Re: [mpls-linux-general] Some Questions

[James R. L. <jl...@mi...>]

On Wed, Jan 23, 2002 at 06:49:54AM -0800, Cheng Zhengchao wrote:
> Hi,All,

mpls-linux is an MPLS forwarding plane implementation.  It contains
kernel code to support label switching of packets.  It also has a
utility to statically create LSPs (like the good old days of creating PVCs
through and ATM network, or statically routing a subnet through a network)

If you want a dynamic means to setup LSPs (which is what it seems you are
about) you need an MPLS signaling protocol like LDP, RSVP-TE, or CR-LDP.
The protocols take care of advertising labels. ldp-portable is an
implementation of RFC3036 (label ditribution protocol).

>   I met some questions in my reading codes.I will
> appreciate your help very much.
> 1.In the mpls_linux,How do the labels are distributed
> among the ldp peers?In other words,How does the
> mplsadm get to know the infor about FTN,ILM and NHLFE?
> What is the relation between mpls_linux and
> ldp_portable?Does mpls_linux need ldp_portable to
> distribut lables?
> 2.Can someone tell me the meanings of variables in the
> structure mpls_printf_info?Especially the "pos".

This structure is used to help in the handling of buffers used for
displaying the content of the virtual files in the /proc file system.
'pos' stands for 'position', the current printing position in the
virtual file.  Remember that the virtual file may be larger then the
buffer suplied to the *_print functions, so the *_print function will be
called multiple times, with a different offset each time.  '*_print' can't
translate offset into 'where it left off' so the function just starts over,
but the 'pos' and 'offset' are used to decide when to start filling
the buffer again.

>  Thanks a lot.
> 
> Best Regard 
> 
> Cheng
> 
> 
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-- 
James R. Leu