In order to make MPLS VPNs really work, there are neat little things you can
do.... First, you (may) run a routing protocol with your clients on the
edge routers. You set up VRFs (virtual routing/forwarding instance) in
order to separate the routing tables into a per-VPN setup. That way you
can have multiple clients that technically have overlapping IP ranges. (in
this instance, "normal" IP routing would fail miserably)
Between your edge routers, internally, you will run MBGP (multiprotocol bgp)
and use some extended community attributes to push each VRF routing table
separate from the rest. So ALL of your routers have the entire BGP
community/subcommunity routing table, and know how to get any packets to the
appropriate other members of the same VPN.
Looking through the technology pages on Cisco's TAC site, there are
informative documents on this type of configuration. Otherwise, I would
suggest talking to the Cisco SEs (or NSA folks, whoever your reps are),
because they can give you better access to any internal documentation that
will help spell everything out. They have samples, powerpoint presentations
and everything to assist you!
Scott
-----Original Message-----
From: Vinod Anthony Joseph Cherunni [mailto:vac@dsqworld.com]
Sent: Wednesday, October 04, 2000 1:46 AM
To: cisco-nsp@puck.nether.net
Subject: [nsp] REG: MPLS based VPN's
Hi All,
We are in the process of provisioning MPLS on an packet only (IP) based
infrastructure, primarily to cater to corporate VPN requirements. My
questions are as follows -
1. By provisioning an MPLS based VPN can I commit bandwidth guarantees to
my VPN customers (something like Frame Relay CIR).
2. I have read that MPLS VPN's seperate the Internet routing tables from
customer routing information. When a VPN is provisioned for a customer, how
does the routing actually happen? The customer would prefer to run his own
routing protocol between his sites, & how does a service provider provision
this.
3. I have come across an offering from AT&T, called Frame over IP, wherein
customers connect using Frame Relay & eventually get hooked on to an IP
(MPLS) cloud, which is the core of the AT&T network. Any comments on this.
Kindly advice,
With warmest regards,
Vinod.
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