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The Cisco network caching solution is designed and optimized to work as a single caching system, in which are combined the following features: Cache-aware internetworking equipment Cisco routers are capable today of allowing the network to optimize traffic flows based on type of content flowing through them This is done by the Web Cache Communication Protocol (WCCP), a router/cache protocol that localizes network traffic and provides "network-intelligent" load distribution among single or multiple network caches for maximized download performances and content availability Network-integrated Cisco Cache Engines Cisco Cache Engines provide network management capabilities already available on Cisco networking gear, resulting in minimized management and operational costs In addition, these engines are specifically designed as a caching network hardware solution Therefore, they are generally a lot faster than other caching solutions Cisco Cache Engines are transparent to end users The end users do not have to change what gateway their computer systems point to This means if the Cisco Cache Engine fails, the network knows this and sends the user's request directly out the Internet; the end users don't even know the Cisco Cache Engine failed The Cisco Cache Engine solution has several benefits Some are highlighted here: Transparent network caching Hierarchical deployment Scalable clustering Fault tolerance/fail safety WCCP multihome router support Overload bypass Dynamic client bypass
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How Do Cisco Cache Engines Work
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In order to localize Internet bound traffic, your network needs to now how to qualify certain traffic and send it out based on specified parameters This capacity can be achieved by enabling content routing technology Cisco IOS software's Web Cache Communication Protocol (WWCP) can be enabled on your network's routers to provide this content routing technology Then, the next step after configuration of WCCP is the placement of the Cisco Cache Engine(s) at strategic points within your existing network These two steps complete the traffic localization solution The network caches will now transparently cache (or store frequently accessed content) and then locally fulfill successive requests for the same content This will reduce repetitive transmission of identical content over WAN links Figure 13-14 shows how the two components work together to keep Web requests local when possible
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Figure 13-14: Relationship between user request for a Web page and the Cisco Web Cache Engines
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The two most common types of caches on the market today are proxy servers and stand- alone caches Proxy servers are software applications that run on servers and standard operating systems The proxy server acts as a "gatekeeper" It receives all packets destined for the Internet and examines each packet to determine if it can fulfill the requests itself The downside to proxy servers is they are not a dedicated solution to provide Web caching, and so they fail under heavy network loads In addition, since all clients need to be configured to point their workstations at the proxy server, the failure of the proxy server causes all users to lose network access You would have to go to each workstation and change the gateway a very tedious and time-consuming proposition Stand-alone cache systems are applications/appliances designed to improve performance by enhancing the caching software Unfortunately, typical stand-alone cache systems are not network integrated, which means they have high ownership costs and are less desirable for wide-scale deployment
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The Cisco Cache Engine is categorized in the 500 series, with each model designed for a different network environment: Cisco Engine 505 This is an entry-level cache engine for enterprise branch offices with WAN uplink bandwidth up to T1 rates Cisco Engine 550 This is a mid-range cache engine for Internet Service Providers (ISP) and enterprise sites with WAN uplink bandwidth up to 11 Mbps
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Cisco Engine 550-DS3 This is the clustered Cache Engine 550 solution for ISPs and enterprise sites with WAN uplink bandwidth up to DS3 rates (45 Mbps)
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