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58 SHOW IP ADVERTISE Patch Release Note
Patch 86251-08 for Software Release 2.5.1
C613-10356-00 REV I
Note that IPv6 multicast packets will flood the VLAN when MLD snooping is
disabled.
To enable MLD snooping, use the command:
ENABLE MLDSNOOPING
To display debugging information, use the command:
ENABLE MLDSNOOPING DEBUG
This command displays the ports that are currently receiving MLD packets and
the ports that are being added or taken off the switch’s multicast group
membership registration.
To disable debugging, use the command:
DISABLE MLDSNOOPING DEBUG
To display information about MLD snooping, use the command:
SHOW MLDSNOOPING COUNTER
For more information, including limitations on which addresses and packet
types can be snooped, see the IPv6 Multicasting chapter of the Software
Reference.
Ping Polling of Device Reachability
This enhancement enables the router or switch to regularly check whether or
not it can reach a device. It also enables a trigger to activate on the router or
switch when the device becomes unreachable. While the device is unreachable,
the router or switch continues to monitor the device’s reachability, and another
trigger can be set to activate when the device becomes available again. For
example, the first trigger’s script could open and configure an alternative link
if the device at the other end of a preferred link became unavailable. The
second trigger’s script would automatically return traffic to the preferred link
as soon as it was available again.
To determine the device’s reachability, the router or switch will regularly send
ICMP Echo Request packets (“pings”) to the device. As long as the router or
switch receives ping responses from the device, it considers the device to be
reachable. After the router or switch has not received a reply to a set number of
ICMP Echo Requests, it considers the device to be unreachable. It continues to
try to ping the device, at an increased rate. After it receives a set number of
responses, it considers the device to be reachable again.
Configuring the router or switch to determine a device’s reachability and
respond to changes in reachability involves the following steps:
■ Create a polling instance, to periodically ping the device
■ Create scripts to run when the device becomes unreachable and when it
becomes reachable again
■ Configure triggers to run these scripts.