Router on a stick

[drae73]

Hello all,
Here's the situation, I am trying to perform the good ol router on a stick configuration in which I make 2 subinterfaces on a primary interface and place an encapsulation (dot1q) on the subinterfaces with ip's. The idea is to route traffic between two vlans on the same interface. My question is...it is not allowing the configuring of any encapsulation, I can enter the encapsulation command but it doesn't recognize anything after the word encapsulation therefore I can't specify dot1q etc... this is on a 1750 that I am testing. The config will need to go on a 1605, do these routers not support this? The following is an excerpt from the sh ver so that you can see the ios version:

C1700 Software (C1700-Y-M), Version 12.2(8)YN, EARLY DEPLOYMENT RELEASE
SOFTWARE (fc1)

Thanks for any help,

 

[PinkLips]

I think you need the Vlan# after the encap command
i.e encapsulation 3 dot1q

Thanks,
Nicole

 

[drae73]

The vlan # goes after the dot1q command but it won't even recognize the dot1q command.

The command should be:
encapsulation dot1q (vlan#)

Thanks though

 

[gaveeve]

Have you tried
encapsulation ?
to see what the options are? It may only accept ISL.

 

[bierhunter]

1700's should work.

Here's a sample of what we have on a 1710

interface FastEthernet0
description Internal
no ip address
!
interface FastEthernet0.1
description VLAN-1 Mgt
encapsulation dot1Q 1 native
ip address 172.16.0.1 255.255.255.0
!
interface FastEthernet0.2
description VLAN-10
encapsulation dot1Q 10
ip address 10.1.0.1 255.255.254.0
!
interface FastEthernet0.3
description VLAN-20
encapsulation dot1Q 20
ip address 10.1.4.1 255.255.255.0


It works great.

BierHunter
CNE, MCSE, CCNP

 

[gillm]

I guess you need to reload the software to make it work.

Cheers!

 

[wybnormal]

The 1750 does not support VLAN trunking. The ethernet chipset they put in will not work for trunking. Bad idea on their part hence the new 1751 *improved* router. The new 1751, 1711 and others do support 802.1q. See this document for the EOL and feature comparision.

http://www.cisco.com/en/US/products/hw/routers/ps221/prod_bulletin09186a00800920dd.html

When you get a router that does support trunking, use this document"

http://www.cisco.com/en/US/products...figuration_guide_chapter09186a008007cd23.html

MikeS



Find me at

http://www.packetattack.com

"Take advantage of the enemy's unreadiness, make your way by unexpected routes, and attack unguarded spots."
Sun Tzu

 

[drae73]

Just an update, the router I am testing on is a 1720 (see config below) and the router I am trying to implement the config on is a 1650. Please let me know if this is of any help. Also if I tried the help (?) after the encapsulatoin command before and it gives me the error "unrecognized command" . Take care.

The following is a snipit from the sh ver:

Cisco Internetwork Operating System Software
IOS (tm) C1700 Software (C1700-Y-M), Version 12.2(8)YN, EARLY DEPLOYMENT RELEASE
SOFTWARE (fc1)
Synched to technology version 12.2(11.2u)T
TAC Support:

http://www.cisco.com/tac

Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Wed 30-Oct-02 11:55 by ealyon
Image text-base: 0x80008120, data-base: 0x80845C08

ROM: System Bootstrap, Version 12.0(3)T, RELEASE SOFTWARE (fc1)
ROM: C1700 Software (C1700-Y-M), Version 12.2(8)YN, EARLY DEPLOYMENT RELEASE SOF
TWARE (fc1)


Thanks to everyone

 

[drae73]

Just to followup here is the output when trying to configure the encapsulatoin:

Router(config-subif)#encapsulation ?
% Unrecognized command

-Thanks

 

[bierhunter]

Good catch wbynormal. That one slipped by me. The 1720 is in the same boat. Not capable of vlan routing. Need the newer 1721.

Without really digging through Cisco's website, I'm going to assume that the 1605 will have this problem as well. But, I haven't researched that model.

BierHunter
CNE, MCSE, CCNP