IPv6 Configuration Guide K/KA/KB.15.15

8 IPv6 Router Advertisements
NOTE: All commands previously in the Summary of commands table are indexed under the entry
Command syntax.
Beginning with software release K.15.01, the routing switches support IPv6 RA configuration and
transmission based on RFC 4861, "Neighbor Discovery for IP Version 6 (IPv6)" and RFC 4862,
"IPv6 Stateless Address Autoconfiguration."
IPv6 RAs on a VLAN provide the ND policy the system administrator has configured for devices
running in IPv6 host mode with address autoconfiguration enabled. RAs also enable hosts on a
VLAN to build a list of default (reachable) routers on that VLAN or tunnel.
For general RA operation information, see “General RA operation” (page 199).
Global configuration context commands
Enabling or disabling IPv6 Router Advertisement generation
Syntax:
[no] ipv6 nd suppress-ra
Global config command to suppress transmission of IPv6 Router Advertisements on
all VLANs or tunnels configured on the routing switch. Overrides RAs enabled
per-VLAN.
The no form of the command globally disables Router Advertisement suppression.
Note that globally enabling Router Advertisements on the routing switch does not
override per-VLAN or per-tunnel IPv6 Router Advertisement suppression (using the
ipv6 nd ra suppress command in a VLAN or tunnel context). See “Suppressing
Router Advertisements on a VLAN” (page 194).
Default: RA suppression disabled
Enabling or disabling IPv6 routing
Syntax:
[no] ipv6 unicast-routing
Global config command to enable or disable IPv6 routing. Must be enabled for
routing operation. Enabling IPv6 routing activates RA generation on VLANs or
tunnels unless RAs are suppressed globally or per-VLAN or per-tunnel.
The no form of the command disables IPv6 routing and RAs on the routing switch.
Default: Disabled
VLAN or tunnel context ND configuration
Configuring DHCPv6 service requirements
Syntax:
[no] ipv6 nd ra managed-config-flag
[no] ipv6 nd ra other-config-flag
managed-config-flag
Controls the M-bit setting in RAs the router transmits on the current VLAN.
Enabling the M-bit directs clients to acquire their IPv6 addressing and ND host
186 IPv6 Router Advertisements