The MPLS-OPS Archive

[Manish Gajria <manish@ipinfusion.com>]

I agree with Roger, It depends on what you are trying to do
with MPLS.

Firstly i think the MPLS lab should begin with a simple Label
distribution mechanism like LDP or RSVP-TE
to understand label pushing , swapping and poping.
VPNs could be the next step.

So with 4 routers you could  have a very precise label switching network
with one end to end LSP and all functionality can be observed / studied etc.

Just enable LDP with default configurations on all routers on the given interfaces
and go through the label tables,  and if possible capture the packets and study the label
operations on each segment of the network ( ethereal is a good tool to use ).

Hope this helps
Manish  Gajria
 
 
 

Roger Clark Williams wrote:

  Federico, with all respect I would still say an MPLS network can be set
up without a P router, using only 2 PE routers back to back.  Granted, you
will not get a good look at all the proper LDP labeling because each PE is
the ultimate, not penultimate router. However, from a VPN point of view,
all BGP sessions work, VPN labels are exchanged etc, IGP routing happens, etc

I guess it depends on what you are trying to do, trying to see.

Roger Williams

.
>Resent-Date: Fri, 25 Oct 2002 04:34:21 -0400
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>From: Aita Federico /Consulente <Federico.Aita@albacom.it>
>To: "'mpls-ops@mplsrc.com'" <mpls-ops@mplsrc.com>
>Subject: R: [MPLS-OPS]: Minimum Network Configuration to setup MPLS
>Date: Fri, 25 Oct 2002 10:13:45 +0200
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>You have a problem:
>
>to implement the MPLS, you need at least a 3 router core:
>2 PE-router
>1 P-router
>
>+2 CE-router
>
>MPLS PE takes the incoming packet and push the label,
>than, the last P does a "penultimate hop popping" by removing
>the label and pass it to a PE-router as an IP packet.
>
>So with 2 PEs only you don't have an MPLS core...
>
>Cisco implement MPLS from 2600's family to 12000...
>
>Bye
>
>Federico Aita
>Network Specialist Dati
>Cisco Certified Network & Design Associate
>Albacom
>
>
>-----Messaggio originale-----
>Da: champion boliao [mailto:mpls2000@mail.com]
>Inviato: venerdì 25 ottobre 2002 3.55
>A: mpls-ops@mplsrc.com
>Oggetto: [MPLS-OPS]: Minimum Network Configuration to setup MPLS
>
>
>Hi,
>
>I am struggling to understand more about MPLS network. I am currently trying
>to setup a MPLS network in my lab.
>
>I have 4 routers, 2 Cisco 3600 series and 2 Cisco 7200 series. Am I able to
>setup a MPLS system with these element by the following configuration ?
>
>
>    CE---PE---PE---CE
>
>Which routers should be treated as CE and which as PE?
>Is this the minimum routers needed to setup a MPLS network?
>
>Please give me your advice to enlighten me.
>
>Thank you very much.
>--
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-- 
--------------------
Manish Gajria

ip infusion
408-794-1539
manish@ipinfusion.com
---------------------