A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Private VLANs: Addressing VLAN scalability and security
issues in a multi-client environment
Author(s) : S. HomChaudhuri, M. Foschiano
Filename : draft-sanjib-private-vlan-03.txt
Pages : 0
Date : 2005-4-29
This document describes the concept of layer 2 isolation among devices
that are members of the same layer 2 domain.
A vlan is a layer 2 broadcast domain in which all devices can
establish direct communication with one another at layer 2.
As a consequence, devices that are connected to the same vlan
have an implicit trust relationship with each other. If 'untrusted'
devices are introduced into a vlan, security issues may arise
because trusted and untrusted devices end up sharing the same
broadcast domain.
The traditional solution to this kind of problem is to assign a
separate vlan to each device that is concerned about layer 2 security
issues. That however is not a scalable solution. The mechanism
proposed in this document can offer total layer 2 isolation
between devices connected to the same vlan. What that means is that,
on the one hand, each customer will enjoy the benefits that come
with a separate dedicated vlan, while on the other hand the service
provider will enjoy the benefit of consuming as few as two vlan
identifiers.
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