RE: [mpls-linux-general] meaning of the mpls instructions

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I did a similar setup like yours last week, so my memory is still fresh.

I used the "mpls xc" command on an LSR to "cross-connect" an incoming =
label
with an outgoing label. For example, here is what I did on my LSR:

/* setup ilm to process incoming label "gen 100" via eth0, labelspace 0 =
*/
mpls labelspace add dev eth0 labelspace 0
mpls ilm add label gen 100 labelspace 0

/* setup an outgoing label "gen 101 (key 2)" via nexthop 192.168.1.3 */
Mpls nhlfe add key 0 (returned key value 2)
mpls nhlfe change key 2 instructions push gen 101 nexthop eth1 ipv4
192.168.1.3
ip route add 192.168.1.3/32 via 192.168.1.3 spec_hn 0x8847 2

/* "Corss-connect" the two labels together to form an LSP */
mpls xc add ilm_label gen 100 ilm_labelspace 0 nhlfe_key 2

My "192.168.1.3" will be your "192.168.4.4."

To form a bi-directional LSP, you will need to setup an LSP from your =
LER-B
to LER-A.

I am working on a PowerPoint file to show the details of setting up a
bi-directional LSP. I'll send it out when I am done, if there are =
interests.
(This is just my notes so that I won't forget what I did to make it work =
:-)

Cheers,
John Lin

> It's ok! I know what MPLS is and how it work. I understand the
> commands nhlfe, ilm, labelspace, but I don't understand command xc.
>=20
> I understand the commands individually but I don't know make a network
> with this software (with mpls command):
>=20
> 192.168.2.1----------LER A----------LSR------------LER B----------
> 192.168.4.4
>=20
> In http://mpls-linux.sourceforge.net/ there is an example where
> explain how configure ingress LER (LER A) and egress LER (LER B). And
> the LSR?
>=20
> Configuration LER A:
> #mpls nhlfe add key 0 instructions push gen 200 nexthop eth0 ipv4 LSR
> Key: 0x00000002
> #ip route add 192.168.4.4/32 via LSR spec_nh 0x8847 0x2
>=20
> Configuration LER B:
> #mpls labelspace add dev eth0 labelspace 0
> #mpls ilm add label gen 200 labelspace 0
>=20
> It is ok? I are not sure! because the label 200 will be changed in the
> LSR, will not? And how I configure the LSR?
>=20
> Can you help me?
>=20
> Ra=FAl Gil.
>=20
> On 6/16/05, James R. Leu <jl...@mi...> wrote:
> > Hi there,
> >
> > It seems you're new to MPLS.  If this is the can I suggest reading =
some
> > books of web-page that explain what MPLS is and how it work.
> >
> > Here are a few places to start, ofcourse a google search for MPLS =
will
> > result in a lot more information to read.
> >
> > http://mplsrc.com/
> > http://students.ee.sun.ac.za/~hvtonder/arc_mplsOverview.htm
> > =
http://www.ibr.cs.tu-bs.de/lehre/ws0405/ks/pdf-2x1/09-l3ip_e-mpls.pdf
> >
> >
> >
> > On Tue, Jun 14, 2005 at 12:44:27PM +0200, Ra?l Gil wrote:
> > > Hello! I am Ra?l Gil
> > >
> > > I have found in mailing list the mpls utility usage
> > >
> > > "mpls" utility usage
> > >  --------------------
> > >
> > >      mpls nhlfe add key 0 instructions push gen 16 nexthop wlan0 =
ipv4
> > > 192.168.2.1
> > >      (output: "Key: 0x2")
> > >      mpls ilm add label gen 16 labelspace 0
> > >      mpls labelspace add dev eth0 labelspace 0
> > >      mpls xc add ilm_label gen 16 ilm_labelspace 0 nhlfe_key 0x2
> > >      mpls tunnel add dev mpls0 key 0x2
> > >      ip route add 10.0.0.0/24 via 192.168.2.1 spec_nh 0x8847 0x2
> > >
> > > but I do not know that it makes each instruction (nhlfe, ilm,
> > > labelspace, xc), I do not know that it means.
> > >
> > > For example, if I execute 'mpls ilm add label gen 16 labelspace =
0',
> > > what I am doing?
> > >
> > > Can you helpme?, please!
> > >
> > > Ra?l Gil.
> > >
> > >
> > > -------------------------------------------------------
> > > This SF.Net email is sponsored by: NEC IT Guy Games.  How far can =
you
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> > > _______________________________________________
> > > mpls-linux-general mailing list
> > > mpl...@li...
> > > https://lists.sourceforge.net/lists/listinfo/mpls-linux-general
> >
> > --
> > James R. Leu
> > jl...@mi...
> >
> >
> >
>=20
>=20
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