[pingz]

Mikrotik-->EX4550-->(Оператор у которого берем канал сеть MPLS)-->S3756F-->Mikrotik

 

sh version
BDCOM(tm) S3756F Software, Version 2.2.0C Build 44299
Copyright by Shanghai Baud Data Communication CO. LTD.
Compiled: 2017-7-10 10:5:8 by SYS, Image text-base: 0x80008000
ROM: System Bootstrap, Version 0.4.3, Serial num:20014054237
System image file is "Switch.bin"
hardware version:V1.0
(RISC) processor with 524288K bytes of memory, 16384K bytes of flash
Base ethernet MAC Address: 84:79:73:5f:7d:22
snmp info:
  product_ID:306   system_ID:1.3.6.1.4.1.3320.1.306.0
 

sh interfac gigaEthernet 0/48
GigaEthernet0/48 is up, line protocol is up
  Ifindex is 64, unique port number is 48
  Description: MANAGEMENT
  Hardware is Giga-FX, address is 8479.735f.7d52 (bia 8479.735f.7d52)
  MTU 1700 bytes, BW 1000000 kbit, DLY 10 usec
  Encapsulation ARPA
  Auto-Duplex(Full),  1000Mb/s,  Flow-Control Off
  5 minutes input rate 271200133 bits/sec, 26309 packets/sec
  5 minutes output rate 39128703 bits/sec, 12400 packets/sec
  peak input rate 1027062104 bits/sec, Jan  1 00:10:29
  peak input rate 153427 packets/sec, Jan  1 00:15:56
  peak output rate 1027370432 bits/sec, Jan  1 00:05:49
  peak output rate 128118 packets/sec, Jan  1 00:22:30
     Received 378881903 packets, 457037642130 bytes
     179743 broadcasts, 378690813 ucasts  11346 multicasts
     0 FCS, 0 PAUSE  0 jabber, 0 jumbo
     0 undersize, 0 collision
     0 error, 0 allignment
     0 overrun, 24348108 oversize
     0 63B packets, 36400430 64B packets
     25672434 65B~127B packets, 3953580 128B~255B packets
     3642711 256B~511B packets, 6453521 512B~1023B packets
     24348108 good 1519B packets, 0 bad 1519B packets
     Transmitted 193872228 packets, 99381241367 bytes
     2731 broadcasts, 193864322 ucasts  5173 multicasts
     0 FCS, 0 jumbo 0 underrun
     0 63B packets, 37964657 64B packets
     78285441 65B~127B packets, 7924784 128B~255B packets
     3407317 256B~511B packets, 10846783 512B~1023B packets
     2843104 good 1519B packets
 

Растут oversize при mtu 1500 

 

 

sh system mtu
System MTU size is 1700 bytes

[pingz]

Если понизить на микротиках MTU до 1490 ошибок нет

[alexdirty]

Чем закончилась история? А то похожая проблема (как будто чисто косметическая), но только на BDCOM OLT GP3600 (на 4х и 8ми портовых). Растёт тысячами, но проблем нет и 1500 норм проходит. Правда мне не проверить уменьшением MTU сверху.

[Nikita Devyatyarov]

По информации от BDCOM:

no matter the size of MTU u configurate

if the packet size is over 1500 , it should be oversize packet