Solved

Can't Encapsulate ISL in configuration for VLANs

Posted on 2008-10-16
4
466 Views
Last Modified: 2011-09-20
I have a 3745 router (IOS = 12.2 (13)T that is not functioning and I have a 3725 (IOS = 12.2. (8)T5) which I am configuring to replace the 3745.  When I configure a VLAN on the interface the encapsulate command returns an invalid character error. I can only guess after many retries that the problem lies with the difference in the IOS versions since the encapsulation works with the 3745.  Any help would be appreciated.
0
Comment
Question by:stancrfc
4 Comments
 
LVL 8

Expert Comment

by:MrJemson
ID: 22738034
Could you please cut and paste the exact command you are trying to implement and the error associated?
0
 
LVL 11

Accepted Solution

by:
packetguy earned 500 total points
ID: 22738801
I don't believe the 3725 supports ISL. Cisco phased that out of its products years ago, due to the interaction problems I caused with the nonproprietary 802.1Q encapsulation.
0
 
LVL 11

Expert Comment

by:donmanrobb
ID: 22742813
I would just just dot1q as there isn't much difference. If you require all frames to be tagged you can use the vlan dot1q tag native command
0
 

Author Closing Comment

by:stancrfc
ID: 31507045
I found that I had the wrong feature set for ISL
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Question about trunk (between Core switch and 3750 stack) channel mode ?? 6 23
EIGRP Summary 2 47
Vlan to Vlan communication 9 81
Some issue on SecurityCRT 5 25
Problem Description:   Couple of months ago we upgraded the ADSL line at our branch office from Home to Business line. The purpose of transforming the service to have static public IP’s. We were in need for public IP’s to publish our web resour…
In the hope of saving someone else's sanity... About a year ago we bought a Cisco 1921 router with two ADSL/VDSL EHWIC cards to load balance local network traffic over the two broadband lines we have, but we couldn't get the routing to work consi…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

861 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now