Hey You need to run Enterprise Basic IOS image for IS-IS. Here is the output of show ver on a 2620 in my lab:
2620A#sh ver Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-J1S3-M), Version 12.3(1a), RELEASE SOFTWARE (fc1) Copyright (c) 1986-2003 by cisco Systems, Inc. Compiled Fri 06-Jun-03 22:08 by dchih Image text-base: 0x80008098, data-base: 0x819BDAE0 ROM: System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1) 2620A uptime is 0 minutes System returned to ROM by power-on System image file is "flash:c2600-j1s3-mz.123-1a.bin" cisco 2620 (MPC860) processor (revision 0x600) with 61440K/4096K bytes of memory **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
