TRUNK Port : what is connected ?

[CERKYR]

Hello,

I search the command to know what is connected on a TRUNK port (it could be also a ACCESS port).
I need to know the IP address.

(Catalyst 2960-X / 9200L / 9300)

Regards,

[balaji.bandi]

what is connected ?

if the cisco device you can do cdp neighbour - if the end device you need to identify with mac vendor lookup.

The access port is easy - 

show mac address-table [address mac-address] [dynamic | multicast | static] [interface {ethernet slot/port | port-channel number}] [vlan vlan-id]

Then match the MAC address with IP

show ip arp | in xxxx.xxxx.xxxxx (mac address)

For the Trunk - if they are many VLAN in the Trunk allowed list -  you need to trace based on the mac learning from Trunk or port-channel, go to the switch and do as suggested above process to get IP address ? (Layer 2 you get MAC address, Layer 3 you get IP address)

make sense?

[CERKYR]

using with : 

ping all the IP address known, from the switch, to fill the ARP Table.

show mac address-table | include Gi1/0/27

[CERKYR]

The proposal is not exactly what I need.
The need is to know what is the other switch (IP,MAC, HOSTNAME) connected on Trunk Port .

[CERKYR · Accepted solution]

I plan to enable CDP on all the cisco Switchs.

#Conf t

(config)#cdp run

(config)#do wr mem

(config)#end

#show cdp neighbors

[balaji.bandi · Accepted solution]

this what I had to suggest in my original reply

if the cisco device you can do cdp neighbour