连续两次遇到，由于思科板卡的限制导致交换机端口流量跑不上去。第一次不知道，没想到这个原因还情有可原，但是第二次都没想到，就有点说不过去了，总结一下。

 第一次遇到，收集信息如下：

TX to an etherchannel will limit channel throughput to 1 Gbps!
Apr 27 18:49:28.159: %CAPI_EC-4-RATE_LIMITED: Adding interfaces on WS-X6148A-GE-


Apr 27 18:49:28.155: %CAPI_EC-4-RATE_LIMITED: Adding interfaces on WS-X6148A-GE-

TX to an etherchannel will limit channel throughput to 1 Gbps!

这是日志提示

show inter g4/1

GigabitEthernet4/1 is up, line protocol is up (connected)
  Hardware is C6k 1000Mb 802.3, address is xxx (bia xxx)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 20/255, rxload 187/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s
  input flow-control is off, output flow-control is off
  Clock mode is auto
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:27, output 00:00:19, output hang never
  Last clearing of "show interface" counters 01:43:32
  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 736548000 bits/sec, 60044 packets/sec
  5 minute output rate 80038000 bits/sec, 48702 packets/sec
  L2 Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes
  L3 in Switched: ucast: 0 pkt, 0 bytes - mcast: 0 pkt, 0 bytes mcast
  L3 out Switched: ucast: 0 pkt, 0 bytes mcast: 0 pkt, 0 bytes
     325101561 packets input, 524619806733 bytes, 0 no buffer
     Received 347 broadcasts (345 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 45774634 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     271077361 packets output, 56203757725 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 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
求助，解决如下：

2楼
wenwenaicj发表于 2010-4-27 21:22 | 只看该作者

It is related to an IOS bug, when u're configuring an EtherChannel on a WS-X6548-GE-TX module or a WS-X6548V-GE-TX module %CAPI_EC-4-RATE_LIMITED: Adding WS-X6548-GE-TX interfaces to an etherchannel will limit channel throughput to 1 Gbps! This problem is resolved in Release 12.2(18)SXF. (CSCsb16475)

3楼
tzcie发表于 2010-4-28 08:17 | 只看该作者

txload 20/255, rxload 187/255这个不太正常哦

alphakk发表于 2010-4-28 10:58 | 只看该作者

overrun是指接收方无法将收到的数据提交到缓冲区，也就是说对方发送的数据量已超出接收方处理能力。

fish100发表于 2010-4-28 23:53 | 只看该作者

LZ你是运行商,还是普通的企业用户啊? 5 minute input rate 736548000 bits/sec, 60044 packets/sec   5 minute output rate 80038000 bits/sec, 48702 packets/sec 流量这么大啊

6楼
yushuai发表于 2010-4-29 18:49 | 只看该作者

我的问题已经解决了 是因为6509 新插的板卡 WS-X6148A-GE-TX，的功能有问题，每8个端口最多跑到1G，也就是48个端口只能跑到最多6G。如果有更深入的解释，希望大家指教！

9楼
liyinghao发表于 2010-5-11 14:21 | 只看该作者

6148是老线卡，bus架构的，所以只能这样了。因为在那个时候，整个引擎也就32G。 6748是switch fabric架构，没有这个限制。

思科官网相关文档

 http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/hardware/Module_Installation/Mod_Install_Guide/02ethern.html#wp1042813

参考接口信息文档

http://www.cisco-club.com.cn/space-110565-do-blog-id-3053.html

 

第二次遇到，由于某些原因，交换机信息并未收集全

知道现象如下：

从3750升级到4507E交换机后，网络高峰期，网络丢包严重，延时很大。流量低是网络一切正常。更换了光纤，效果不是很明显。

后来集成商的技术中有经验的遇到过，知道是板卡的问题

WS-X4548-GB-SFP

www.cisco.com ---> support --->switch-->Error and System Messages ---> Hardware Documents --->

 http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/regulatory/compliance/78_13233.html

---->Module Overview and Specifications--->WS-X4448-GB-SFP--->see the "Configuring Gigabit Ethernet Ports" section on page 3-11.

--->查询思科官网文档如下：

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/module/guide/03instal.html#wp1037558

 

4500板卡http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps4324/product_data_sheet0900aecd801792b1.html#wp9000017

http://www.cisco.com/en/US/prod/collateral/modules/ps2797/ps6013/product_data_sheet0900aecd8017a0c5.html

4500 安装手册http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/catalyst4500e/installation/guide/01intro.html