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-07.txt
Pages : 15
Date : 2007-5-25
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 user that is concerned about Layer 2 security
issues. That however is not always a scalable solution.
This document describes a mechanism to achieve Layer 2 isolation
among devices that are members of the same Layer 2 domain. What that
means is that, on the one hand, each user can enjoy the benefits
that come with a separate dedicated vlan, while on the other hand
the network provider will enjoy the benefit of consuming as few as
two vlan identifiers.
Moreover, the scheme described in this document allows end devices
to be Layer 2 isolated while sharing the same IP subnet, which in
turn allows the network designer to employ larger subnets and reduce
the address allocation and management overhead.
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