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#

[jesserc68]

I just spoke with a friend and they are well to get the IOS C2600-is-mz.123-26.bin, once I implement the new IOS I will let you all know.

Thanks

Jesse

[xyra_basilio]

Hi, 

May we know if C2600-is-mz.123-26.bin fixed the issue and allowed the router subinterface for encapsulation?

Thanks

JB

[Nawaf Al.Mutairi]

So the problem is the IOS version ..!

I'm going to inform my IT group about it

Because we are going to make a lab with routers and switches

I found this post useful somehow

Sent from Cisco Technical Support iPhone App

[debnathgayatri]

I have the same error on the cisco 2612 router, version is 12.1(19).

[rythem007]

hi guys,

good news

i solved this problem

it also work on ethernet port

i thought it will be issue of cisco ios version,so i tried many ios 

apart from all i got this ios is working for me of cisco2611xm router

check yours.best of luck

Cisco iOS-c2600-is-mz.121-18.bin

my email is ridhammayani007@gmail.com

if you need IOS or further help contact me