03-15-2010 10:55 AM - edited 03-06-2019 10:08 AM
Hi
we have a 3560 PoE switch and in one of the interface i am seeing more traffic ..how to find the ip address of the device connected to that interface
Karthik
Solved! Go to Solution.
03-15-2010 11:01 AM
karthikgopi wrote:
Hi
we have a 3560 PoE switch and in one of the interface i am seeing more traffic ..how to find the ip address of the device connected to that interface
Karthik
Karthik
It's a two step process.
1) On the 3560 switch enter this "sh mac-address-table interface
2) On the L3 switch/router responsible for routing for the vlan that the device is in -
"sh arp | include
Note the 3560 may or may be doing the routing for the vlan.
Jon
03-15-2010 11:09 AM
Karthik
It might help us to give a better answer if we knew whether your switch was acting as purely a layer 2 switch or whether you have configured it as a layer 3 switch and it is routing between VLANs.
Without knowing that I will phrase my answer in general terms so that it might apply to both situations.
First you should determine whether there is a single device connected on that switch port or whether there are multiple devices connected to that switch port. To do this execute the command show mac address-table interface
Then you go to the device that is the default gateway for the subnet contained in the VLAN of the switch interface.
On the device that is the default gateway execute the command show arp. Look in the output for the MAC address from the switch interface and the IP address associated with the MAC address is the source of the traffic.
HTH
Rick
03-15-2010 02:23 PM
The command "sh ip arp
03-15-2010 11:01 AM
karthikgopi wrote:
Hi
we have a 3560 PoE switch and in one of the interface i am seeing more traffic ..how to find the ip address of the device connected to that interface
Karthik
Karthik
It's a two step process.
1) On the 3560 switch enter this "sh mac-address-table interface
2) On the L3 switch/router responsible for routing for the vlan that the device is in -
"sh arp | include
Note the 3560 may or may be doing the routing for the vlan.
Jon
03-15-2010 02:23 PM
The command "sh ip arp
03-15-2010 11:09 AM
Karthik
It might help us to give a better answer if we knew whether your switch was acting as purely a layer 2 switch or whether you have configured it as a layer 3 switch and it is routing between VLANs.
Without knowing that I will phrase my answer in general terms so that it might apply to both situations.
First you should determine whether there is a single device connected on that switch port or whether there are multiple devices connected to that switch port. To do this execute the command show mac address-table interface
Then you go to the device that is the default gateway for the subnet contained in the VLAN of the switch interface.
On the device that is the default gateway execute the command show arp. Look in the output for the MAC address from the switch interface and the IP address associated with the MAC address is the source of the traffic.
HTH
Rick
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