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How to determine which interface is used for site to site connection

Hi

site A (CATALYST4006)and Site B(CISCO3750) are connected via 100Megs Lan EXTENSION.How do we determine which interfaces/ports on these switches are actually used for this site to site connection?I did "sh cdp neigh'did not help and I do not have physical access to switches.

Thanks

  • LAN Switching and Routing
2 REPLIES
Hall of Fame Super Silver

Re: How to determine which interface is used for site to site co

Hello,

look for the MAC address associated in the ARP table with the ip address of an host in site B from a site A host/gateway and then look for that MAC address in the site A switch cam table with

sh mac-address-table address

the outgoing interface that appears in the rightmost column is the interface from site A to site B

Hope to help

Giuseppe

Silver

Re: How to determine which interface is used for site to site co

Another idea in case the ARP entry for the other switch is not present is checking the system's MAC of the switch. Look in the show spanning-tree

Core3560#sh spanning-tree

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 32768

Address 000e.8389.8d00

Cost 19

Port 12 (FastEthernet0/10)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)

>>>>>>>> Address 0014.f246.e080

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300

-----------------------

Check the Bridge ID MAC address of Switch A and then look in the MAC table of Switch B for this MAC and you will find the port used to connect between each other

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