interface input error

https://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html#wp1020996

原先目標是抓interface crc error，這值如果持續產生有很大機率是線材的問題，

結果目標設備不支援，只好改抓input error，input error 的原因則較多了，

Includes runts, giants, no buffer, CRC, frame, overrun, and ignored counts. Other input-related errors can also cause the input error count to be increased, and some datagrams may have more than one error; therefore, this sum may not balance with the sum of enumerated input error counts.

runts, giants, no buffer, CRC, frame, overrun, and ignored都是input error原因之一，

但這些數量總合不會等於input error，因為封包發生錯誤也許原因不只一種。

What IOS command will show the TCP ports that are listening on a device?

https://supportforums.cisco.com/discussion/11255361/what-ios-command-will-show-tcp-ports-are-listening-device

 show control-plane host open-ports

Converting Cisco IOS Configurations to Cisco IOS XR Configurations

http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.5/xr12000_conversion/reference/guide/cnv_r35.pdf


IOS XR 在global config 模式設定完要下commit去執行、儲存指令，

沒有下commit要離開也會問你是否要保留此設定，沒有copy run start了。

BGP Maximum-Prefix

http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a008010a28a.shtml

clear ip bgp neighbor_ip (restart the session)