Chapter 30
| IP Interface Commands
ND Snooping
– 892 –
Command Mode
Global Configuration
Command Usage
The timeout after which the switch will delete a dynamic user binding if no RA
message is received is set to the retransmit count (see the ipv6 nd snooping auto-
detect retransmit count command) x the retransmit interval. Based on the default
settings, this is 3 seconds.
Example
Console(config)#ipv6 nd snooping auto-detect retransmit interval 5
Console(config)#
ipv6 nd snooping
prefix timeout
This command sets the time to wait for an RA message before deleting an entry in
the prefix table. Use the no form to restore the default setting.
Syntax
ipv6 nd snooping prefix timeout timeout
no ipv6 nd snooping prefix timeout
timeout – The time to wait for an RA message to confirm that a prefix entry
is still valid. (Range: 3-1800 seconds)
Default Setting
Set to the valid lifetime field in received RA packet
Command Mode
Global Configuration
Command Usage
If ND snooping is enabled and an RA message is received on a trusted interface, the
switch will add an entry in the prefix table based upon the Prefix Information
contained in the message. If an RA message is not received for a table entry with
the same prefix for the specified timeout period, the entry is deleted.
Example
Console(config)#ipv6 nd snooping prefix timeout 200
Console(config)#
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