LLDP and scripting - EEM

[jay_7301]

Hi All,

we have a lab network and different things are connected/re-connected/moved etc all the time.  We have 2960x switches that i want to enable lldp on this in because we have multi vendor devices connecting into them. 

I was hoping that when we enable lldp that the information like the hostname can be automatically updated to the port description on the 2960x - version universalk9-mz.150-2.EX5.bin?

if this is possible can you point me in the right direction on a script we can use?

Thanks

[MHM Cisco World]

From theory view you can, but I need to lab it to check.

[balaji.bandi]

CDP and LLDP are link layer protocols for directly-connected CDP/LLDP capable devices to advertise themselves and their capabilities

if this is possible can you point me in the right direction on a script we can use?

- what script you looking, Once you enabled based on LLDP device, you would like to change the port description ?

what if the device moved to differnt port - you looking to change weekly or daily basis this information ?

[Georg Pauwen]

Hello,

copy and paste this script:

event manager applet LLDP_UPDATE_PORT_DESCRIPTION authorization bypass
description "Auto-update port-description based on LLDP neighbor info"
event neighbor-discovery interface regexp .*GigabitEthernet[1-9]/[0-9]/[0-9]+$ lldp add
action 0.0 comment "Event line regexp: Decide which interface to auto-update description on"
action 1.0 comment "Verify LLDP neighbor to be Switch or Router"
action 1.1 regexp "(Switch|Router|AIR)" "$_nd_lldp_capabilities_string"
action 1.2 if $_regexp_result eq "1"
action 2.0 comment "Trim domain name"
action 2.1 regexp "^([^\.]+)" "$_nd_lldp_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 $_nd_local_intf_name | incl Description:"
action 4.21 set olddesc "<none>"
action 4.22 set olddesc_sub1 "<none>"
action 4.23 regexp "Description: ([a-zA-Z0-9:/\-]*)([a-zA-Z0-9:/\-\ ]*)" "$_cli_result" olddesc olddesc_sub1
action 4.24 if $olddesc_sub1 eq "$host:$int"
action 4.25 syslog msg "EEM script did NOT change description 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 LINK TO: $host:$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

[jay_7301]

sorry i should of been more clear. The model is - "WS-C2960XR-48TD-I"

does the config above still stand? if so please can you provide a high level of what this is doing for example how often is it checking the lldp output?

Thanks and appreciate your response.

[Georg Pauwen]

Hello,

the script would run every time a new neighbor sends an LLDP message.

I am not sure if that script can run on your 2960XR. Paste it in and see if you get any error messages...

[jay_7301]

thanks - i need to upgrade first as it's not taking the command.

[MHM Cisco World]

What command not accept?

[balaji.bandi]

EEM script needs to be run in each device if you looking to do this task - I would suggest making a python script and out of the box making automation.

EEM Script can be any device - you need to provide more evidence of what error you getting while you implement that commands, 

if you running first-time EEM script, suggest pasting line by line to capture the correct error and line number.