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MPLS over Ethernet formating

  • From: Bora Akyol <akyol@pluris.com>
  • Date: Tue, 17 Oct 2000 12:46:10 -0700
  • CC: "'Yaron Raz'" <yaronraz@hotmail.com>, "'mpls@UU.NET'" <mpls@UU.NET>

For RSVP-TE, the L3 PID is carried as part of signaling.

For LDP and CR-LDP, the protocol can signal a last hop label value of 0 or 2; or one can use configuration.
 

Eyad Saheb wrote:

 

From my understanding, the L3 protocol should/could be inferred from the last label (or by configuration in the router ex. always assume L3 to be IP).  For example, a label value of 0 represents IPv4, 2 represents IPv6, etc...

-----Original Message-----
From: owner-mpls@UU.NET [mailto:owner-mpls@UU.NET]On Behalf Of Yaron Raz
Sent: Tuesday, October 17, 2000 8:04 AM
To: mpls@UU.NET
Subject: MPLS over Ethernet formating

As I understand, when running MPLS on top of Ethernet, the ETH frame format
should be:
DA, SA, Ethertype (of MPLS), shim header, L3 data.
This means that the original Ethertype of a packet is lost.
How can the egress LSR perform the forwarding, if it doesn't have the L3
protocol of the packets?
Is there a standard way to transport the originalEthertype along the LSP?

Thanks,
Yaron
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