= Cisco Router =

== 指令 ==

* [https://www.cisco.com/c/en/us/td/docs/server_nw_virtual/2-5_release/command_reference/admin.html Administrative Commands]
* 啟用/停用 privileged commands
{{{
enable           Turn on privileged commands
disable          Turn off privileged commands
}}}
{{{
RTR> enable 
Password: 
RTR#
}}}
* [https://www.cisco.com/c/en/us/td/docs/server_nw_virtual/2-5_release/command_reference/show.html 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 ==

* [https://www.cisco.com/c/en/us/support/docs/ip/simple-network-management-protocol-snmp/15215-collect-cpu-util-snmp.html How to Collect CPU Utilization on Cisco IOS Devices Using SNMP]
* [https://supportforums.cisco.com/t5/network-management/cpu-and-memory-snmp-trap-switch/td-p/1660177 CPU and Memory SNMP trap switch]
* [https://support.solarwinds.com/Success_Center/Network_Performance_Monitor_(NPM)/CPU_and_memory_utilization_Object_IDs_(OIDs)_NPM_can_poll CPU and memory utilization Object IDs (OIDs) NPM can poll]

== 問題排查 Troubleshooting ==

* [https://www.cisco.com/c/en/us/td/docs/routers/access/4400/troubleshooting/memorytroubleshooting/isr4000_mem.html Memory Troubleshooting Guide for Cisco 4000 Series ISRs]