Can anyone throw any light on this. I have a customer that has a 100Mbits/s leased line. One end connects to a Cisco 3750 switch and the other to Cisco 3550 switch, via the provider CPE. The problem is that the 3750 is reporting different packets tx and rx load and counters than the 3550. I realise that packet counters may differ as one switch may have been up longer than the other but surely rx and tx counters should roughly match - e.g. If the tx is 250/255 on the 3750 then the rx shold be the same on the 3550. There are no errors and both ends report being reliable. I am pretty sure the line is congested and the 3750 is correct therefore could this be a bug in the 3550 IOS. See below, I have changed the switch names for privacy:
Switch A
Switch_A>sh cdp ne
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
Switch_B
Gig 1/0/18 140 R S I WS-C3550- Gig 0/9
Switch_A>sh inte gigabitEthernet 1/0/18
GigabitEthernet1/0/18 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 9caf.ca99.fe12 (bia 9caf.ca99.fe12)
Description: UPLINK
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 250/255, rxload 38/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 37587
Queueing strategy: fifo
Output queue: 0/0 (size/max)
5 minute input rate 15263000 bits/sec, 5215 packets/sec
5 minute output rate 98140000 bits/sec, 8671 packets/sec
5536992504 packets input, 1429664206845 bytes, 0 no buffer
Received 11623350 broadcasts (8749852 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 8749852 multicast, 0 pause input
0 input packets with dribble condition detected
9590687886 packets output, 13844989663615 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
SWITCH B
Switch_B>sh cdp ne
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
Switch_A
Gig 0/9 174 R S I WS-C3750G Gig 1/0/18
Switch_B>sh inter gi0/9
GigabitEthernet0/9 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 000c.ce7d.a809 (bia 000c.ce7d.a809)
Description: UPLINK
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 0/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, link type is auto, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 2d20h
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
1982260761 packets input, 2024310630 bytes, 0 no buffer
Received 4816462 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 3302041 multicast, 0 pause input
0 input packets with dribble condition detected
1168494755 packets output, 1873130391 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 PAUSE output
0 output buffer failures, 0 output buffers swapped out
