The access module deals mainly with Ethernet switch technology. As long as the intricacy of the STP protocol is well understood, it is possible to build a robust Layer 2 network in this module. Keeping the Layer 2 design simple and predictable is perhaps the best insurance for building a resilient IP network within the access module. The same principle applies to the Layer 3 domain. By adopting the best practices, you can improve the resiliency of the network and avoid unnecessary downtime.