“Line Cards Power Down due to Communication Failures（因通信故障而关闭线卡电源）”故障排除指南

简介

本文档介绍如何对因Cisco Catalyst 6500系列交换机通信故障而断电的线卡进行故障排除。

先决条件

要求

本文档没有任何特定的要求。

使用的组件

本文档中的信息基于Cisco Catalyst 6500系列交换机，不限于特定软件版本。

本文档中的信息都是基于特定实验室环境中的设备编写的。本文档中使用的所有设备最初均采用原始（默认）配置。如果您使用的是真实网络，请确保您已经了解所有命令的潜在影响。

背景信息

安全复制协议(SCP)是用于从交换机处理器(SP)通过Catalyst 6500上的以太网带外通道(EOBC)到非分布式转发卡（非DFC）线卡通信的协议。SCP或保持连接轮询故障可能代表管理引擎和线卡之间的通信问题。

当模块断电时，请执行以下检查：

• 查看日志以确定模块是否因“SCP dnld”故障而关闭。
• 排除主控引擎和有问题的线卡之间的通信故障。

查看日志

检查日志以查看“SCP dnld”或保持连接轮询故障是否是模块断电的原因：

%C6KPWR-SP-4-DISABLED: power to module in slot 2 set off (Module Failed SCP dnld)
%C6KPWR-SP-4-DISABLED: power to module in slot 2 set off (Module not responding to 
   Keep Alive polling)

通信故障排除

此程序介绍如何排除Supervisor与线卡之间的通信故障。

1. 检查SP端的全局SCP计数器是否存在任何递增错误。
   
   

   6500#remote command switch show scp counters
   6500-sp# 
   received packets            = 586786 
   transmitted packets         = 584442 
   retransmitted packets       = 13        (increasing re-transmissions indicate 
                                            congested EOBC) 
   loop back packets           = 0 
   transmit failures           = 0         (increasing transmit failures indicate 
                                            congested/stuck EOBC) 
   recv pkts not for me        = 0 
   recv pkts to dead process   = 0 
   recv pkts not enqueuable    = 0         (increasing counters indicate lack of 
                                            EOBC buffers) 
   response has wrong opcode   = 0 
   response has wrong seqnum   = 0
   response is not an ack      = 0 
   response is too big         = 0

2. 检查每个模块的SCP接收/传输计数器，并检查SCP重试次数是否增加。
   
   

   6500#remote command switch show scp status
   6500-sp# 
   Rx 586786 ,  Tx 584442 ,  Sap 15 
   Id     Channel name    current/peak/retry/total  time(queue/process) 
   -- ------------------- ------------------------  ------------------- 
   0  SCP async: LCP#8     0/ 11/  1/   13            4/   4 
   1  SCP async: LCP#4     0/ 13/  0/  550           92/ 108 
   2  SCP async: LCP#2     0/ 34/  0/ 1540          628/ 456 
   3  SCP async: LCP#5     0/ 17/  1/  716         2228/1252 
   4  SCP async: LCP#1     0/ 29/  0/  137          200/ 452 
   5  SCP async: LCP#9     0/ 13/  0/  895          176/ 428 

3. 检查从管理引擎到相关模块的SCP ping。
   
   

   6500#remote command switch test scp ping 3
   6500-sp# 
   pinging addr 5(0x5) 
   assigned sap 0x11 
   addr 5(0x5) is alive       (Communication between the supervisor and line 
                               card is fine)
   
   6500#remote command switch test scp ping 2
   6500-sp# 
   pinging addr 11(0xB) 
   assigned sap 0x11 
   no response from addr 11(0xB)  (Communication between the supervisor 
                                   and linecard is broken)

4. 在线卡上配置在线诊断。
   
   

   6500(config)#diagnostic level complete      (12.1(8a)EX or above)

5. 重新拔插线卡，并查看测试结果，以查看是否有测试失败。
   
   

   6500#show diagnostic result module 2 
   Current Online Diagnostic Level = Complete
   Online Diagnostic Result for Module 2 : PASS 
   Online Diagnostic Level when Module 2 came up = Complete

6. 可选：使用debug命令检查SCP下载事件。当线路卡联机时，可以运行这些调试来检查SCP下载事件。这是模块正常运行的示例。
   
   

   6500#remote login switch
   6500-sp#debug scp download module 2
   6500-sp#show debug
   <snip>
   SCP download debugging for slot 2 is on
         start_timer_online_action: Start OIR online timer for slot: 2, 
            time: 1380 sec
        scp_dnld_module 2 : 0 : 0: during state enabled, got event 5(registered)
    @@@ scp_dnld_module 2 : 0 : 0: enabled -> wait_til_boot_ready
    Stop timer
    Start BOOT_RDY timer for 2 with 30000 msec
        scp_dnld_module 2 : 0 : 0: during state wait_til_boot_ready, got event 
           6(boot_ready)
    @@@ scp_dnld_module 2 : 0 : 0: wait_til_boot_ready -> wait_til_downloaded
    Stop timer
    Start DNLD timer for 2 with 120 sec
    (scp_start_download) 2/0
    (scp_start_download) 2/0: Started D/L Process, pid 512
    get_card_image: slot/proc 2/0: UBIN patch image on flash opened 
       (microcode:/LCP_CPGBIT)
    No download needed for card at slot 2
   
        scp_dnld_module 2 : 0 : 0: during state wait_til_downloaded, got event 
           4(dnld_completed)
    @@@ scp_dnld_module 2 : 0 : 0: wait_til_downloaded -> wait_til_ready
    Stop timer
    Start EXEC_CODE timer for 2 with 90 sec
    Received Run-ready from slot 2
    scp_download_process_teardown() mypid 512, slot/proc 2/0, image_fd -1
        scp_dnld_module 2 : 0 : 0: during state wait_til_ready, got event 
           8(ready)
    @@@ scp_dnld_module 2 : 0 : 0: wait_til_ready -> wait_til_running
    Stop timer
    Start RUN_RDY timer for 5 with 90 sec
        scp_dnld_module 2 : 0 : 0: during state wait_til_running, got 
           event 9(running)
    @@@ scp_dnld_module 2 : 0 : 0: wait_til_running -> wait_til_online
    Stop timer
   <snip>