[j-nsp] Config help for basic MPLS setup

[Caillin Bathern]

Hi Matt,

 

You should only need iBGP between the PE routers, eg the SRX and the MX.
Just configure family inet-vpn unicast to pass the VRF/VPN routes.

 

Cheers,

Caillin

 

From: Matthew Crocker [mailto:matthew at corp.crocker.com] 
Sent: Tuesday, 25 September 2012 9:16 AM
To: Caillin Bathern
Cc: sthaug at nethelp.no; juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Config help for basic MPLS setup

 

 

The EX4200s will be P routes so I should be ok.  I'll get BGP running on
the SRX & EXs tomorrow.  The SRX & MX80 will be PE.

 

I'll update tomorrow if I can't get it working.

 

Thanks.

 

--
Matthew S. Crocker
President
Crocker Communications, Inc.
PO BOX 710
Greenfield, MA 01302-0710

E: matthew at crocker.com
P: (413) 746-2760
F: (413) 746-3704
W: http://www.crocker.com

 

 

 

On Sep 24, 2012, at 6:55 PM, "Caillin Bathern" <caillinb at commtelns.com>
wrote:





On point 2 there, the ex can only process one label at a time but there
could be a larger label stack than that so it can be a P router.

________________________________

From: sthaug at nethelp.no
Sent: 25/09/2012 8:25 AM
To: matthew at corp.crocker.com
Cc: juniper-nsp at puck.nether.net
Subject: Re: [j-nsp] Config help for basic MPLS setup

>  I have an MX80 and 3 EX4200s connected via 10GigE running MPLS, OSPF,
etc.  I have some ethernet-ccc links working between the gear.
> 
> I'm trying to setup my first MPLS based routing VRF (L3VPN ???)
between a new SRX210 and the MX80 (going through the EX4200s).
> 
> Eventually the configuration will look like this
> 
> <Internal LAN> -> SRX210 --[MPLS]--> EX4200 --[MPLS]--> EX4200 --
[MPLS] --> MX80 --[Internal LAN] --> Firewall
> 
> The SRX210 is a PE router owned and controlled by me.  I have a couple
other basic IP routes on it for other customers.
> 
> The idea here is that all traffic on ge-0/0/0.0 gets routed to the
MX80 through an LSP in the routing-instance corp.crocker.com
> 
> For testing the SRX is connected directly to the MX80 bypassing the
EX4200s
> 
> SRX has OSPF going with MX80 but does not have BGP configured.
> MX80 has BGP with my upstreams and other border routers
> 
> I'm sure I'm missing some MPLS filters or something but I'm not sure
what.

I see a couple of problems here:

1. MPLS L3VPNs use BGP to distribute the VPN label. Thus you *must*
have a full BGP mesh between your PEs (or you can of course use route
reflectors/confederations).

2. As far as I know the EX switches can only handle *one* MPLS label.
You need at least two labels for MPLS L3VPNs.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no
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