
212 Chapter 7: Security of MPLS Layer 2 VPNs
service integrity. In addition, customers need to ensure the security of their own networks,
be they L2 implementations or L3-oriented designs. In this section, we introduce generic
Layer 2 security issues with a focus on Ethernet, which links Layer 2 with emerging
architectures such as Virtual Private LAN Service (VPLS) and Virtual Private Wire Service
(VPWS), which will be discussed in the next sections of this chapter.
NOTE The main security issue behind Layer 2 security is that on a shared Layer 2 medium, for
example an Ethernet switch, there is often no control over which side the packets are ...