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1. 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 WSC3560G-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:
6K
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2. 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 suboptions:
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:
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3. 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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