sub interfaces and vlans

Some 10mb ethernet interfaces do provide support for 802.1q. I do not think
the 2503 supports this. However I do believe that the 2610 with a > 12.2T
IP Plus IOS will support this. You will need to change the encapsulation to
802.1q to allow you to create and use sub interfaces.

 

["slipstream_242"]

| can sub interfaces only be created on fastethernet ports?

No, there are a *few* Cisco routers which can create 802.1q subinterfaces
on 10 Mbps Ethernet ports. 2503 is not one of them, probably not 2610
either.

| I have tried this
| on a 2503 and a 2610 and get a message saying that ip routing is only
| allowed when configuring a sub interface as part of vlan configuration.

Yes, it means you need "encapsulation dot1q <vlan-id>" before you can
configure IP routing on the subinterface.

Steinar Haug, Nethelp consulting,

 

Hiya all.

I`m trying to configure sub interfaces on my router but it doesn't seem to
want to know. I think I know what the problem is but would like to know if I
am right or not.

can sub interfaces only be created on fastethernet ports? I have tried this
on a 2503 and a 2610 and get a message saying that ip routing is only
allowed when configuring a sub interface as part of vlan configuration.

The ICND book I am working from shows the interface as fastethernet but the
ones on both of my routers are normal Ethernet and not fastethernet

Any help would be appreciated.

Gordon

 

2610's can do it just fine.



hsb

"Somehow I imagined this experience would be more rewarding" Calvin
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IIRC, you need a + image, as well as being new enough. I think you
probably need a T train image in the 12.2 line for it.

 

there must be some sort of IOS revision required, on my 2610 which has
12.2(5d) the only e command under the sub interface is exit.

 

I thought you needed a 100M interface, but perhaps this is IOS dependent.

 

Some 10mb int can support it.