[j-nsp] LDP/MPLS is mandatory in the route-reflector bgp vpnv4uplink?

[Nalkhande Tarique Abbas]

Ricardo,

I think that's expected simply because VPN-IPv4 Routes resolve in inet.3
(being MPLS based)

To support L3 VPNs, the Juniper Networks PE router uses several routing
tables. 

Inet.0 :
The first routing table, inet.0 contains routes learned by the
provider's IGP and by BGP. These routes include all destinations within
the service provider's own network, including the PE and P routers etc.

Inet.3 :
The second routing table, inet.3, contains all the routes that are
reachable via MPLS LSPs that are learned from either RSVP or LDP. This
table provides the connectivity for traffic sent between the PE routers
by the CE routers.

Bgp.l3vpn.0 :
The PE also maintains a routing table referred to as bgp.l3vpn.0. This
table stores Layer 3 VPN routes learned from other PE routers. Routes
learned from other PE routers are entered into this table when they are
received. "The PE router resolves the next hop for these routes by
executing a route lookup in the inet.3 table". This enables the PE
router to determine the path to the PE advertising the Layer 3 VPN
route. 

So unless you have a route/next-hop in inet.3 (LDP/RSVP), these routes
will not be installed & will remain hidden/discarded. 

Though not sure on cisco's interop part of your query.

Hope it helps!



 
Thanks & Regards,
Tarique A. Nalkhande


-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Ricardo
Tavares
Sent: Wednesday, December 02, 2009 9:15 PM
To: Juniper-Nsp
Subject: [j-nsp] LDP/MPLS is mandatory in the route-reflector bgp
vpnv4uplink?

Hi guys,

I did some tests using JunOS 9.4 acting as BGP reflector for vpnv4
address-family and found that when I disable LDP in the uplink to the
MPLS
core the routes sent by this reflector are discarded by the PEs (Cisco
or
Juniper) but the routes advertised by a Cisco router acting as vpnv4
reflector works fine without LDP.

 Is this a normal behavior? If yes someone can explain the process? If
yes
maybe there is a knob to control this?

Best Regards,

Ricardo Tavares
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