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Вопрос по C3550

Добрый день!

 

Имеется WS-C3550-48 (c3550-ipservicesk9-mz.122-46.SE.bin), который соединен патчкордом с Edge-Core ES3528M.

Со стороны 3528M - SFP, со стороны 3550 - GBIC. 3550 в качестве L3 роутит 15 vlan'ов.

 

Наблюдается рост отклика проходящего через 3550 трафика с 0.5-1мс до 5-10мс. При этом на "аплинке" Gi 0/1 наблюдается такая картина:

 

#sh interfaces gigabitEthernet 0/1
GigabitEthernet0/1 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 000d.bd68.5c31 (bia 000d.bd68.5c31)
  Description: EDGECORE-1G
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 42/255, rxload 42/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 1000Mb/s, link type is force-up, media type is 1000BaseSX
  input flow-control is off, output flow-control is on
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:01, output 00:00:00, output hang never
  Last clearing of "show interface" counters 14w5d
  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 166037000 bits/sec, 27439 packets/sec
  5 minute output rate 165360000 bits/sec, 28320 packets/sec
     586688152 packets input, 958007710 bytes, 0 no buffer
     Received 37742128 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 38456659 ignored
     0 watchdog, 1361293 multicast, 0 pause input
     0 input packets with dribble condition detected
     2292900146 packets output, 1855456334 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 11817634 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

Растут:

38456659 ignored

11817634 PAUSE output

при

5 minute input rate 166037000 bits/sec, 27439 packets/sec

5 minute output rate 165360000 bits/sec, 28320 packets/sec

 

#sh controller ethernet-controller gigabitEthernet 0/1

  Transmit GigabitEthernet0/1        Receive
1403621187 Bytes                688155122 Bytes
2078441936 Unicast frames       553916708 Unicast frames
  76440603 Multicast frames       1262744 Multicast frames
143370555 Broadcast frames      36219244 Broadcast frames
         0 Discarded frames        297234 No dest, unicast
         0 Too old frames           98961 No dest, multicast
         0 Deferred frames         164593 No dest, broadcast
         0  1 collision frames
         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  452296833 Minimum size frames
         0  8 collision frames 1599039839 65 to 127 byte frames
         0  9 collision frames  472572638 128 to 255 byte frames
         0 10 collision frames 1736968854 256 to 511 byte frames
         0 11 collision frames 1690123696 512 to 1023 byte frames
         0 12 collision frames 1951257046 1024 to 1518 byte frames
         0 13 collision frames
         0 14 collision frames          0 Flooded frames
         0 15 collision frames   38467786 Overrun frames
         0 Excessive collisions      1584 VLAN filtered frames
         0 Late collisions              0 Source routed frames
         0 Good (1 coll) frames         0 Valid oversize frames
         0 Good(>1 coll) frames         0 Pause frames
  11821436 Pause frames                 0 Symbol error frames
         0 VLAN discard frames          0 Invalid frames, too large
         0 Excess defer frames          0 Valid frames, too large
         0 Too large frames             0 Invalid frames, too small
2433486837 64 byte frames      1318102956 Valid frames, too small
167069862 127 byte frames
3708440077 255 byte frames
1135957489 511 byte frames
1327615098 1023 byte frames
2115619470 1518 byte frames

Растут:

38467786 Overrun frames

11821436 Pause frames

1318102956 Valid frames, too small

 

Может у кого-то есть соображения, в чем может быть причина таких симптомов?

L3-функция на GE-интерфейсах в 3550 ведь не oversubscribed?

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А show proc cpu что говорит?

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flow control отключите на гиговом порту 3550, он таки его там поддерживает.

flowcontrol send off

 

и на ежгоре тоже.

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А show proc cpu что говорит?
Не загружен - от 1 до 5%

 

flow control отключите на гиговом порту 3550, он таки его там поддерживает.

flowcontrol send off

 

и на ежгоре тоже.

А вот это очень похоже на источник проблемы. Отключил на 3550 - пока нормально, жду роста трафика. На еже по умолчанию fc отключен.

 

 

 

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