CSCO10892433 Fri, 09/28/2007 - 00:30
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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.


HTH

SSLIN

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

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

Thanks,

Vijaybabu

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