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 Post subject: Too large frames
Post #1 Posted: 19 Dec 2016, 14:36 
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wannabe
wannabe

Joined: 01 Sep 2014, 10:46
Posts: 122
Witam
Czy to może być przyczyną dropów?

140690872 Valid frames, too large
Wiem, że w statystykach nie ma dropów, ale to mi się nie do końca podoba.

Code:
show interfaces gigabitEthernet 1/0/13 controller
GigabitEthernet1/0/13 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is ece1.a901.5f0d (bia ece1.a901.5f0d)
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:02, output 00:00:07, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 52000 bits/sec, 56 packets/sec
  5 minute output rate 303000 bits/sec, 189 packets/sec
     300589944 packets input, 313341501037 bytes, 0 no buffer
     Received 7591964 broadcasts (6920391 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 6920391 multicast, 0 pause input
     0 input packets with dribble condition detected
     536676524 packets output, 89057725343 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 unknown protocol drops
     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

     Transmit GigabitEthernet1/0/13           Receive
   3158427026 Bytes                       4103860829 Bytes
    461024414 Unicast frames               292998037 Unicast frames
     22048307 Multicast frames               6920393 Multicast frames
     53604018 Broadcast frames                671573 Broadcast frames
            0 Too old frames               908205173 Unicast bytes
            0 Deferred frames             1929827347 Multicast bytes
            0 MTU exceeded frames           64623665 Broadcast bytes
            0 1 collision frames                   0 Alignment errors
            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                   0 Minimum size frames
            0 8 collision frames            41997784 65 to 127 byte frames
            0 9 collision frames            37264880 128 to 255 byte frames
            0 10 collision frames           18285075 256 to 511 byte frames
            0 11 collision frames            8653971 512 to 1023 byte frames
            0 12 collision frames           53697421 1024 to 1518 byte frames
            0 13 collision frames                  0 Overrun frames
            0 14 collision frames                  0 Pause frames
            0 15 collision frames
            0 Excessive collisions                 0 Symbol error frames
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames          140690872 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
       547295 64 byte frames                       0 Valid frames, too small
    444316250 127 byte frames
     43144933 255 byte frames                      0 Too old frames
     19936580 511 byte frames                      0 Valid oversize frames
      1634327 1023 byte frames                     0 System FCS error frames
     15699572 1518 byte frames                     0 RxPortFifoFull drop frame
     11397782 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames


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 Post subject: Re: Too large frames
Post #2 Posted: 19 Dec 2016, 14:51 
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CCIE
CCIE

Joined: 17 Dec 2010, 15:23
Posts: 721
Location: Dublin
Zerknij an http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/12027-53.html

Pozdro,


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 Post subject: Re: Too large frames
Post #3 Posted: 19 Dec 2016, 14:54 
Online
wannabe
wannabe

Joined: 01 Sep 2014, 10:46
Posts: 122
hehe troszkę nie ta seria:D
tutaj mam 2960X albo 2960S

i jest opis do invalid frames, a ja mam valid frames ale, że za duża jest:p


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 Post subject: Re: Too large frames
Post #4 Posted: 19 Dec 2016, 15:03 
Offline
wannabe
wannabe
User avatar

Joined: 16 Nov 2004, 13:55
Posts: 1661
Location: Edinburgh
Cos nadaje Jumbo Frames? Ale dropów nie masz.

http://www.cisco.com/c/en/us/td/docs/sw ... _0110.html

_________________
Jeden konfig wart więcej niż tysiąc słów


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 Post subject: Re: Too large frames
Post #5 Posted: 19 Dec 2016, 15:08 
Online
wannabe
wannabe

Joined: 01 Sep 2014, 10:46
Posts: 122
najciekawsze, że to wygląda tak jakby sam przełącznik to robił, bo na żadnym porcie access tego nie ma..:/


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 Post subject: Re: Too large frames
Post #6 Posted: 19 Dec 2016, 16:41 
Offline
CCIE
CCIE

Joined: 17 Dec 2010, 15:23
Posts: 721
Location: Dublin
A co to za interface trunk czy access?

Bo jesli to trunk to dot1q dodaje extra 4 bytes. Nastepnie do tego dodaj sobie 6 bytes Dest MAC, 6 bytes Src MAC, 2 bytes Len/Type oraz 4 bytes dla CRS. W takim przypadku ramka bedzie miala 1522 bytes przy zalozeniu, ze MTU dla L3 jest 1500. Taka ramka po przekroczeniu 1518 bytes jest liczona jako baby giant pewnie dlatego widzisz to jako Valid frames, too large

Cisco mowi

Quote:
Standard Ethernet frame MTU is 1500 bytes. This does not include the Ethernet header and Cyclic Redundancy Check (CRC) trailer, which is 18 bytes in length, to make the total Ethernet frame size of 1518. Baby giant frames refer to Ethernet frame size up to 1600 bytes



Pozdro,


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