Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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(b) Checking the status of the IPv6 DHCP server on the Switch
1. Checking whether the IPv6 DHCP server service is running
Use the
show ipv6 dhcp server statistics command to check whether information can be
obtained from the IPv6 DHCP server daemon. If the following result is displayed by
executing the
show ipv6 dhcp server statistics command, use the service ipv6 dhcp
configuration command to configure the IPv6 DHCP server functionality again.
[Execution result]
> show ipv6 dhcp server statistics
> < show statistics >: dhcp6_server doesn't seem to be running.
2. Checking the remainder of the prefixes available for distribution
Use the
show ipv6 dhcp server statistics command to check the remainder of the prefixes
available for distribution by the IPv6 DHCP server. For details about the check procedure, see
the Configuration Guide. If it is found that the remainder of the prefixes is zero, increase the
total number of prefixes available for distribution. Note that the upper limit of the number of
prefixes available for distribution is 1024.
(c) Procedure for checking the configuration
1. Checking whether the IPv6 DHCP server functionality is set to be enabled
Use the
show service configuration command to check whether the IPv6 DHCP server is
enabled. In the following execution result, the underlined line indicates that the IPv6 DHCP
server functionality is disabled. If this line is not displayed, the IPv6 DHCP server
functionality is enabled.
[Execution result]
(config)# show service
no service ipv6 dhcp
!
(config)#
2. Checking the ipv6 dhcp server setting
Use the
show configuration command to check whether the ipv6 dhcp server setting exists.
If the setting does not exist, add the setting. If the setting exists, make sure that the specified
interface is configured for a network for client connections.
[Execution result]
(config)# show
interface vlan 10
ipv6 address 3ffe:1:2:: linklocal
ipv6 enable
ipv6 dhcp server Tokyo preference 100
!
(config)#
3. Checking the settings of ipv6 dhcp pool, ipv6 local pool, prefix-delegation, and
prefix-delegation pool
Use the show ipv6 dhcp configuration command to check whether the setting for prefix
distribution by the IPv6 DHCP server exists. If the setting does not exist, add the setting. If
the setting exists, check the setting values for
prefix-delegation and ipv6 local pool that
specify prefixes to be distributed. Also, check whether the
duid is set to specify the clients to
which the prefixes are distributed. Furthermore, check whether the client DUID values
specified for
duid are correct.
[Execution result]
(config)# show ipv6 dhcp
ipv6 dhcp pool Tokyo
prefix-delegation 3ffe:1:2::/48 00:03:00:01:11:22:33:44:55