Viewing the RA configuration

Syntax:

show ipv6 nd ra

show ipv6 nd ra [prefix [vlan <vid>]]

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

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

prefix vlan <vid> : Displays values for each prefix configured using ipv6 nd ra prefix on the specified VLAN; see Configuring the global unicast prefix and lifetime for hosts on a VLAN.

IPv6 Prefix : Displays values for specific prefixes configured for RAs on a VLAN by the ipv6 nd ra prefix command, plus Default (to apply to any global unicast prefixes on the same VLAN(s) that have not been specifically 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.

General output listing the per-VLAN 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

 VLAN Suppress Interval Lifetime Mngd Other RCH Time NS Intrvl Hop
  ID    RA     Min/Max   (sec)   Flag Flag    (ms)     (ms)   Limit
––––– –––––––– –––––––– –––––––– –––– ––––– –––––––– –––––––– –––––
1     Yes      200/600  1800     No   No    0        0        10
22    No       200/600  1800     No   No    0        0        10
30    Yes      200/600  1000     No   No    0        0        4

Output for VLANs where specific prefixes have been configured for RAs

Switch(config)# show ipv6 nd ra prefix
 
  IPv6 Neighbor Discovery Prefix Information

VLAN Name : VLAN30

  IPv6 Prefix                       Valid Lifetime      Onlink/Auto
  ––––––––––––––––––––––––––––––––– ––––––––––––––––––– –––––––––––
  Default                           Infinite            On/On
  2001:db8:f:1b::/64                12/31/2010 00:00:01 Off/On
  2001:db8:f:1d::/64                12/31/2010 00:00:01 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     : 11/31/2014 00:00:01
   Preferred Lifetime : 11/01/2014 00:00:01
   On–link Flag       : Off
   Autonomous Flag    : On
   Advertise Flag     : On

   IPv6 Prefix        : 2001:db8:f:1d::/64
   Valid Lifetime     : 11/31/2014 00:00:01
   Preferred Lifetime : 11/01/2014 00:00:01
   On–link Flag       : On
   Autonomous Flag    : On
   Advertise Flag     : On