Viewing the DHCPv6-relay configuration

Syntax:

show ipv6 helper–address [vlan <vid>]

Displays the DHCPv6-relay configuration on all VLANs configured on the routing switch or on the VLAN you specify.

Display of unicast Helper address configured on VLAN 10 in Routing a unicast DHCPv6 request across a multiple-hop topology

Switch(config)# show ipv6 helper–address

 VLAN: 10

 IPv6 Helper Address                     Egress Vlan
 ––––––––––––––––––––––––––––––––––––––– –––––––––––
 2001:db8:0:12::11                       1
1 Egress VLAN not used with unicast Helper addresses

Display of multicast Helper address configured on VLAN 10

Switch(config)# show ipv6 helper–address

 VLAN: 14

 IPv6 Helper Address                     Egress Vlan
 ––––––––––––––––––––––––––––––––––––––– –––––––––––
 FF05::1:3                               1
1 Egress VLAN required for multicast Helper addresses
NOTE:

Configuring a unicast IPv6 Helper address does not require the specification of an egress VLAN. However, an egress VLAN must be included when configuring a multicast Helper address.

Using the show ipv6 help–address vlan <vid> command displays the Helper address information for the specified VLAN in the same format as that shown above.

Syntax:

show run

Use this option to verify whether DHCPv6-relay is enabled on the routing switch. The output includes per-VLAN listings of any configured Helper addresses.

The show run command with DHCPv6-relay enabled

Switch(config)# show run

Running configuration:
 .
 .
 .
ipv6 hop-limit 25 1
ipv6 unicast–routing 2
interface loopback 1
   ip address 1.1.1.1
   exit
snmp–server community "public" unrestricted
vlan 10
   untagged 20–22
   ipv6 address fe80::1 link-local
   ipv6 address 2001:db8:0:10::1
   ipv6 helper–address unicast 2001:db8:0:12::11 3
   exit
vlan 14
   ipv6 address fe80::1 link-local
   ipv6 address 2001:db8:0:14::1
   exit

dhcpv6–relay 4

1 Nondefault hop-limit configured

2 IPv6 unicast routing enabled

3 DHCPv6 Helper address configured per-VLAN

4 DHCPv6-relay globally enabled

Use the show dhcpv6–relay command to display statistical information about DHCPv6 relay.

DHCPv6 relay information

Switch(config)# show dhcpv6–relay

 DHCPV6 Relay Agent : Enabled

 Client Requests Server Responses

 VLAN Name Received Dropped Failed Received Dropped Failed
 ––––––––– –––––––– ––––––– –––––– –––––––– ––––––– ––––––
 DEFAULT   120      0       0      120      0       0
 VLAN20    30       1       0      29       2       1