KB.15.15

subnet mask, and gateway address. All other configuration settings in the downloaded

configuration file are applied.

• If the switch's current IPv6 address for VLAN 1 was assigned from a DHCP server and not

statically configured, IP preserve is suspended. The IPv6 addressing specified in the downloaded

configuration file is implemented when the switch copies the file and reboots.

• If the downloaded file specifies DHCP/Bootp as the source for the IPv6 address of VLAN

1, the switch uses the IPv6 address assigned by the DHCP/Bootp server.

• If the file specifies a dedicated IPv6 address and subnet mask for VLAN 1 and a Gateway

IPv6 address, the switch implements these settings in the startup-config file.

Verifying how IP preserve was implemented in a switch

After the switch reboots, enter the show run command. Example 30 (page 52) shows an example

in which all configurations settings have been copied into the startup-config file except for the IPv6

address of VLAN 1 (2001:db8::214:c2ff:fe4c:e480) and the default IPv6 gateway

(2001:db8:0:7::5), which were retained.

If a switch received its IPv6 address from a DHCP server, the "ip address" field under "vlan 1"

would display dhcp-bootp.

Example 30 Configuration file with dedicated IP addressing

HP Switch(config)# show run

Running configuration:

; J8715A Configuration Editor; Created on release #K.14.01

hostname "HP Switch"

module 1 type J8702A

module 2 type J8705A

trunk 11-12 Trk1 Trunk

ip default-gateway 2001:db8:0:7::5

snmp-server community "public" Unrestricted

vlan 1

name "DEFAULT_VLAN"

untagged 1-10,13-24,1-24,Trk1

ip address 2001:db8::214:c2ff:fe4c:e480

exit

spanning-tree Trk1 priority 4

password manager

password operator

NOTE: Because the switch’s IPv6 address and default gateway were statically

configured (not assigned by a DHCP server), when the switch boots up with the IP

Preserve startup configuration file (see “How to enter IP preserve in a configuration

file” (page 51)), its current IPv6 address, subnet mask, and default gateway are

not changed. If a switch’s current IP address was acquired from a DHCP/Bootp

server, the IP Preserve statement is ignored and the IP ddresses in the downloaded

configuration file are implemented.

For more information on how to use the IP preserve feature, see the "Configuring IP Addressing"

chapter in the current Basic Operation Guide .

View the neighbor cache

ND occurs when there is communication between IPv6 devices on a VLAN. A neighbor destination

is reachable from a given source address if a confirmation (neighbor solicitation) has been received

52 IPv6 Management Features