3750G switch and video system

[william.s.childress.mil1]

On Cisco 3750G switches I can see the mac address on the ports with the mac address-table command except for video conferencing systems. I though this was due to the video system going to sleep but even when a call is made still no MAC is logged.

Anyone know why a video system MAC is not detected by the switch?

[acampbell]

William,

Just a thought, but is the link to the video system layer3

i.e.

int g1/0/x

no switchport

ip add etc etc

Regards

Alex

[william.s.childress.mil1]

No this is layer 2;

switchport mode access

[Zach S]

William,

From the switch, if you ping the device do you get an address in the ARP table?

As in:
ping <ip of device>
show arp

[william.s.childress.mil1]

I can ping the camera from the switch, then if I run "show arp" there is no entry for the camera's mac or IP address.

[Zach S]

Odd, have you modified any parameters for mac-address learning, like setting mac-address-table aging-time <value>?

Second note, is the switch acting as a Layer 3 device or Layer 2?
 

[william.s.childress.mil1]

There has been no modifications to the mac address learning. This switch is acting as a layer 2 device.

I have also now found that the same issue..happens with an HP digital sender as well.

[Zach S]

Hrm,

At the very least those addresses should show up in the directly connected switch whenever it receives a frame from that device. It might be an IOS bug of some type, have you googled your IOS version to see if has any noted bugs?

When you go to that device's layer 3 gateway, and run through the ARP command, does the MAC address show up in that devices ARP table?