[求助]怎么解讀這段LOG？

angelagod

昨天才發(fā)了篇“菜鳥日記”，心里還得意得很，哈哈，我也有經(jīng)驗了——誰想今天上午，營業(yè)廳HUB那段又掛了！

下面是覺得有問題的LOG：
Sep  9 08:36:14: %ETHCNTR-3-HALF_DUX_COLLISION_EXCEED_THRESHOLD: Half-duplex loopback detected, collision threshold exceeded on FastEthernet0/4.

Sep  9 08:36:14: %PM-4-ERR_DISABLE: loopback error detected on Fa0/4, putting Fa0/4 in err-disable state

HUB就是接在這個Fa0/4下面的，想請問一下各位大俠，這種Half-duplex loopback 錯誤一般是指什么？HUB下有環(huán)路？

wonderliang

顯示這個端口沖突過多，超過閥值，交換機將狀態(tài)設(shè)置為err-disable。
建議將HUB下的所有機器，手動設(shè)置為半雙工。

cnadl

sh ver
sh int f0/4

bingosek

cisco上的參考

1. Error Message   ETHCNTR-3-HALF_DUX_COLLISION_EXCEED_THRESHOLD: Collision at [chars] exceed threshold. Consider as loop-back.
   
2. 
   
3. Explanation   This message means that the collisions at a half-duplex port exceeded the threshold, and the port is considered as a loopback. [chars] is the port where the threshold was exceeded.
   
4. 
   
5. Recommended Action   No action is required. The port goes into error-disabled mode until the problem is resolved

復(fù)制代碼

還是show一下interface出來看看

angelagod

JD2950#sh int fas 0/4
FastEthernet0/4 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 000d.edd6.ebc4 (bia 000d.edd6.ebc4)
  Description: "link to YingyeTing-HUB"
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Half-duplex, 10Mb/s
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  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 0 bits/sec, 0 packets/sec
  5 minute ouxtput rate 0 bits/sec, 0 packets/sec
     102001 packets input, 16886134 bytes, 0 no buffer
     Received 3325 broadcasts, 0 runts, 0 giants, 0 throttles
     1 input errors, 0 CRC, 1 frame, 0 overrun, 0 ignored
     0 watchdog, 1820 multicast, 0 pause input
     0 input packets with dribble condition detected
     166587 packets output, 90982292 bytes, 0 underruns
     222 output errors, 922 collisions, 2 interface resets
     0 babbles, 1 late collision, 827 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

angelagod

output errors、collision、deferred都比較多，而且一直都在增長中。增長速度也并不是很瘋狂，但一直在增長中。

JD2950#sh clock
10:10:50.859 UTC Mon Sep 12 2005
JD2950#sh int fas 0/4
……
   224 output errors, 932 collisions, 2 interface resets
     0 babbles, 1 late collision, 847 deferred
……

過一分半鐘再查看一次
JD2950#sh clock
10:12:34.431 UTC Mon Sep 12 2005
JD2950#sh int fas 0/4
……
    225 output errors, 941 collisions, 2 interface resets
     0 babbles, 1 late collision, 859 deferred
……

已經(jīng)增長不少了

angelagod

而且很奇怪的是，我把HUB的uplink口拔掉，用其它終端的跳線接上去時，交換機那邊的端口燈竟然不亮！——原來接其它終端時，是亮的。

仿佛HUB只能經(jīng)：營業(yè)廳配線架1口——機房配線架10口——交換機 這樣的線路連上網(wǎng)絡(luò)。

換成其它單個終端用的：營業(yè)廳配線架3口——機房配線架12口——交換機，用這樣的線路，就不亮——也太沒天理了吧�。�！


打算今天下班后，拿手提、裝個SNIFFER去抓點包看看。但我本人對SNIFFER也是半桶水，抓下來還不一定看得懂。還望壇子里的大俠們繼續(xù)關(guān)注，多多幫忙，多給意見�。。。�

xliu

呵呵，關(guān)注中。

cnadl

sh ver？

超菜的魚

可能的原因很多
1 你的2950是水貨
2 cisco2950 的bug
3 過長或者過短的網(wǎng)線有可能導(dǎo)致這個問題
4 當初布線人員的水平  你能看到的是配線架到設(shè)備的線 但在走線槽鐘的線也很重要 測線路 有無強電干擾  線纜質(zhì)量 等等 。。。
5 把keepalive 消息 disable