out an mcache, the device mirrors a packet of this
mcache to CPU to reset the age. If no data traffic arrives within one minute, this mcache is deleted.
A lower value quickly removes resources consumed by idle streams, but it mirrors packets to CPU
often. A higher value is recommended only data streams are continually arriving. The range is from
60 through 3600 seconds, and the default is 60 seconds.
PowerConnect(config)# ip multicast mcache-age 180
Syntax: [no] ip multicast mcache-age <num>
Enabling or disabling error and warning messages
The device prints error or warning messages when it runs out of software resources or when it
receives packets with the wrong checksum or groups. These messages are rate-limited. You can
turn off these messages by entering the following command.
PowerConnect(config)# ip multicast verbose-off
Syntax: [no] ip multicast verbose-off
Enabling or disabling PIM sparse snooping
PIM snooping must be used only in topologies where multiple PIM sparse routers connect through
a device. PIM snooping does not work on a PIM dense mode router which does not send join
messages, and traffic to PIM dense ports is stopped. A PIM snooping-enabled device displays a
warning if it receives PIM dense join or prune messages. Configure PIM sparse snooping by
entering the following command.
PowerConnect(config)# ip pimsm-snooping