On Mon, 27 Sep 2010, Deric Kwok wrote:
I have problem to create vlan in my router 28 serise.
I can create vlan database
1/ I can't use name command as "router(vlan)# name net1"
2/ I can't config t the vlan as "(config)#vlan 10 ===> % Invalid
input detected at '^' marker."
ls my router supporting vlan?
If you are running an IOS version that supports 802.1Q VLAN tagging, you
can create VLANs, but they behave differently on a router than on a
switch:
For example, on a router:
interface GigabitEthernet0/0/0
no ip address
interface GigabitEthernet0/0/0.100
description sub-interface for VLAN 100
encapsulation dot1q 100
ip address 10.10.100.1 255.255.255.0
interface GigabitEthernet0/0/0.200
description sub-interface for VLAN 200
encapsulation dot1q 200
ip address 10.10.200.1 255.255.255.0
You can shut down individual sub-interfaces if you need to, and as you'd
expect, shutting down the parent interface (Gig0/0/0 in this case) will
take down all of the sub-interfaces.
You need to pay attention to which VLAN you use as the native VLAN on
your trunk, and match it on the router by adding the "native" statement to
your subinterface encapsulation command. There are other things that need
to match up as well, such as the encapsulation type, especially if you're
still using something other than 802.1q. I'm not sure if ISL is even
supported anymore.
There are other important things to consider as well, such as which device
acts as the root bridge for the VLANs on the trunk.
There are lots of examples and documentation for configuring VLANs and
trunks on routers on Cisco's website.
jms
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