Enabling Nd Proxy - HP A5120 EI Series Configuration Manual

source VLAN are consistent with those of the existing entry) is received, the switch stops sending
DAD NS messages and updates the receiving port and aging time of the existing entry if the
receiving ports are different, or only the aging time of the entry if the receiving ports are the same. If
no corresponding NA message is received within five seconds after the first DAD NS message is
sent, the switch starts to check the validity of the received ND packet.
 To check the validity of the received ND packet (packet A for example), the switch sends out a DAD
NS message including the source IPv6 address of packet A every one second for three times at
most. If a corresponding NA message (whose source IPv6 address, source MAC address, and
source VLAN are consistent with those of packet A) is received, the switch stops sending DAD NS
messages and updates the receiving port and aging time of the entry if the receiving ports are
different, or only the aging time of the entry if the receiving ports are the same. If no corresponding
NA message is received within five seconds after the first DAD NS message is sent, the switch does
not update the entry.
Aging 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 switch performs active acknowledgement.
The switch sends out a DAD NS message including the IPv6 address of the ND snooping entry every one
second for three times at most.
If a corresponding NA message is received (the source IPv6 address, source MAC address, and

source VLAN are consistent with those of the existing entry), the switch stops sending DAD NS
messages and updates receiving port and aging time of the existing entry if the receiving ports are
different, or only the aging time if the receiving ports are the same.
 If no corresponding NA message is received within five seconds after the first DAD NS message is
sent out, the switch removes the entry when the timer expires.
Configuration procedure
Follow these steps to configure ND snooping:
To do...
Enter system view
Enter VLAN view
Enable ND snooping
Return to system view
Enter Layer 2 Ethernet interface
view/Layer 2 aggregate interface
view
Configure the maximum number
of ND snooping entries the
interface can learn

Enabling ND proxy

Use the command...
system-view
vlan vlan-id
ipv6 nd snooping enable
quit
interface interface-type interface-
number
ipv6 nd snooping max-learning-
num number
130
Remarks
—
—
Required
Disabled by default.
—
—
Optional
By default, the number of ND
snooping entries an interface can
learn is unlimited.