brian dell wrote:
> 
> ARPA is the default encapsulation for an ethernet interface ?

ARPA's real name is Ethernet II. It's used for IP packets.

> 
> what are the other encapsulations ?

Novell-ether is the default Cisco encapsulation for Novell IPX packets, even
though Novell doesn't use it any more. It's also known as Novell Raw because
it has only an 802.3 header, with no 802.2 header.

Other possibilities are:

Cisco uses "sap" to refer to an 802.3 with 802.2 header. This is used for
many modern and IEEE-influence protocols, including Spanning Tree Protocol,
etc.

Cisco uses "snap" to refer to an 802.3 with 802.2 and SNAP header. AppleTalk
uses this. Many other protocols do also, including Cisco Discovery Protocol
(CDP), VLAN Trunking Protocol, Dynamic Inter-Switch Link Protocol.

This is a complex subject. 

Here are a couple links to help you:

http://www.cisco.com/warp/public/105/encheat.html

http://www.troubleshootingnetworks.com/ethernet.html

Priscilla







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