Re: [mpls-linux-general] LSP binding, nesting automatically

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

On Fri, Apr 18, 2003 at 10:56:20PM +0800, Sun Jianwei (Dr) wrote:
> thanks, James. so you mean lsp nesting can be generated dynamically by co=
mbining RSVP-TE and LDP? then is there such implementation in linux communi=
ty? i wonder how can a ldp session know the existence of the tunnel.
>=20
> another question. when a LSP is estbalished by CR-LDP, the ingress router=
 actually can bind other FEC with the lsp if the route for the FEC cover th=
e explicit route for the LSP. is there a mechanism to dynamically bind all =
these FECs with the LSP?=20

The questions your asking are all related to how LSPs are presented to other
MPLS signaling protocols and routing protocols.

I just gave a 'class' on advanced aspects of MPLS which covered how this
works.

It all has to do with having enties in the ingress LSRs IP routing table
that correspond to the router-id of the egress LSR.  When this happens
indirect LDP recongnize that the desired result is to map labels into
the LSP assocaited with the router-id.

You can use IGP short-cuts or IBGP to map more FECs onto an LSP.

>=20
> for you to understand my question, I can tell you my motivation to presen=
t the question. I am working on GMPLS project, the concern is to provision =
G-LSP(light path) dynamically. we make use of "mpls for linux" for our sign=
alling part of our software suite. when we establish the G-LSP, we need to =
broadcast the information to the IP routers out of the GMPLS enabled area, =
so that traffic can be aggregated to the ingress node of G-LSP, and the FEC=
 for the agregated traffic can bind to the G-LSP. what we are trying to do =
is to develop a mechanism to broadcast the G-LSP information to the network=
 and make use of the G-LSP as a tunnel for IP/LSP encapsulated traffic. =20
>=20
> best regards.
>=20
> -----Original Message-----
> From: James R. Leu [mailto:jl...@mi...]
> Sent: 2003t4=0819=E5 0:05
> To: Sun Jianwei (Dr)
> Cc: mpl...@li...
> Subject: Re: [mpls-linux-general] LSP binding, nesting automatically
>=20
>=20
> This a fairly vague question. Each protocol/MPLS service has it own
> mechanisms for doing them.  Pick one particular one and I can explain it
> to you.
>=20
> Here is an example to refer to:
>=20
> Layer 2 cross connects across an LDP created LSP that utilizes a RSVP
> traffic engineered core.
>=20
> In this case you will have:
>=20
> RSVP-TE creates 'tunnels' (think of a big pipe) that control how large
> amounts of traffic move from P to P router.  LDP then runs in direct mode
> from the PE to the P routers, and indirect mode across the RSVP-TE 'tunne=
ls'
> (from P to P routers).  The resulting LDP LSPs run from PE to PE but are
> tunneled inside of the 'big pipe' to cross the core.  Ontop of the LDP LS=
Ps
> another indirect LDP session is created to exchange labels for the layer 2
> cross connect. (think of these as 'application labels')
>=20
> Which part of this (or another example) do you want me to explain?
>=20
> On Fri, Apr 18, 2003 at 09:41:55PM +0800, Sun Jianwei (Dr) wrote:
> > hello all,=20
> >     when a lsp is established, how can it broadcast to network, so that=
 the lsp can bind with other FECs or  nest other lsps?  I think one aproach=
 is to register the lsp as a virtual network interface, unnumbered link, th=
en it can be broadcasted through routing protocols. is there any implementa=
tion of such mechanism?=20
> >=20
> >     mplsadm provides tunnelling(or lsp nesting) mechanism, but it is ma=
nually configured. how to make it to be dynamically? is there any related I=
ETF RFC or draft?
> >=20
> > thanks.
> > Jianwei  =20
> >=20
> >=20
> >=20
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>=20
> --=20
> James R. Leu
>=20
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--=20
James R. Leu