show ipv6 nd ra

Syntax

show ipv6 nd ra

show ipv6 nd ra prefixvlan vid

Description

Without the optional keywords, this command displays the global and per-VLAN, and per tunnel router advertisement neighbor discovery configuration on a specific routing switch. This indicates the per-VLAN or per-tunnel content of RAs transmitted from the routing switch.

Options

prefix

Displays the prefixes, valid lifetime, and onlink/auto values advertised by the routing switch on all VLANs or tunnels configured for RA operation.

prefix vlan vid

Displays values for each prefix configured using ipv6 nd ra prefix on the specified VLAN or tunnel.

IPv6 Prefix

Displays values for specific prefixes configured for RAs on a VLAN or tunnel by the ipv6 nd ra prefix command, plus Default (to apply to any global unicast prefixes on the same VLAN(s) or tunnel(s) that have not been configured by ipv6 nd ra prefix).

Valid Lifetime

The valid lifetime configured for the indicated prefix.

Preferred Lifetime

The preferred lifetime configured for the indicated prefix.

On-link Flag

Indicates whether the prefix is advertised as on-link.

Default: On; On-link enabled.

Autonomous Flag

Indicates whether address autoconfiguration is turned on.

Default: On; Autoconfiguration enabled.

Advertise Flag

Indicates whether advertisement for the subject prefix is turned on.

Default: On.

Example output

General Output Listing the RA Configuration on a Routing Switch

Switch(config)# show ipv6 nd ra

IPv6 Router Advertisement Configuration

Global RA Suppress   : No
Global Hop Limit     : 10
IPv6 Unicast Routing : Enabled

Interface Supp Interval Lifetime Mngd Other RCH Time NS Intrvl Hop
ID        RA   Min/Max  (sec)    Flag Flag  (ms)     (ms)    Limit
--------- ---- -------- -------- ---- ----- -------- ------- -----
vlan-1    Yes  200/600  1800     No   No    0        0       10
vlan-22   No   200/600  1800     No   No    0        0       10
tunnel-3  Yes  200/600  1000     No   No    0        0       4

Output where specific prefixes have been configured for RAs

Switch(tunnel-3)# ipv6 nd ra prefix default 1296000 1209600

Switch(config)# show ipv6 nd ra prefix

  IPv6 Neighbor Discovery Prefix Information

VLAN Name : VLAN22

  IPv6 Prefix                  Valid Lifetime      Onlink/Auto
  ---------------------------- ------------------- -----------
  Default                      Infinite            On/On
  2001:db8:0:a::/64            1h:20m:44s          Off/On

Tunnel Name : Tunnel3

  IPv6 Prefix                  Valid Lifetime      Onlink/Auto
  ---------------------------- ------------------- -----------
  Default                      15 days             On/On

Detailed prefix configuration data for a specific VLAN

Switch(config)# show ipv6 nd ra prefix vlan 30

 IPv6 Neighbor Discovery Prefix Information

 VLAN Name : VLAN30

   IPv6 Prefix        : Default
   Valid Lifetime     : Infinite
   Preferred Lifetime : Infinite
   On-link Flag       : On
   Autonomous Flag    : On
   Advertise Flag     : On

   IPv6 Prefix        : 2001:db8:f:1b::/64
   Valid Lifetime     : 11/31/2010 00:00:01
   Preferred Lifetime : 11/01/2010 00:00:01
   On-link Flag       : Off
   Autonomous Flag    : On
   Advertise Flag     : On

   IPv6 Prefix        : 2001:db8:f:1d::/64
   Valid Lifetime     : 11/31/2010 00:00:01
   Preferred Lifetime : 11/01/2010 00:00:01
   On-link Flag       : On
   Autonomous Flag    : On
   Advertise Flag     : On