Hello All. I may be trying to fix something that isn't broke, but here goes :
I have 2 access switches, both 6500's - Sup 720's, connected by gig fiber, trunked. Switch A is our LAN switch, while Switch B is in our server room. A is connected to the router and the rest of the world. Switch A's interface to the server room is seeing quite a few output drops. I guess saying the phrase "quite a few" is a misnomer, as the total amount of drops rarely ever rises over .009%, but it is still no zero :
Switch A
GigabitEthernet6/2 is up, line protocol is up (connected)
Hardware is C6k 1000Mb 802.3, address is 0014.a982.2ddd (bia 0014.a982.2ddd)
Description: Downlink to Server Room
MTU 9216 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 18/255, rxload 115/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is SX
Media-type configured as SFP connector
input flow-control is off, output flow-control is off
Clock mode is auto
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:56, output 00:00:26, output hang never
Last clearing of "show interface" counters 06:42:56
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 20857
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 451178000 bits/sec, 41116 packets/sec
5 minute output rate 71836000 bits/sec, 17933 packets/sec
770120728 packets input, 1009314634174 bytes, 0 no buffer
Received 152334 broadcasts (32024 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
426544861 packets output, 288985375916 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
Switch B
GigabitEthernet6/1 is up, line protocol is up (connected)
Hardware is C6k 1000Mb 802.3, address is 001a.a22d.77a4 (bia 001a.a22d.77a4)
Description: Uplink to 6509
MTU 9216 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 80/255, rxload 19/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is SX
input flow-control is off, output flow-control is off
Clock mode is auto
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:04, output 00:00:00, output hang never
Last clearing of "show interface" counters 06:52:10
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 45630
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 77422000 bits/sec, 15313 packets/sec
5 minute output rate 316287000 bits/sec, 29672 packets/sec
433879867 packets input, 293048152751 bytes, 0 no buffer
Received 279794 broadcasts (171938 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
786365110 packets output, 1031587587444 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
None of the scientific data in the vlans is real-time/time sensitive that passes over the trunk. We don't have any extra fiber to create an etherchannel between them, but that is coming. Should I worry about the congestion? I ask because we will start to ramp it up in about 3 months. Are there any tuning suggestions anyone wishes to point me to? If it isn't broke, I won't try and fix it.
Thanks
Poirot
