C
HAPTER
44
| IP Interface Commands
ND Snooping
– 1425 –
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If an RA message is received in response to the original NS
message (indicating a duplicate address) before the dynamic
binding timeout period expires, the entry is deleted. Otherwise,
when the timeout expires, the entry is dropped if the auto-detection
process is not enabled.
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If the auto-detection process is enabled, the switch periodically
sends an NS message to determine is the client still exists. If it does
not receive an RA message in response after the configured
timeout, the entry is dropped. If the switch receives an RA message
before the timeout expires, it resets the lifetime for the dynamic
binding, and the auto-detection process resumes.
EXAMPLE
This example enables ND snooping globally and on VLAN 1.
Console(config)#ipv6 nd snooping
Console(config)#ipv6 nd snooping vlan 1
Console(config)#
ipv6 nd snooping
auto-detect
This command enables automatic validation of dynamic user binding table
entries by periodically sending NS messages and awaiting NA replies. Use
the no form to disable this feature.
SYNTAX
[no] ipv6 nd snooping auto-detect
DEFAULT SETTING
Disabled
COMMAND MODE
Global Configuration
COMMAND USAGE
If auto-detection is enabled, the switch periodically sends an NS message
to determine is a client listed in the dynamic binding table still exists. If it
does not receive an RA message in response after the configured timeout,
the entry is dropped. If the switch receives an RA message before the
timeout expires, it resets the lifetime for the dynamic binding, and the
auto-detection process resumes.
EXAMPLE
Console(config)#ipv6 nd snooping auto-detect
Console(config)#
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