Greetings,
I have spent some time looking online and the forums and documents but have a few questions. We are in the middle of a migration of in-house software and have had some performance bottlenecks in HTTP requests between clients and hosts on different servers that route through a 2960g switch in a bridge with another an RSTP setup. While most of the issues have been resolved by repartitioning on the linux hosts and filers, I spent some time early on looking at the switch. I am a Gnu/Linux guy, and only recently got thrown into the switching when our comms group got retasked so bare with me.
The switchport is connected to a linux host running RHEL5u5 with a bonded interface in transmit load-balance, only on MAC is visible to the switch at any time, the switchport config is pretty basic, as the switch config:
!
interface GigabitEthernet0/28
description dx1
switchport mode access
spanning-tree portfast
I noticed that the txload and rxload are relatively small, and remain relatively small, however the Total output drops increments pretty fast and with regularity, I read most times this can be just fine for various reasons, but was wondering if there is a way to sniff which packets are dropped, or if that is what that stat is telling me. Is this something I should be concerned about, on the same hardware and setup running our legacy software the total output drops are 0-5, as opposed to across-the-board similar to the below on the new software, which does however use a lot more network traffic as it is more ESB/SOA based than the legacy software.
hsw1-awcn#show interfaces g0/28
GigabitEthernet0/28 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is e804.62b3.4c1c (bia e804.62b3.4c1c)
Description: dx1
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 7/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/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 never, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 163167301
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 4670000 bits/sec, 1793 packets/sec
5 minute output rate 29639000 bits/sec, 2992 packets/sec
40329003402 packets input, 19801050808406 bytes, 0 no buffer
Received 1330378 broadcasts (79 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 79 multicast, 0 pause input
0 input packets with dribble condition detected
54443241034 packets output, 55818849960705 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
We don't have any QoS setup, but was wondering also what the below is telling me, or if it is an issue;
hsw1-awcn#show platform port-asic stats drop GigabitEthernet0/28
Interface Gi0/28 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 115263540
Here is some other output from the switchport that might be of use to someone with more knowledge than I.
hsw1-awcn#show interfaces g0/28 counters
Port InOctets InUcastPkts InMcastPkts InBcastPkts
Gi0/28 19801847031738 40331456565 79 1330324
Port OutOctets OutUcastPkts OutMcastPkts OutBcastPkts
Gi0/28 55820903755360 54134963247 298941448 13486895
hsw1-awcn#show interfaces g0/28 counters err
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards
Gi0/28 0 0 0 0 0 163167306
Port Single-Col Multi-Col Late-Col Excess-Col Carri-Sen Runts Giants
Gi0/28 0 0 0 0 0 0 0
hsw1-awcn#sh mls qos maps cos-output-q
Cos-outputq-threshold map:
cos: 0 1 2 3 4 5 6 7
------------------------------------
queue-threshold: 2-1 2-1 3-1 3-1 4-1 1-1 4-1 4-1
hsw1-awcn#show mls qos maps dscp-output-q
Dscp-outputq-threshold map:
d1 :d2 0 1 2 3 4 5 6 7 8 9
------------------------------------------------------------
0 : 02-01 02-01 02-01 02-01 02-01 02-01 02-01 02-01 02-01 02-01
1 : 02-01 02-01 02-01 02-01 02-01 02-01 03-01 03-01 03-01 03-01
2 : 03-01 03-01 03-01 03-01 03-01 03-01 03-01 03-01 03-01 03-01
3 : 03-01 03-01 04-01 04-01 04-01 04-01 04-01 04-01 04-01 04-01
4 : 01-01 01-01 01-01 01-01 01-01 01-01 01-01 01-01 04-01 04-01
5 : 04-01 04-01 04-01 04-01 04-01 04-01 04-01 04-01 04-01 04-01
6 : 04-01 04-01 04-01 04-01
hsw1-awcn#show interfaces g0/28 switching
GigabitEthernet0/28 dx1
Throttle count 0
Drops RP 0 SP 0
SPD Flushes Fast 0 SSE 0
SPD Aggress Fast 0
SPD Priority Inputs 0 Drops 0
Protocol Path Pkts In Chars In Pkts Out Chars Out
Other Process 0 0 2132504 128043660
Cache misses 0
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Spanning Tree Process 0 0 10465630 627937800
Cache misses 0
Fast 0 0 0 0
Auton/SSE 0 0 0 0
CDP Process 0 0 354589 146047840
Cache misses 0
Fast 0 0 0 0
Auton/SSE 0 0 0 0
hsw1-awcn#show interfaces g0/28 stats
GigabitEthernet0/28
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 0 0 12999502 956834048
Route cache 0 0 0 0
Total 0 0 12999502 956834048
hsw1-awcn#show queueing interface g0/28
Interface GigabitEthernet0/28 queueing strategy: none
Transmit GigabitEthernet0/28 Receive
1763188559 Bytes 3735544227 Bytes
3812006753 Unicast frames 3727259303 Unicast frames
406848156 Multicast frames 32316 Multicast frames
43306196 Broadcast frames 27011280 Broadcast frames
0 Too old frames 1844580102 Unicast bytes
0 Deferred frames 6268671 Multicast bytes
0 MTU exceeded frames 1884695228 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 0 Undersize frames
0 5 collision frames 0 Collision fragments
0 6 collision frames
0 7 collision frames 2440117432 Minimum size frames
0 8 collision frames 2187857298 65 to 127 byte frames
0 9 collision frames 3488687700 128 to 255 byte frames
0 10 collision frames 1591178981 256 to 511 byte frames
0 11 collision frames 2555603644 512 to 1023 byte frames
0 12 collision frames 80792437 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 1 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
1181878413 64 byte frames 0 Valid frames, too small
3009065386 127 byte frames
3273911113 255 byte frames 0 Too old frames
1981929200 511 byte frames 0 Valid oversize frames
3554245931 1023 byte frames 0 System FCS error frames
4146032950 1518 byte frames 0 RxPortFifoFull drop frame
0 Too large frames
0 Good (1 coll) frames
0 Good (>1 coll) frames
hsw1-awcn#show mls qos interface g0/28
GigabitEthernet0/28
QoS is disabled. When QoS is enabled, following settings will be applied
trust state: not trusted
trust mode: not trusted
trust enabled flag: ena
COS override: dis
default COS: 0
DSCP Mutation Map: Default DSCP Mutation Map
Trust device: none
qos mode: port-based
