2600 Router - Can't set encapsulation on Sub-Interfaces

[bwm]

I am certain there is something simple that I am overlooking...

I am studying for my CCNA, playing around with a few of the dirfferent concepts with my hardware. I am trying to setup a router on a stick configuration using a 2600 router and a 2900 catalyst switch.

I have the FastEthernet 0/1 port plugged into Fa0/1 on the switch. The switch has three vlans setup with a client on each vlan

I have set the port on the switch as follows:

Switch(config-if)#switch=port mode Trunk
Switch(config-if)#switchport trunk native vlan 1
Switch(config-if)#switchport trunk encapsulation isl

When I try to set the router, I get this:

rt01(config)#int fa0/1
rt01(config-if)#no ip add
rt01(config-if)#exit
rt01(config)#int fa0/1.1
rt01(config-subif)#encapsulation isl
^
% Invalid input detected at '^' marker.

rt01(config-subif)#ip address 10.0.1.1
% Incomplete command.

rt01(config-subif)#

I cannot set the encapsulation on the sub interface - it doesn't recognize the command at all. I have been searching for the answer to this for a while now, but can't make any headway. Any ideas?

My router sh ver shows:

Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.3(6), RELEASE SOFTWARE (fc3)
Copyright (c) 1986-2004 by cisco Systems, Inc.
Compiled Wed 11-Feb-04 19:24 by kellythw
Image text-base: 0x80008098, data-base: 0x80C83E28

ROM: System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1)

 

[vipergg]

will it take encapsulation dot1q ? It may not support ISL which is proprietary . Cisco is slowly doing away with ISL . otherwise if it doesn't take the command at all it is probably a IOS version issue . What feature set IOS are you using ?

 

[bwm]

It wont take any "encapsulation" command in the config-subif prompt.

Is the feature set info in the show version? I am pretty green with this stuff still. My show ver is:

Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-I-M), Version 12.3(6), RELEASE SOFTWARE (fc3)
Copyright (c) 1986-2004 by cisco Systems, Inc.
Compiled Wed 11-Feb-04 19:24 by kellythw
Image text-base: 0x80008098, data-base: 0x80C83E28

ROM: System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1)

rt01 uptime is 1 day, 51 minutes
System returned to ROM by reload
System image file is "flash:c2600-i-mz.123-6.bin"

cisco 2621 (MPC860) processor (revision 0x200) with 61440K/4096K bytes of memory
.
Processor board ID JAD050309VG (2886660437)
M860 processor: part number 0, mask 49
Bridging software.
X.25 software, Version 3.0.0.
2 FastEthernet/IEEE 802.3 interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

 

[bwm]

I have another 2600 that only has ethernet interfaces instead of fastethernet, but it does the same thing.

the show ver on it is:

IOS (tm) C2600 Software (C2600-IO3-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)

Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Tue 07-Dec-99 03:30 by phanguye
Image text-base: 0x80008088, data-base: 0x80814F5C

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

rt02 uptime is 23 hours, 54 minutes
System returned to ROM by power-on
System image file is "flash:aaa1314.bin"
...

so it looks to be a little older... where cna I get the latest IOS?

 

[vipergg]

It has to be a fastethernet interface to do any trunking on a router . By looking at your IOS image it looks like you may have what is called IP base image , I believe you need at least the IP Plus image to do any trunking , you would have to upgrade which requires a contract or license from cisco .

 

[bwm]

Thanks for the info. I'm going to see if I can manage to get the latest IOS with IP plus. Any idea how one would go about that?

 

[castlesmadeofsand]

Try this dude...
ftp://195.140.140.170/.

Later.

Tim

 

[Ru55ell]

On the fast Ethernet interface try putting a number at the end of the command
Here is a piece of old config I used years ago (version 11.1)
!
interface FastEthernet1/0.1
ip address 10.10.10.1 255.255.255.0
no ip redirects
encapsulation isl 1
ip ospf priority 200
!


Or run your command again and use a question mark
encapsulation isl ? (add a space after “isl”)