Hi all
Does anybody have any experience of compatibility issues between a Cisco
switch and a 3Com switch? We have a 3548 connected to a 3Com SuperStack II
Desktop Switch. The link is manually set up as 100MB full duplex, and a show
interface on the 3548 shows a large number of CRC errors, but no collisions.
Reading various docs, I believe that this would normally be caused by
excessive noise.
The 3Com was set up for a forwarding state of Fast Forward, and after 3
hours of monitoring yesterday I changed it to Store and Forward. Before it
was changed there were 700 CRC errors within the 3 hours, and after I
changed it, there were only 30 errors in the next 3 hours.
There are clients connected to the 3Com switch that are having the odd
connection problem, but if the are moved directly onto the 3548, they no
longer get problems. I thought perhaps the errors may be due to excessive
traffic, but if you look at the 2 interface stats below, one port has more
traffic than the other, but less CRC errors:
GS-3548-01#sh int f0/2
FastEthernet0/2 is up, line protocol is up
Hardware is Fast Ethernet, address is 0003.e35c.8242 (bia
0003.e35c.8242)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters 02:48:26
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 5000 bits/sec, 5 packets/sec
5 minute output rate 36000 bits/sec, 12 packets/sec
142908 packets input, 22151873 bytes
Received 2932 broadcasts, 0 runts, 0 giants, 0 throttles
32 input errors, 32 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 30 multicast
0 input packets with dribble condition detected
207125 packets output, 70760794 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
GS-3548-01#sh int f0/7
FastEthernet0/7 is up, line protocol is up
Hardware is Fast Ethernet, address is 0003.e35c.8247 (bia
0003.e35c.8247)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters 02:48:29
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 1000 bits/sec, 1 packets/sec
5 minute output rate 7000 bits/sec, 6 packets/sec
53844 packets input, 9100547 bytes
Received 2293 broadcasts, 0 runts, 0 giants, 0 throttles
53 input errors, 53 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 5 multicast
0 input packets with dribble condition detected
108913 packets output, 37215109 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
I have tried using Sniffer Pro and Observer to gather stats, but neither
show any errors (possibly due to my NIC card not set up properly?)
Any advice/help given would be most appreciated.
Regards
Shaun
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