tcpdump to see what you are getting from the switch
This is a nice tcpdump command line to see what you are getting from the switch as far as duplex and speed tcpdump -nn -vvv -s 1500 -c 1 -i eth0 ‘ether[20:2] == 0x2000’ For linux the output should look like tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 1500 bytes 08:13:11.630525 snap 0:0:c:20:0 CDP v2, ttl: 180s, checksum: 692 (unverified) Device-ID (0x01), length: 9 bytes: ‘SWITCH1’ Version String (0x05), length: 190 bytes: Cisco IOS Software, CBS30X0 Software (CBS30X0-LANBASE-M), Version 12.2(25)SEF1, RELEASE SOFTWARE (fc3) Copyright (c) 1986-2006 by Cisco Systems, Inc. Compiled Tue 23-May-06 15:26 by antonino Platform (0x06),… Continue Reading