Re: [mpls-linux-general] multiple FTN-NHLFE associations

[Stefano A. <sta...@un...>]

We hope to be able to split a single flow over multiple LSPs, both for load
balancing and security reasons. We are thinking of an iptables rule on the
ingress LSR which classifies the packets belonging to the same flow and targets
the appropriate entry into the NHLFE table. Such entry can contain an MFWD
instruction, which should be of the form: mfwd:mf:se:key1:key2:...:keyN where
mf is the multicast flag and se is a sort of "splitting engine". The
specification of a splitting engine (via a short name or an id) allows for
different splitting approaches. The splitting engine should be a function of
the sequence number of the packet and return the id of the selected LSP. The
sequence number may be put into the nfmark field by a proper iptables target (I
think there does not exist a target that marks the nfmark field with the value
of the packet counter) and read by the mpls code. The splitting engine may be
as simple as a round robin scheduler or as complex as to account for network
resource utilization.

In the case of splitting of a whole FEC (instead of a single flow) such approach
may be used as well.

Any comments?

Best regards,
Stefano


Scrive "James R. Leu" <jl...@mi...>:

> On Mon, Sep 27, 2004 at 05:48:28PM +0200, Stefano Avallone wrote:
> > Hi James and all,
> > 
> > we agree with your view, we were thinking of an instruction for the NHLFE
> table.
> > 
> > May we have more information about the current work? Maybe we can contact
> the
> > authors to exchange views/contribute to the work,...
> 
> Christophe Fillot <cf...@ut...> is working on the code and has written
> some operational code in kind of a 'proof of concept' form.  He and I
> discussed what the possible next steps are.  Maybe your input could help
> influence this process.  What are you looking for, and what do you hope
> to do with this feature?
> 
> 
> > TIA,
> > Stefano
> > 
> > Scrive "James R. Leu" <jl...@mi...>:
> > 
> > > I spoke too soon, someone is working on it.  I will make sure to
> > > post to the list when I have patches for it.
> > > 
> > > On Fri, Sep 24, 2004 at 06:16:56PM +0200, Stefano Avallone wrote:
> > > > Hi all,
> > > > 
> > > > we are interested in multiple FTN-NHLFE associations. Our goal is to
> split 
> > > 
> > > > a single flow (identified by means of source and dest address and port,
>  
> > > > protocol) over different LSPs. According to RFC 3031, the FTN may map a
>  
> > > > particular label to a set of NHLFEs, but exactly one element of the set
>  
> > > > must be chosen before the packet is forwarded. Does mpls-linux already 
> 
> > > > contain some code about such functionality? If not, any hint on how to 
> 
> > > > proceed?
> > > > 
> > > > Thanks a lot in advance,
> > > > Stefano
> > > > 
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> > > James R. Leu
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> > > 
> > 
> > 
> > 
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> 




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