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Finding LAN Switch where a host with specific ip address is connected 1
- Thread starter sjova
- Start date
predamarcel
IS-IT--Management
depends about the switches (vendor/model)
On some of them are admin tools and you can search based on MAC address.
PM
On some of them are admin tools and you can search based on MAC address.
PM
- Thread starter
- #3
predamarcel
IS-IT--Management
if i'm not wrang...
for this type of switches, exist the command:
"show mac address-table"
probable in the cisco commands docs you can find more about that...
PM
for this type of switches, exist the command:
"show mac address-table"
probable in the cisco commands docs you can find more about that...
PM
jimbopalmer
Programmer
I use nortel, not cisco, so this will be general
I go to my layer 3 switch (router) and look in a table that relates ports to MACs to IPs, this ususally locates a layer 2 switch on a port
In the layer 2 switch I can relate ports to MACs using the MAC I found in the layer 3 switch. If we found another layer 2 switch, we repeat.
I tried to remain child-like, all I acheived was childish.
I go to my layer 3 switch (router) and look in a table that relates ports to MACs to IPs, this ususally locates a layer 2 switch on a port
In the layer 2 switch I can relate ports to MACs using the MAC I found in the layer 3 switch. If we found another layer 2 switch, we repeat.
I tried to remain child-like, all I acheived was childish.
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1
- #6
raztaboule
IS-IT--Management
hi ,
sorry for my poor english.
i solved the same problem writing a script with perl and the perl SNMP module . it scans each hours my switchs and store the result in a file . the association mac / port can be found in the bridge MIB. ( i don't have the OID here cause i'm not at work , mail me if you are interested )
sorry for my poor english.
i solved the same problem writing a script with perl and the perl SNMP module . it scans each hours my switchs and store the result in a file . the association mac / port can be found in the bridge MIB. ( i don't have the OID here cause i'm not at work , mail me if you are interested )
raztaboule
IS-IT--Management
yes but it is not really meaning full cause there is no comments, it's include in a package who do other things, you will need to have a description of config files i use for my administration.....and i'm a poor perl programmer...
I use the perl module Net::SNMP
the OID i check are 1.3.6.1.2.1.17.1.2.0 for the number of port , 1.3.6.1.2.1.17.4.3.1.2 for the mac adresse in decimal , 1.3.6.1.2.1.17.4.3.1.1.<the value of the mac in decimal> to retreive the mac in hexa , and i just retreive the mac addresse if 1.3.6.1.2.1.17.4.3.1.3.<the value of the mac in decimal> != 4 ( but i don't remember why... )
I store the result in a hash table and compare it to the contents of my file and update the timstamp meaning "last time i ve seen this mac behind this port" .
Net::SNMP comes witch good examples.
If you have a perl problem it can be done in shell and with ucd-snmp utilities ( snmpwalk ).
Hope this will help.
write me here if you wish more information. raztaboule@yahoo.fr
I use the perl module Net::SNMP
the OID i check are 1.3.6.1.2.1.17.1.2.0 for the number of port , 1.3.6.1.2.1.17.4.3.1.2 for the mac adresse in decimal , 1.3.6.1.2.1.17.4.3.1.1.<the value of the mac in decimal> to retreive the mac in hexa , and i just retreive the mac addresse if 1.3.6.1.2.1.17.4.3.1.3.<the value of the mac in decimal> != 4 ( but i don't remember why... )
I store the result in a hash table and compare it to the contents of my file and update the timstamp meaning "last time i ve seen this mac behind this port" .
Net::SNMP comes witch good examples.
If you have a perl problem it can be done in shell and with ucd-snmp utilities ( snmpwalk ).
Hope this will help.
write me here if you wish more information. raztaboule@yahoo.fr
On a Cisco switch do a ping <ip address> and then do a show ARP. you'll see the port that the MAC connectes to.
Also you can use the command show CAM dynamic but you have to know the MAC address of the client in advance to relally go through the list of show cam dynamic output.
One more way is to have someone temporary disconnect the network cable from the NIC and you consoled into the swtich. You 'll see something like port 3/12 left the bridge.
regards,
Asghar
Also you can use the command show CAM dynamic but you have to know the MAC address of the client in advance to relally go through the list of show cam dynamic output.
One more way is to have someone temporary disconnect the network cable from the NIC and you consoled into the swtich. You 'll see something like port 3/12 left the bridge.
regards,
Asghar
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