Cisco Router

指令

• ​Administrative Commands
• 啟用/停用 privileged commands

  enable           Turn on privileged commands
  disable          Turn off privileged commands
  

  RTR> enable 
  Password: 
  RTR#
  

• ​Show Commands
• 顯示 CPU 使用狀態

  RTR# show processes cpu ?       
    autoprofile  Show processes cpu autoprofile information
    extended     Show last 5 sec extended process cpu usage information
    history      Show CPU history in graph format
    monitor      show CPU utilization continuously
    platform     Show platform CPU utilization per process
    sorted       Show sorted output based on percentage of utilization
    |            Output modifiers
    <cr>
  

  • Show CPU history in graph format

    RTR# show processes cpu history
    

  • 範例輸出

          554344333343334543333333334335433343433333333233233333334333633333434344
      100                                                                       
       90                                                                       
       80                                                                       
       70                                                                       
       60                                                                       
       50                                                                       
       40                                                                       
       30                                                                       
       20                                                                       
       10 **             *             *                              *         
         0....5....1....1....2....2....3....3....4....4....5....5....6....6....7..
                   0    5    0    5    0    5    0    5    0    5    0    5    0  
                       CPU% per hour (last 72 hours)
                      * = maximum CPU%   # = average CPU%
    

• 顯示記憶體用量 - ​https://www.cisco.com/c/en/us/td/docs/routers/access/4400/troubleshooting/memorytroubleshooting/isr4000_mem.pdf

  RTR#show platform resources 
  **State Acronym: H - Healthy, W - Warning, C - Critical                                             
  Resource                 Usage                 Max             Warning         Critical        State
  ----------------------------------------------------------------------------------------------------
  RP0 (ok, active)                                                                               C    
   Control Processor       21.18%                100%            90%             95%             H    
    DRAM                   3819MB(99%)           3857MB          90%             95%             C    
  ESP0(ok, active)                                                                               H    
   QFP                                                                                           H    
    DRAM                   95492KB(36%)          262144KB        80%             90%             H    
    IRAM                   213KB(10%)            2048KB          80%             90%             H   
  

• 顯示目前的完整設定

  RTR# show running-config ?
    aaa            Show AAA configurations
    all            Configuration with defaults
    bridge-domain  Show running bridge domain
    brief          configuration without certificate data
    class-map      Show class-map information
    flow           Global Flow configuration subcommands
    full           full configuration
    identity       Show identity profile/policy information
    interface      Show interface configuration
    linenum        Display line numbers in output
    map-class      Show map class information
    mdns-sd        Show mDNS-SD configurations
    partition      Configuration corresponding a partition
    policy-map     Show policy-map information
    service-group  Show running service-group
    view           View options
    vlan           Show L2 VLAN information
    vnet           Show Virtual NETwork aware configuration
    vrf            Show VRF aware configuration
    |              Output modifiers
    <cr>
  

• 顯示 Log

  RTR# show logging ?
    count       Show counts of each logging message
    dram        Show DRAM ECC errors
    history     Show the contents of syslog history table
    onboard     onboard information
    persistent  Show the contents of the logging persistent
    uptime      Show board uptime data
    xml         Show the contents of XML logging buffer
    |           Output modifiers
    <cr>
  

configure        Enter configuration mode

RTR#configure ?
  confirm            Confirm replacement of running-config with a new config file
  memory             Configure from NV memory
  network            Configure from a TFTP network host
  overwrite-network  Overwrite NV memory from TFTP network host
  replace            Replace the running-config with a new config file
  revert             Parameters for reverting the configuration
  terminal           Configure from the terminal
  <cr>

• ​https://supportforums.cisco.com/t5/network-infrastructure-documents/how-to-configure-logging-in-cisco-ios/ta-p/3132434

監控：SNMP OID

• ​How to Collect CPU Utilization on Cisco IOS Devices Using SNMP
• ​CPU and Memory SNMP trap switch
• ​CPU and memory utilization Object IDs (OIDs) NPM can poll

問題排查 Troubleshooting

• ​Memory Troubleshooting Guide for Cisco 4000 Series ISRs