Traffic filtering has traditionally been used on routers and firewalls to enforce access control policies. Most traffic filtering is performed at Layer 3 and Layer 4; hence, traffic filtering on switches (traditionally being Layer 2 devices) is a relatively new practice. With the importance of security and quality of service, switches need extra intelligence to provide the features that enable end-to-end security and quality of service.
Support for these features varies by platform. For up to date feature support information, use the Feature Navigator at www.cisco.com/go/fn (CCO registration required).
Table 8-5 details the available traffic filtering features.