HP 3600 v2 Series Configuration Manual page 143

If neither of them matches the entry and the received packet is a DAD NS message, the
message is ignored.
If neither of them matches the entry and the received packet is not a DAD NS message, the
device performs active acknowledgement.
The active acknowledgement is performed in the following steps.
The device checks the validity of the existing ND snooping entry. The device sends out a DAD
NS message including the IPv6 address of the ND snooping entry. If a corresponding NA
message (whose source IPv6 address, source MAC address, receiving port, and source VLAN
are consistent with those of the existing entry) is received, the device updates the aging time of
the existing entry. If no corresponding NA message is received within one second after the
DAD NS message is sent, the device starts to check the validity of the received ND packet.
To check the validity of the received ND packet (packet A for example), the device sends out a
DAD NS message including the source IPv6 address of packet A. If a corresponding NA
message (whose source IPv6 address, source MAC address, receiving port, and source VLAN
are consistent with those of packet A) is received, the device updates the aging time of the entry.
If no corresponding NA message is received within one second after the DAD NS message is
sent, the device does not update the entry.
Age out an ND snooping entry.
3.
An ND snooping entry is aged out after 25 minutes. If an ND snooping entry is not updated within
15 minutes, the device performs active acknowledgement.
The device sends out a DAD NS message including the IPv6 address of the ND snooping.
If a corresponding NA message is received (the source IPv6 address, source MAC address,
receiving port, and source VLAN are consistent with those of the existing entry), the device
updates the aging time of the existing entry.
If no corresponding NA message is received within one second after the DAD NS message is
sent out, the device removes the entry when the timer expires.
Configuration procedure
To configure ND snooping:
Step
1. Enter system view.
2. Configure ND snooping.
3. Enter VLAN view.
4. Enable ND snooping.
5. Return to system view.
Command
system-view
•
Enable ND snooping based on global
unicast addresses (the devices use DAD
NS messages containing global unicast
addresses to create ND snooping entries):
ipv6 nd snooping enable global
•
Enable ND snooping based on link local
addresses (the devices use DAD NS
messages containing link local addresses
to create ND snooping entries):
ipv6 nd snooping enable link-local
vlan vlan-id
ipv6 nd snooping enable
quit
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Remarks
N/A
Use either approach.
By default, ND snooping is
disabled.
N/A
Disabled by default.
N/A