[c-nsp] Load balancing on Portchan.

[mb at adv.gcomm.com.au]

Hi,

Have 2 100Mb eth ports in portchan, and 1 port seems to be doing all 
the receiving:

sh interfaces fastEthernet 0/1
FastEthernet0/1 is up, line protocol is up (connected)  Hardware is 
Fast Ethernet, address is f4ac.c17d.af83 (bia f4ac.c17d.af83)
  Description: FEC_TO_ESW01_P20
  MTU 1998 bytes, BW 100000 Kbit, DLY 100 usec,     reliability 
255/255, txload 165/255, rxload 217/255
...  5 minute input rate 85322000 bits/sec, 13875 packets/sec
  5 minute output rate 65048000 bits/sec, 12044 packets/sec

FastEthernet0/2 is up, line protocol is up (connected)  Hardware is 
Fast Ethernet, address is f4ac.c17d.af84 (bia f4ac.c17d.af84)
  Description: FEC_TO_ESW01_P21
  MTU 1998 bytes, BW 100000 Kbit, DLY 100 usec,     reliability 
255/255, txload 52/255, rxload 2/255
...
  5 minute input rate 871000 bits/sec, 229 packets/sec
  5 minute output rate 20396000 bits/sec, 3718 packets/sec


The portchan doesnt report any usage(reports packets/bytes etc just not 
data rate or tx/rx)) for some reason on the 3560(the 2950 does though)

#sh int port-channel 2
Port-channel2 is up, line protocol is up (connected)  Hardware is 
EtherChannel, address is f4ac.c17d.af84 (bia f4ac.c17d.af84)
  Description: FEC_TO_ESW01_BNE
  MTU 1998 bytes, BW 200000 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 unknown
  input flow-control is off, output flow-control is unsupported  
Members in this channel: Fa0/1 Fa0/2  ARP type: ARPA, ARP Timeout 
04:00:00
  Last input 16:49:20, output 00:00:00, output hang never
  Last clearing of "show interface" counters 16:31:53
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 670097
  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
     654778461 packets input, 542298725539 bytes, 0 no buffer
     Received 576270 broadcasts (124103 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 124103 multicast, 0 pause input
     0 input packets with dribble condition detected
     1141651151 packets output, 665041631494 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

...

Any suggestions on how to balance the traffic better?

switches are 3560+2950

Thanks in advance.

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