CH A P T E R 4
Financial Institutions have many business applications that have different requirements for priority when traffic congestion occurs. A strategic QoS deployment will allow for an enhanced customer experience. Some applications will greatly disrupt the performance of other well behaved applications when they are erroneously deployed. The ability of the Financial Institution to successfully plan, implement and manage Enterprise scale QoS deployments is important. Improperly configured routers and switches are as big a threat to performance as rogue applications. Network staff should prioritize traffic by exclusion, meaning that they classify and prioritize the known important applications explicitly (e.g., voice, video and POS, leaving remaining traffic to participate in the best effort queue.
Financial Institution and service providers are encouraged to adopt RFC 4594 provisioning recommendations with the aim of improving QoS consistency, compatibility, and interoperability. Since these are guidelines and not standards, modifications can be made to these recommendations as specific needs or constraints require. A summary of Cisco's implementation of RFC 4594 is presented in Table 4-1.
Cisco Differentiated Services (DiffServ) QoS Recommendations for Medianets
Application Class VoIP Telephony Broadcast Video Real-Time Interactive Multimedia Conferencing Multimedia Streaming Network Control Call Signaling Ops/Admin/Mgmt (OAM) Transactional Data Bulk Data Best Effort Scavenger
Queuing and Dropping Priority Queue (PQ) (Optional) PQ (Optional) PQ BW Queue + DSCP WRED BW Queue + DSCP WRED BW Queue BW Queue BW Queue BW Queue + DSCP WRED BW Queue + DSCP WRED Default Queue + RED Min BW Queue
EF CS5 CS4 AF4 AF3
CS6 CS3 CS2 AF2 AF1 DF CS1
Required Required Required Required Recommended
Cisco Virtual Expert Management for Financial Services Design and Implementation Guide