I have a 3550 I am trying to configure OSPF and get :Unknown routing protocol"
Ususally means the image does not support ospf.
Do I need an image upgrade?
Cisco Internetwork Operating System Software
IOS (tm) C3550 Software (C3550-I9Q3L2-M), Version 12.1(22)EA6, RELEASE SOFTWARE
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Fri 21-Oct-05 02:12 by yenanh
Image text-base: 0x00003000, data-base: 0x006CF240
ROM: Bootstrap program is C3550 boot loader
Switch uptime is 20 minutes
System returned to ROM by power-on
System image file is "flash:c3550-i9q3l2-mz.121-22.EA6.bin"
cisco WS-C3550-48 (PowerPC) processor (revision E0) with 65526K/8192K bytes of m
Processor board ID CHK0631V3E9
Last reset from warm-reset
Running Layer2/3 Switching Image