Hi!
Situation:
I got a Cisco 1841 router with HWIC-4ESW module that's connected to a Catalyst 2960 switch through a trunk link. Both connected interfaces have equal settings (duplex full and speed 100, MTU set as default).
On the switch: "sh interfaces fastEthernet 0/1 counters errors" showing increase in the numbers of undersized frames received by switch:
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize
Fa0/1 0 0 0 0 520
On the switch :"sh interfaces fastEthernet 0/1 controller"
FastEthernet0/1 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 0017.0ef8.9c83 (bia 0017.0ef8.9c83)
Description: trunk to 1841 Fa0/0
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, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
________________________________________________
Transmit FastEthernet0/1 Receive
47325749 Bytes 118224174 Bytes
192797 Unicast frames 115621 Unicast frames
2025 Multicast frames 58934 Multicast frames
2045 Broadcast frames 3309 Broadcast frames
0 Too old frames 111149330 Unicast bytes
0 Deferred frames 4081197 Multicast bytes
0 MTU exceeded frames 211776 Broadcast bytes
0 1 collision frames 0 Alignment errors
0 2 collision frames 0 FCS errors
0 3 collision frames 0 Oversize frames
0 4 collision frames 33710 Undersize frames
0 5 collision frames 0 Collision fragments
0 6 collision frames
0 7 collision frames 12566 Minimum size frames
0 8 collision frames 60372 65 to 127 byte frames
0 9 collision frames 27747 128 to 255 byte frames
0 10 collision frames 6032 256 to 511 byte frames
0 11 collision frames 4243 512 to 1023 byte frames
0 12 collision frames 66904 1024 to 1518 byte frames
0 13 collision frames 0 Overrun frames
0 14 collision frames 0 Pause frames
0 15 collision frames
0 Excessive collisions 0 Symbol error frames
0 Late collisions 0 Invalid frames, too large
0 VLAN discard frames 0 Valid frames, too large
0 Excess defer frames 0 Invalid frames, too small
62571 64 byte frames 33710 Valid frames, too small
100777 127 byte frames
On the router some commands run without any errors.
I test both interfaces on half-duplex (and _ or ) 10Mbps but unsuccessful. I try to connect switch to other interface on HWIC but undersized frames counter still increase in the number. And, of course, I try to use other UTP path. All unsuccessful.
Any idea about the problem ?
Best regards.
Andrey Babkin
