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Cisco's DistributedDirector is designed to address the issues of Internet service scalability by allowing you to Distribute network services transparently and cost-effectively across globally dispersed servers Maximize the ease and performance of access to distributed servers as seen by clients Reduce transmission costs associated with providing globally distributed network services Minimize time and cost associated with mirroring services Redirect client traffic away from offline servers
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How Does DistributedDirector Work
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DistributedDirector resides on a dedicated box that looks similar to the PIX 520 Firewall It is installed on the LAN and configured to share information with LAN and WAN routers, also referred to as Director Response Protocol (DRP) Server Agents LAN routers acting as DRP Server Agents share internal routing information, as illustrated in Figure 13-1; and WAN routers acting as DRP Server Agents share external routing information, as illustrated in Figure 13-2
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Figure 13-1: DistributedDirector and LAN DRP Server Agents
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Figure 13-2: DistributedDirector and WAN DRP Server Agents The information shared between DistributedDirector and its DRP Server Agents relates directly to the end user (client) and the target Web server Using the metrics provided by the DRP Server Agents, DistributedDirector determines the optimal server for the end user
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Director Response Protocol (DRP)
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Director Response Protocol is a simple User Datagram Protocol (UDP) used by the DistributedDirector system to gather metrics DistributedDirector sends two queries to the DRP Server Agents in the field, to acquire Border Gateway Protocol (BGP) and Interior Gateway Protocol (IGP) routing table metrics between the distributed servers and clients, to determine client-to-server distances This allows the DistributedDirector to redirect clients to the topologically closest server and to localize traffic Client-to-server link latency metrics using round-trip times DistributedDirector can thus compare link latencies and maximize end-to-end server access performance by sending the user to the server with the lowest trip time Figure 13-3 illustrates the traffic generated by the DRP
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Figure 13-3: DistributedDirector and WAN DRP Server Agents
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DistributedDirector Metrics
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DistributedDirector selects the best server not only during the end user's initial access, but also for each additional request during the session So, during a typical session, the end user's traffic may be redirected to one or several servers This section defines the various types of metrics that can be configured on the DistributedDirector (as summarized in Table 13-1) These metrics can all be collected, weighed, and/or ordered to define the "best" server for the client Table 13-1: DistributedDirector Metrics
Metric Supported
Source of Metric Data
Description
Uses DRP or Routing Table Information
DRP-External
BGP-AS (Autonomous Systems) hop counts IGP
Measures distance from DRP routers to client
DRP-Internal
Measures distance from DRP routers to nearest BGP border router toward client Measures distance from DRP routers to associated distributed servers Determines the distributed server with the lower BGP-MED value
DRP-Server
DRP-Multi-Exit Discriminator (MED)
BGP-MED value, AS, IP address of AS exit point for each DRP Server
Agent DRP-Round Trip Times (RTT) Portion RTTs Portion metric values Determines lowest RTT from server to client Assigns Portion metric values to each server; each server receives traffic corresponding to its Portion metric value Selects a random number for each distributed server; best server is the one with the smallest random number assignment Defines a server to have a statistical preference Yes No
Random
Random numbers
Administrative Cost
Statistical preference
DRP-External
The DRP-External metric defines the number of BGP autonomous system (AS) hops between the DRP server and the AS of the client requesting the Internet service The DRP server having the least number of AS hops between it and the client is selected as the best server and provides the Internet service to the client Figure 13-4 illustrates this metric
Figure 13-4: DRP-External metric determines best server based on AS hop counts
DRP-Internal
The DRP-Internal metric can be used along with the DRP-External metric to get a finer distance calculation between the DRP Server Agents and the client requesting the Internet service DRPInternal uses the IGP route metric between the BGP border routers and the internal LAN routers This metric helps determine the best server by discovering the hop count between BGP border routers and all internal LAN routers touched by the packets before they get to the DRP server The best server is determined without consideration to DRP-External metrics Figure 13-5 illustrates the DRP-Internal metric
Figure 13-5: DRP-Internal metric determines best server based on internal hop counts between BGP border routers and distributed servers
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