• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 510
  • Last Modified:

Can't Encapsulate ISL in configuration for VLANs

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
stancrfc
Asked:
stancrfc
1 Solution
 
MrJemsonCommented:
Could you please cut and paste the exact command you are trying to implement and the error associated?
0
 
packetguyCommented:
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
 
donmanrobbCommented:
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
 
stancrfcAuthor Commented:
I found that I had the wrong feature set for ISL
0

Featured Post

The new generation of project management tools

With monday.com’s project management tool, you can see what everyone on your team is working in a single glance. Its intuitive dashboards are customizable, so you can create systems that work for you.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now