Router sub interface 1

[lobo66]

have a 2611 with dual eth 0/0 and eth 0/1

try to connect a trunk to eth 0/0 via a sub interface 0/0.1 but it will not allow me to ecap do1q, is this not possible on a eth int only on a fa port?

THX

 

[JOAMON]

I beleive your a correct in that dot1q will only work on fast ethernet port.

 

[lobo66]

you know of any work arounds for this?

 

[JOAMON]

Have some of those routers myself. Not found a work around for this. Our 2611 routers are scheduled to be replaced with Cisco 1841 ISR routers within the next 6 months. You could get a Cisco 3620 with a 2 port fast ethernet module on Ebay for a good price and that should do it. Have not tried it with that series of router and if you consider it then double check that it supports trunking before purchase. I know that the 1841 does though.

 

[JOAMON]

A cisco 2621 might also be a good choice as it has 2 on board fast ethernet ports.

 

[lobo66]

THX all have a 3660 I can use just setting up a test lab to the internet...

 

[jneiberger]

802.1Q trunk support became available in the 2611 with version 12.2T. If you can somehow find 12.2(15)T somewhere, you should be good to go.

 

[JOAMON]

Thanks for the info....tested on 2611 with 12.3(13) and it does indeed allow it.

 

[JOAMON]

I tried settin my 2611 to dot1q and the sub-interface accested the command. It is connected to a 2950 switch port and connot communicate with each other.

Switch
interface FastEthernet0/7
switchport mode trunk
switchport nonegotiate
speed 10
duplex full
mls qos trust cos
macro description cisco-router
spanning-tree portfast trunk
spanning-tree bpduguard enable

Router
interface ethernet0/1
no ip address
full-duplex
interface ethernet0/1.1
encapsulation dot1Q 1 native
ip address 192.168.26.28 255.255.255.0
no snmp trap link-status

IP of vlan 1 on switch is 192.168.26.34 255.255.255.0

 

[jneiberger]

What feature set are you using on the router?

 

[JOAMON]

System image file is "flash:c2600-ik9o3s3-mz.123-13.bin"
IP/FW/IDS PLUS IPSEC 3DES BASIC

 

[JOAMON]

Switch is WS-C2950-24 with:
C2950 EI AND SI IOS IMAGE
c2950-i6q4l2-mz.121-22.EA5a.bin

 

[JOAMON]

Is it possible that the following is the problem I am having:
The Cisco Catalyst 2950SX-48, 2950T-48, 2950SX-24, 2950-24 and 2950-12 switches (Figures 1-5) are available only with the Standard Image (SI) software for the Cisco Catalyst 2950 Series. They cannot be upgraded to the Enhanced Image (EI) software.

 

[robertjo24]

JOAMON,
The 2950 w/standard image should work just fine.

I know this sounds simple, and I apologize if this offfends, but did you issue a "no shut" on the int e0/1?

Did you try "no ip route-c" for the sub interface?

 

[JOAMON]

As you can see from the previous post the interfaces are not shutdown. No I did not try no ip route-c on the sub-interface but will do so.

 

[JOAMON]

no ip route-cache had no effect. Can see other devices via CDP but thats it.

 

[jneiberger]

I'm inclined to think that something else is wrong. A 2610/11 running 12.2 IP PLUS or better should support 802.1Q. I don't have any guesses as to what might be wrong, though.

 

[JOAMON]

Neither do I. Shutdown and removed sub-interface, apples IP to ethernet0/1 and work fine. Try to set trunking and nadda....wierd.

 

[jneiberger]

That is weird. I don't even have a guess. I'll let you know if I think of something. Is there trunk debugging available on either the router or the switch? Perhaps debugs might tell us why the trunk isn't working.

 

[jneiberger]

Did you have a native VLAN mismatch? Was that switchport in the correct VLAN before you made it a trunk?