How to Enable IPv6 Support on a Cisco Cisco 3560X Switch?

Which ios will support IPv6 feature in WS-C3560G-48TS switch? I am having WS-

C3560G-48TS switch with ios (c3560-ipbasek9-mz.122-58.E2.bin) and I am trying to use

IPv6 feature in this switch model. More over I’ve upgraded this switch with many ios but

none of them not supporting IPv6 feature. Could somebody please suggest me an ios

which supports IPv6 feature?

How to enable ip v6 for 3750/3560 switch? We have 3750G and 3650G with IOS rel

12.2(50) SE3. According to Cisco document, these switches should support IP v4 and v6

dual-stack configuration (after 12.2SE). I have searched many Cisco IP v6 online help,

but cannot figure out how to enable this feature. Such as, I tried to configure an interface

with IP v6 addr, but it will not take “ip v6″ or “ipv6″.

—Two questions from Cisco Support Community.

If you have tried configuring IPv6 on a Cisco 3560 switch, you may have noticed the ipv6

commands aren’t available by default. This often catches us when we are working on a

new switch that has never had IPv6 enabled.

Here we listed a brief how-to with some background info thrown in by a typical Cisco

3560 user.

Where the IPv6 are Commands Hiding?

Cisco 3560 switches have a feature called Switch Database Management (SDM)

templates. There are various templates that can modify the allocation of system

resources to better support different features. What does this mean? By default, a small

catalyst switch is built to support 8 routed interfaces and 1024 VLANs. It’s not generally

used to route OSPFv3 and BGP (though, it can do that). So as a result, the system

resources are evenly distributed among the various functions to accommodate a

common set of tasks.

My guess is since IPv6 addresses take up more space than IPv4 addresses, they were

excluded from the default template to maximize v4 space. However, I would imagine

future IOS releases will enable IPv6 support by default as it becomes more prevalent.

You can see the current SDM settings with the show sdm prefer command:

S1#show sdm prefer

The current template is “desktop 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: 6K1

number of IPv4 IGMP groups + multicast routes: 1K

number of IPv4 unicast routes: 8K

number of directly-connected IPv4 hosts: 6K

number of indirect IPv4 routes: 2K

number of IPv4 policy based routing aces: 0

number of IPv4/MAC qos aces: 0.75K

number of IPv4/MAC security aces: 1K

To see the list of available SDM templates, go to config mode and type sdm prefer? You

can see dual stack ipv4/ipv6 support is one of the templates.

S1(config)#sdm prefer ?

access Access bias

default Default bias

dual-ipv4-and-ipv6 Support both IPv4 and IPv6

ipe IPe bias

routing Unicast bias

vlan VLAN bias

So, if you try to configure an IPv6 address on an interface without enabling the correct

SDM, you get nothing:

S1(config-if)#ipv6 ?

% Unrecognized command

How do I enable IPv6 support on a Cisco 3560 switch?

To enable IPv6 support on the Cisco 3560 switch, you simply change the SDM template

and reload. Start by enabling the dual-ipv4-and-ipv6 template with one of three sub-

options:

S1(config)#sdm prefer dual-ipv4-and-ipv6 ?

default Default bias

routing Unicast bias

vlan VLAN bias

As you can see, you can decide to give more resources to routing or more to vlans when

enabling IPv6 support. Since I’m using this switch in a lab to practice IPv6 routing

protocols, I’m going to select the routing bias.

S1(config)#sdm prefer dual-ipv4-and-ipv6 routing

Changes to the running SDM preferences have been stored, but cannot take effect

until the next reload.

Use ‘show sdm prefer’ to see what SDM preference is currently active.

After a reload, here’s the resulting template change:2

S1#show sdm prefer

The current template is “desktop IPv4 and IPv6 routing” 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: 1.5K

number of IPv4 IGMP groups + multicast routes: 1K

number of IPv4 unicast routes: 2.75K

number of directly-connected IPv4 hosts: 1.5K

number of indirect IPv4 routes: 1.25K

number of IPv6 multicast groups: 1.125k

number of directly-connected IPv6 addresses: 1.5K

number of indirect IPv6 unicast routes: 1.25K

number of IPv4 policy based routing aces: 0.25K

number of IPv4/MAC qos aces: 0.75K

number of IPv4/MAC security aces: 0.5K

number of IPv6 policy based routing aces: 0.25K

number of IPv6 qos aces: 0.5K

number of IPv6 security aces: 0.5K

And now if you try to configure an IPv6 address on an interface, the command will show

up:

S1(config-if)#ipv6 address ?

WORD General prefix name

X:X:X:X::X IPv6 link-local address

X:X:X:X::X/<0-128> IPv6 prefix

autoconfig Obtain address using autoconfiguration

S1(config-if)#ipv6 address dead:beef:cafe::1/64

Finally, don’t forget to enable IPv6 unicast-routing globally if you want IPv6 packets to be

forwarded.

S1(config)#ipv6 unicast-routing

Note: All command line output is from a 3560 running 12.2(44) SE.

Link to Cisco.com Reference:

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/relea…

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