Tracing mac-address on 6509

[emmanuel.shoroma]

Hi all,

I am trying to trace a mac-address to find out what device it is and where is it connected. this is what I get

CENTSWCORE01# sh mac-address-table | include 001e.4a72.0d80

* 4 001e.4a72.0d80 dynamic Yes 0 Po305

* 3 001e.4a72.0d80 dynamic Yes 0 Po305

* 15 001e.4a72.0d80 dynamic Yes 5 Po305

* 12 001e.4a72.0d80 dynamic Yes 0 Po305

* 10 001e.4a72.0d80 dynamic Yes 5 Po305

* 11 001e.4a72.0d80 dynamic Yes 0 Po305

Does anyone knows what po305 is?

[Jon Marshall]

Po305 is an etherchannel connection. So in all likelihood your mac-address is on the device at the other end of the etherchannel.

"sh etherchannel summary" will show you which individual interfaces that form the etherchannel.

"sh cdp neighbor detail" will then show the devices on the other end of the interfaces.

You need to then log onto that device and run the mac-address-table command again.

Jon

[emmanuel.shoroma]

Thanks.

From the device on the otherside of the turnnel, I get the foolowing

CENTSWCORE02#sh mac-address-table address 001e.4a72.0d80

Legend: * - primary entry

age - seconds since last seen

n/a - not available

vlan mac address type learn age ports

------+----------------+--------+-----+----------+--------------------------

Active Supervisor:

* 4 001e.4a72.0d80 dynamic Yes 0 Po1

Another question. What is p01?

[emmanuel.shoroma]

P01 seems to be pointing me back to the otherside.

CENTSWCORE02#sh cdp neighbors p01

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID Local Intrfce Holdtme Capability Platform Port ID

CENTSWCORE01 Gig 2/48 176 R S I WS-C6506- Gig 2/48

CENTSWCORE01 Gig 5/2 171 R S I WS-C6506- Gig 5/2

[froggy3132000]

on the first CAT do

show interface po 305

on the other one do

show interface po 1

Its a cisco MAC so its mor than likely one of the interfaces.

[abdel.ibrahim]

Po means port-channel.you might have some ether-channel bundles on the 6509, which this interface is bind to(305). Do show etherchannel port-channel to see all bindings.

[Pontie66]

That PoXXX is for  interface Port-channel 

[chrihussey]

It is a Cisco MAC address spread across multiple VLANs. Generally, VLAN interfaces on a switch all use the same MAC address, so check that and verify.

You can also do "show ip arp | i  001e.4a72.0d80" to get the IPs associated with the MAC if L3 routing is occurring.

The fact that you're seeing the same MAC on both sides of the port-channel is a little concerning as it may indicate a loop of sorts, which would require deeper analysis.

[hassanshibu]

This could be the mac address of either any SVIs or virtual mac add of HSRP.