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Title : Hierarchy of Provider Edge Device in BGP/MPLS VPN
Author(s) : L. Bin, D. Weisi et al.
Filename : draft-libin-hierarchy-pe-bgp-mpls-vpn-02.txt
Pages : 13
Date : 2003-5-27
In the deployment of BGP/MPLS VPN,the PE(Provider Edge)Device should
maintain all the VPN routes of the VPNs which it belong to.When there
are many VPNs converged by a PE,and the capacity of PE is relevant
limited,then the bottleneck will be encountered.Another problem is
that the current BGP/MPLS VPN model is something of a 'Plane Modle'
where the demand of the performance of the PE device are all the
same no matter which layer the PE device is belongs to.However,the
typical network is 'Core-Convergence-Access(Edge)' model,and the
performance of the device is superior in Core Layer and inferior in
Access Layer,and the scale of network is large in Access Layer and
small in Core Layer,the routes are converged in every layer,so in
current 'Plane Modle',when PE device push to the edge layer,it has
to maintain more VPN routes,this makes it difficult to extend the PE
device to edge layer.This document defines an model of Hierarchy of
Provider Edge Device in BGP/MPLS VPN,where Hierarchy of Provider
Edge Device can be composed of several device and every device take
on the different part,partake the function of the former
concentrative PE,we call this model 'Hierarchy Model',In this model
the demand of performance in Routing and Switching is strict to the
PE device in High layer,loose to the PE device in edge layer.
One HoPE can be composed of a SPE and UPES connected to the SPE,
or be composed of a high-level SPE and HoPEs connected the high
level SPE and and build up a new HoPE.This build is called nesting
of HoPE,and this kind of nesting can be done for many times.Thus the
former HoPE connect to the high-level SPE as a role of UPE,and the
new HoPE can connect a single UPE too.
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