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-04.txt
Pages : 14
Date : 2005-12-29
This document describes the concept of Layer 2 isolation among
devices that are members of the same Layer 2 domain.
A vlan is a 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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