MAC address for Serial Interface

Unanswered Question
Sep 27th, 2007

Does a mac address for serial interface exist? If so, how can i look for it in a router?

I believe Serial operates at the Layer 2.

I have this problem too.
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CSCO10892433 Fri, 09/28/2007 - 00:30

Hi, J_Vansen_S

Only 802.3 frame uses MAC address; and a serial port is typically encaped by hdlc, ppp or frame-relay. All these types of frames don't use MAC address. So, you won't see the MAC address on a serial port.



GillieLucent Fri, 09/28/2007 - 11:17


Only LAN interfaces like ethernet, FDDI interfaces uses MAC address.

Serial interfaces don't use MAC address, since its directly connected to the peer.

In HDLC-like serial interfaces, the Address field is a single octet, which contains the binary sequence 11111111.

For more information,

read RFC 1661- The Point-to-Point Protocol




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