encapsulation dot1q is not working?, 2600 Cisco router

[jesserc68]

     I am trying to config a 2620 Cisco router to perform subintreface (F0/0.1) for Vlan Trunk Protocol, however when I try to configure the encapsulation dot1q, I continue to receive error massage with ^ symbol below the 'c' See below, the platform version is a 12.3(26) which should be acceptable to perform an (encapsulation dot1q). The Ethernet is a fast-Ethernet 10/100 port. I also try the ISL, I receive the same massage.

Can anyone suggest what could be the problem!! 

Thank you all!!!!!

Router#config t

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#int f0/0

Router(config-if)#no ip address

Router(config-if)#no shutdown

Router(config-if)#int f0/0.1

Router(config-subif)#encapsulation dot1q 1                     

^ % Invalid input detected at '^' marker. Router(config-subif)#

==================================================================================================== Router#show version

Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-I-M), Version 12.3(26), RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2008 by cisco Systems, Inc. Compiled Mon 17-Mar-08 15:23 by dchih ROM: System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1) Router uptime is 5 minutes System returned to ROM by power-on System image file is "flash:c2600-i-mz.123-26.bin" cisco 2620 (MPC860) processor (revision 0x600) with 28672K/4096K bytes of memory . Processor board ID JAD05440GAN (1508240486) M860 processor: part number 0, mask 49 Bridging software. X.25 software, Version 3.0.0. 1 FastEthernet/IEEE 802.3 interface(s) 1 Serial network interface(s) 32K bytes of non-volatile configuration memory. 8192K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

Router#

==================================================================================================

Router#sh flash

System flash directory:

File  Length  Name/status  

1  7754580  c2600-i-mz.123-26.bin [7754644 bytes used, 633960 available, 8388604 total]

8192K bytes of processor board System flash (Read/Write)

Router#

[Reza Sharifi]

Is this 10Mb interface? 

Dot1q is supported on fastethernet interfaces.

HTH

[Leo Laohoo]

Is this 10Mb interface?

No Reza it's a FastEthernet.

Besides, there's a particular IOS which allows  Ethernet interface on a 2600 router to support 802.1q trunking.  Don't remember which particular version.

[Reza Sharifi]

Hi Leo,

I think, you are talking about this IOS:

http://www.cisco.com/en/US/products/hw/routers/ps259/prod_bulletin09186a00800921e4.html

[Leo Laohoo]

Yes.  The only thing I remember was that it has to be on a "T" train.  But yes, I think it's this IOS version.

[MaxFowler1]

Does anyone know where I can find the IOS verison Cisco iOS-c2600-is-mz.121-18.bin???  I've looked everywhere, but am having a hard time finding it.

Thanks

[jesserc68]

Do you happen to know what IOS support the encapsulation dot1q? I follow the  link, Raze posted, however there wasn't no  specific IOS.

Jesse

[Leo Laohoo]

1.  Your router has a FastEthernet so it supports 802.1q outright.

2.  Your IOS is newer compared to the 12.2(2)T.

Can you try the command "encapsulation dot1q 30"?

[jesserc68]

Router(config)# Router(config)#int f0/0 Router(config-if)#no ip address Router(config-if)#no shutdown Router(config-if)#int f0/0.1 Router(config-subif)#encapsulation dot1q 30 ? % Unrecognized command Router(config-subif)#encapsulation dot1q 30                       ^ % Invalid input detected at '^' marker. Router(config-subif)# jesse

[Leo Laohoo]

Hey Reza,

I haven't played with the 2600 for 7 years but does Jesse here need a "T" train?

[George Stefanick]

I have a 2621 and its Version 12.3(13) and I can sub interface with no problems...

its even older

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)

ROM: C2600 Software (C2600-IK9O3S3-M), Version 12.3(13), RELEASE SOFTWARE (fc2)

[George Stefanick]

Did you enable ip routing ... ? I wonder if that has something to do with it ...

[jesserc68]

I'm not sure about enable ip routing, what is the config or procedure?

Jesse

[George Stefanick]

Do a config t ip routing

If the command takes, then try your sub interfaces.. If it doesnt work, you need the IP code as pointed out above.

[jesserc68]

Here it once more, this is better then the one before

Router(config)#

Router(config)#int f0/0

Router(config-if)#no ip address

Router(config-if)#no shutdown

Router(config-if)#int f0/0.1

Router(config-subif)#encapsulation dot1q 30 ?

% Unrecognized command

Router(config-subif)#encapsulation dot1q 30  

^ % Invalid input detected at '^' marker.

Router(config-subif)#

Jesse