once again, many thx Priscilla - thats great.
-Original Message-
From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]]
Sent: 01 January 2003 21:05
To: [EMAIL PROTECTED]
Subject: RE: Ethernet Frame Types. [7:60071]
[EMAIL PROTECTED] wrote:
Hello again,
Is it possible to run any other encapsulation of Ethernet on a
Cisco
interface other than ARPA (Ethernet_II).
With IPX, it is possible to change the Ethernet frame type. IPX supports
four different frame types. Check this out:
Albany(config)#int e0
Albany(config-if)#ipx network 400 encapsulation ?
arpa Novell Ethernet_II
hdlc HDLC on serial links
novell-ether Novell Ethernet_802.3
sap IEEE 802.2 on Ethernet, FDDI, Token Ring
snap IEEE 802.2 SNAP on Ethernet, Token Ring, and FDDI
AppleTalk Ph. 2 doesn't use Ethernet II either, but it's not configurable.
It uses 802.3 with 802.2 and SNAP.
A few other protocols automatically don't use Ethernet II either, such as
CDP, BPDU, NetBEUI, and IS-IS.
Of course, if you're using VLANs, you can change the Ethernet encapsulation
to 802.1q or ISL, but the real Ethernet frame is still Ethernet II if
you're using IP.
If your concern is IP, then 99.99% of IP implementations use Ethernet
II. Cisco always defaults to that. If, however, a Cisco router sees a data
stream from a host where IP uses 802.3 with 802.2, the router can handle
this. In order to make it work, you need to use the obscure arp snap
command. So, although you can't configure IP to use anything other than
Ethernet II, you can configure ARP to use SNAP for that 0.001% of cases
where a host is doing IP on top of 802.3 with 802.2.
You might enjoy my Ethernet lab scenario here:
http://www.troubleshootingnetworks.com/ethernet.html
Priscilla
Many thx
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