Interface load is high

Unanswered Question
Feb 9th, 2010

One of my 4500 switches connect to Citrix Netscaler Load Balancer, and showing a very high interface load 159/255.  Under normal condition, it shouldn't go above 50 at all, and trying to see what is the best way to troubleshoot and find the root cause for this issue.  The switch has (2) uplinks to (2) physical Netscalers for loadbalancing.

Switchport connection to Netscaler with heavy interface load

GigabitEthernet2/47 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet Port, address is 001d.4552.d00e (bia 001d.4552.d00e)
  Description: UPLINK TO Netscaler port 1/2
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 159/255, rxload 13/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000-TX
  input flow-control is on, output flow-control is on
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 212087966
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 52111000 bits/sec, 42352 packets/sec
  5 minute output rate 625503000 bits/sec, 61768 packets/sec
     37888017430 packets input, 6052796103723 bytes, 0 no buffer
     Received 1616483 broadcasts (0 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     55362465947 packets output, 68877278962723 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 output buffer failures, 0 output buffers swapped o

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Switchport connection to Netscaler with normal interface load

show int gigabitEthernet 2/45
GigabitEthernet2/45 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet Port, address is 001d.4552.d00c (bia 001d.4552.d00c)
  Description: UPLINK new (fiber) Netscaler port 1/2
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 42/255, rxload 3/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000-TX
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 359600
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 12780000 bits/sec, 9569 packets/sec
  5 minute output rate 165424000 bits/sec, 15433 packets/sec
     10235984920 packets input, 1868266300120 bytes, 0 no buffer
     Received 1532624 broadcasts (0 multicast)
     0 runts, 0 giants, 0 throttles
     481 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     16665191493 packets output, 21998085481721 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 output buffer failures, 0 output buffers swapped out

Any feedback will be appreciated.

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sachinraja Tue, 02/09/2010 - 13:38

HI Abbas

Have you made any changes to your network, or advertised more networks onto the load balancer link ? What kind of network management/netflow devices do you have in your network ? This is such a huge traffic, and from the show command, the output drops are huge..  do you see any unusual activity on the switch, on the "show proc cpu" or "show log" outputs ?

Regards

Raj

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