Catalyst 3750G ipv6 nd/dhcp unrecognized command

[berniebbow1]

I have couple of standalone 3750G switches where I am unable to attach DHCPv6 or RA policies to arbitrary switchport. I am able to define policy though. I also have couple of stacks with 3750E and standalone 3750Gs which work perfectly.

Another question: where are these policies stored?

I cannot see them (device-role host/client part is missing in running-config):

sw!#sh run

ipv6 nd raguard policy RAHOST
!
ipv6 dhcp guard policy DHCPHOST
!

As you can see below ipv6 nd/dhcp is unrecognized command.

sw1#sh sdm prefer
 The current template is "desktop IPv4 and IPv6 default" template.
 The selected template optimizes the resources in
 the switch to support this level of features for
 8 routed interfaces and 1024 VLANs.

  number of unicast mac addresses:                  2K
  number of IPv4 IGMP groups + multicast routes:    1K
  number of IPv4 unicast routes:                    3K
    number of directly-connected IPv4 hosts:        2K
    number of indirect IPv4 routes:                 1K
  number of IPv6 multicast groups:                  1.125k
  number of IPv6 unicast routes:                    3K
    number of directly-connected IPv6 addresses:    2K
    number of indirect IPv6 unicast routes:         1K
  number of IPv4 policy based routing aces:         0
  number of IPv4/MAC qos aces:                      0.5K
  number of IPv4/MAC security aces:                 1K
  number of IPv6 policy based routing aces:         0
  number of IPv6 qos aces:                          0.625k
  number of IPv6 security aces:                     0.5K
 

sw1#sh ver
Switch Ports Model              SW Version            SW Image                 
------ ----- -----              ----------            ----------               
*    1 52    WS-C3750G-48TS     15.0(2)SE10a          C3750-IPSERVICESK9-M


sw1(config-if)#ipv6 dhcp?
% Unrecognized command    

sw1(config-if)#ipv6 ?
IPv6 interface subcommands:
  crypto          Encryption/Decryption commands
  flow            Flow related commands
  mld             MLD interface commands
  nd              IPv6 interface Neighbor Discovery subcommands
  traffic-filter  Access control list for packets
 
sw1(config-if)#ipv6 nd ?
% Unrecognized command

[Julio E. Moisa]

Hi

I remember that the following sdm prefer template should be configured first: dual-ipv4-and-ipv6 and then restart the device to take effect. Is it showed on your device? otherwise it could be an IOS limitation and an upgrade is required. You could verify if the IOS supports IPv6 using this tool: http://cfn.cloudapps.cisco.com/ITDIT/CFN/jsp/index.jsp

SW(config)#sdm prefer ?
access Access bias
default Default bias
dual-ipv4-and-ipv6 Support both IPv4 and IPv6
routing Unicast bias
vlan VLAN bias

Is the command ipv6 unicast-routing available?

Hope it is useful

:-)

[berniebbow1]

Well, I honestly don't know what was causing the problem.

I again issued sdm prefer dual-ipv4-and-ipv6 default and then reloaded the switch and it worked. Maybe I had omitted default parameter first time.

[Julio E. Moisa]

Good to know, thanks for the update.

Have a good day.

:-)