We have a switch that is behaving wierdly. All are manually set
for 100Mb/s Full-Duplex.
proxy-switch#show int fa0/3
FastEthernet0/3 is up, line protocol is up
Hardware is Fast Ethernet, address is 0009.433c.3003 (bia 0009.433c.3003)
Description: News Server
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s <==============
This switch is running (C3550-I5Q3L2-M), Version 12.1(8)EA1b.
root@news root# mii-tool -v
eth0: 100 Mbit, full duplex, link ok
product info: Intel 82555 rev 4
basic mode: 100 Mbit, full duplex
basic status: link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
link partner: 100baseTx-HD <========= Half-duplex?
We ran "mii-tool -v" on all the servers connected to this switch,
and received the same results, although "show int fa0/nn" on the switch
shows Full-Duplex.
So we now went to a different switch running (C2950-C3H2S-M), Version
12.0(5.4)WC(1) and tried the same thing and it works fine:
root@otis root# mii-tool -v
eth0: 100 Mbit, full duplex, link ok
product info: Intel 82555 rev 4
basic mode: 100 Mbit, full duplex
basic status: link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
So back to the 3550 switch. We did a "shut/no shut" on this switch
fa0/3, after which mii-tool returned the proper link-partner results.
Is there some negotiation bug in 3550s?
Thanks,
Hank
