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client ip address

Posted on 2012-04-13
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Last Modified: 2012-04-13
If i am working on a cisco switch (layer 2 or layer 3) and i have a client ip address is it possible to figure out what switch access port that client is connected to?

Here is what i know:
1)  i can do this with a mac-address
2)  i can determine what vlan and associated ports are assigned to that vlan

thanks!
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Question by:bryanord
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Anuroopsundd earned 500 total points
ID: 37842194
https://learningnetwork.cisco.com/thread/10600

show arp | inc 10.1.1.1
Internet  10.1.1.1               150   0022.90b7.b4f6  ARPA   FastEthernet0/0

 Note, the above interface is the layer 3 (router) interface, you still have to find it on a L2 switch
 switch#show mac address-table | inc 0022.90b7.b4f6

  1    0022.90b7.b4f6    DYNAMIC     Fa0/16
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LVL 17

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by:James H
ID: 37842247
To view VLAN and port assignments:

sh vlan brief

This will output all VLAN's and associated ports.
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Author Closing Comment

by:bryanord
ID: 37842255
SPOT ON!  thanks for the fast response.
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