I have two identical Layer 3 switches, running identical Cisco IOS Versions. One of the switches, I can configure with ipv6. The other switch however, tells me "Unrecognized command" when I try any ipv6 commands. This includes commands inside a Vlan interface, and not just ipv6 general settings.
Good Switch:
ns-sw03#conf t
Enter configuration commands, one per line. End with CNTL/Z.
ns-sw03(config)#ipv6 ?
access-list Configure access lists
cef Cisco Express Forwarding for IPv6
dhcp Configure IPv6 DHCP
general-prefix Configure a general IPv6 prefix
hop-limit Configure hop count limit
host Configure static hostnames
icmp Configure ICMP parameters
local Specify local options
mld Global MLD Snooping enable for Catalyst Vlans
nd Configure IPv6 ND
neighbor Neighbor
ospf OSPF
prefix-list Build a prefix list
route Configure static routes
router Enable an IPV6 routing process
source-route Process packets with source routing header options
traffic Configure traffic parameters
unicast-routing Enable unicast routing
Bad Switch:
ns-sw04#conf t
Enter configuration commands, one per line. End with CNTL/Z.
ns-sw04(config)#ipv6 ?
% Unrecognized command
The obvious answer to the question is "Your switch does not support the IPv6 Feature Set", but this doesn't make any sense because the firmware and IOS are identical on both switches.
Good Switch:
ns-sw03#show version
Cisco IOS Software, ME340x Software (ME340x-METROIPACCESSK9-M), Version 12.2(54)SE, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Tue 13-Apr-10 00:47 by prod_rel_team
Image text-base: 0x01000000, data-base: 0x02E00000
ROM: Bootstrap program is ME340x boot loader
BOOTLDR: ME340x Boot Loader (ME340x-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)
ns-sw03 uptime is 1 year, 40 weeks, 3 days, 9 hours, 19 minutes
System returned to ROM by power-on
System restarted at 03:44:43 CEST Sat Jul 9 2011
System image file is "flash:me340x-metroipaccessk9-mz.122-54.SE/me340x-metroipaccessk9-mz.122-54.SE.bin"
Bad Switch:
ns-sw04#show version
Cisco IOS Software, ME340x Software (ME340x-METROIPACCESSK9-M), Version 12.2(54)SE, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Tue 13-Apr-10 00:47 by prod_rel_team
Image text-base: 0x01000000, data-base: 0x02E00000
ROM: Bootstrap program is ME340x boot loader
BOOTLDR: ME340x Boot Loader (ME340x-HBOOT-M) Version 12.2(44)SE5, RELEASE SOFTWARE (fc1)
ns-sw04 uptime is 1 year, 40 weeks, 3 days, 9 hours, 16 minutes
System returned to ROM by power-on
System restarted at 03:46:15 CEST Sat Jul 9 2011
System image file is "flash:me340x-metroipaccessk9-mz.122-54.SE/me340x-metroipaccessk9-mz.122-54.SE.bin"
What have I missed?
Best Answer
I hope you're in a position to be able to reload the switch:
sdm prefer dual [default|routing|vlan]
and then
reload
, you should be good to go. Obviously this impacts the TCAM so doshow sdm pref
to make sure available resources reflect what you're going to need. I'd go withdefault
unless you need to run a lot of IP routes.Basically, IPv6 is only visible and enabled if the dual-stack SDM profile is selected.