The MPLS-OPS Archive

[Robert Lapointe <Lapointe@oyat.com>]

Hi Faisal !

IP v6 flow label functionalities are applied by first opening the IP
packet. It is experimental and includes many equivalent functions as
IPv4 such as Fragment Offset, Identifier, flags and many other
functions.

MPLS label serves a logical number to be associate with a Forward
Equivalence Class "FEC" i.e. a class where all packets to a destination
are to be treated in the same way.  The label is binded to a FEC over a
link between Label Switch Routers.  The coupling of links & associated
label bindings over each link defines a LSP i.e. Label Switched path
which is basically an and to end connection oriented virtual circuit
operating at a layer 2¼ !  Once an IP packet is opened up and classified
at the ingress of the MPLS network then this packet does not requires
any further opening up in intermediary LSRs.  The packet is therefore
switched at what can be called a layer 2¼ !.  The real layer 2 may
change over the different links but what is switched is the labelled
packet.

I don't think its a good idea to try to find similarities between IPv6
Flow Label and an MPLS Label.  It's like trying to find similarities
between eating a meal and washing dishes !

Hope this helps ! 

Faisal Naik wrote:
> 
> Hello friends, I need to ask a thing about MPLS.
> 
> Can anyone tell me the differnce or similarity between flow label field of
> Ipv6 header and label field of MPLS header?
> 
> Also incase of an IPv6 network what role do each of these fields play?
> 
> I hope i have made my question clear.
> 
> Best Regards,
> Faisal Naik
> 
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Robert Lapointe
Oyat Inc
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