IPv6 Configuration Guide K/KA/KB.15.15

The following steps provide a general outline of the steps for configuring the routing switch for
non-default RA operation on all IPv6-enabled VLANs or tunnels:
1. Enable IPv6 routing on your network.
2. Enable IPv6 unicast routing. (This must be enabled to allow configuration of other routing
protocols).
HP Switch(config)# ipv6 unicast-routing
(This command enables RA transmission on any VLAN where RAs are not specifically
suppressed.)
3. Configure the desired per-VLAN or per-tunnel RA operation:
a. Use the M-bit and O-bit settings to specify the source for IPv6 host configuration; see page
186:
i. M-bit setting:
• Get configuration from RAs (default).
• Get configuration from DHCPv6.
ii. O-bit setting (applies only if M-bit setting is left in default state):
• Use RA source for global unicast prefixes (default).
• Do not use the RA for non-prefix configuration.
b. Configure global unicast prefix assignments; see page 189:
i. Specify any prefixes not configured on the routing switch VLAN or tunnel interface
that should be transmitted in RAs to IPv6 hosts on the VLAN.
ii. Deny any prefixes configured on the routing switch VLAN or tunnel interface that
should not be transmitted in RAs to IPv6 hosts on the VLAN. Default: Global unicast
prefixes configured on the routing switch VLAN interface are included in RAs.
c. Configure the maximum and minimum interval for transmitting router advertisements on
the VLAN; see page 187.
NOTE: The routing switch also transmits RAs when it receives router solicitations from
a host. Autoconfiguration must be enabled on the host before it will generate router
solicitations on the VLAN or tunnel.
d. Configure the ND policy for hosts on the VLAN or tunnel to use:
i. Hop-limit; Default; 64, see page 188.
ii. Default router lifetime; Default: 1800 seconds, see page 188.
iii. Reachable time duration to advertise for confirmed neighbors; Default: unspecified
(0); see page 189.
iv. Retransmit time to advertise for neighbor solicitations; Default: unspecified (0); see
page 189.
e. Configure per-VLAN RA suppression for any VLAN or tunnel on which you do not want
the routing switch to transmit RAs. See page 196.
HP Switch(vlan-1)# ipv6 nd ra suppress
HP Switch(tunnel-3)# ipv6 nd ra suppress
Guidelines for configuring RAs on multiple routing switches for the same
VLAN
Multiple routing switches transmitting RAs on the same VLAN or tunnel can provide redundancy.
Typically, a host identifies the first router from which it receives an RA as the default router. The
host uses any RAs received later from other routers to identify backup default routers.
Guidelines for configuring RAs on multiple routing switches for the same VLAN 201