Cisco – Automatic Port Updating via CDP

Manually updating port descriptions is a drag!

Copy-Pasta the following into your terminal:

event manager applet auto-update-port-description authorization bypass
description "Auto-update port-description based on CDP neighbor info"
event neighbor-discovery interface regexp .*GigabitEthernet.* cdp add
action 0.0  comment "Event line regexp: Deside which interface to auto-update description on"
action 1.0  comment "Verify CDP neighbor to be Switch or Router"
action 1.1  regexp "(Switch|Router|AIR)" "$_nd_cdp_capabilities_string"
action 1.2  if $_regexp_result eq "1"
action 2.0  comment "Trim domain name"
action 2.1  regexp "^([^\.]+)\." "$_nd_cdp_entry_name" match host
action 3.0  comment "Convert long interface name to short"
action 3.1  string first "Ethernet" "$_nd_port_id"
action 3.2  if $_string_result eq "7"
action 3.21 string replace "$_nd_port_id" 0 14 "Gi"
action 3.3  elseif $_string_result eq 10
action 3.31 string replace "$_nd_port_id" 0 17 "Te"
action 3.4  elseif $_string_result eq 4
action 3.41 string replace "$_nd_port_id" 0 11 "Fa"
action 3.5  end
action 3.6  set int "$_string_result"
action 4.0  comment "Check old description if any, and do no change if same host:int"
action 4.1  cli command "enable"
action 4.11 cli command "config t"
action 4.2  cli command "do show interface $_nd_local_intf_name | incl Description:"
action 4.21 set olddesc ""
action 4.22 set olddesc_sub1 ""
action 4.23 regexp "Description: ([a-zA-Z0-9:/\-]*)([a-zA-Z0-9:/\-\ ]*)" "$_cli_result" olddesc olddesc_sub1
action 4.24 if $olddesc_sub1 eq "$host:$int"
action 4.25 syslog msg "EEM script did NOT change desciption on $_nd_local_intf_name, since remote host and interface is unchanged"
action 4.26 exit 10
action 4.27 end
action 4.3  cli command "interface $_nd_local_intf_name"
action 4.4  cli command "description $host:$int"
action 4.5  cli command "do write"
action 4.6  syslog msg "EEM script updated description on $_nd_local_intf_name from $olddesc to Description: $host:$int and saved config"
action 5.0  end
action 6.0  exit 1
end
  

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