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while traversing the network, or if the device the request is sent to is not
responding for some reason, then a response to the request will never be
received by 3Com Network Director.
In order to determine when this situation has occurred, 3Com Network
Director uses the standard timeout technique: if a response is not
received to a request within a certain period of time (known as the
timeout period), 3Com Network Director concludes that there will not be
a response to that particular request.
If the route to a remote site passes over one or more WAN links that have
a very high latency then some, or even all, requests to that remote site
may time out. This would prevent 3Com Network Director from
monitoring and managing that site properly. By increasing the timeout
period you can increase the time that 3Com Network Director will wait
for a response to each request, preventing incorrect timeouts from
occurring and so allowing 3Com Network Director to monitor and
manage that site.
Configurable Retries
If a request sent by 3Com Network Director times out then this may be
due to either the request or the response being dropped while traversing
the network. As a result, 3Com Network Director cannot immediately
conclude that a device is not responding if it fails to respond to a request.
To cope with this situation 3Com Network Director uses the standard
technique of sending retries: if a timeout occurs for a request then 3Com
Network Director will try sending the request and waiting for a response
a second time. Depending upon the protocol, it may retry the request
multiple times before concluding that the device is not responding.
If the route to a remote site passes over one or more WAN links that are
oversubscribed then some, or even all, requests to or responses from that
remote site may be dropped by the routers at either end of the
oversubscribed links. By increasing the number of retries you can increase
the number of attempts 3Com Network Director will make with each
request before concluding that the device it is destined to is not
responding. This will increase the likelihood that requests sent to devices
at the remote site will succeed.
Summary of Contents for 3C15500 - Network Director - PC
Page 4: ......
Page 34: ......
Page 38: ...34 ABOUT THIS GUIDE ...
Page 50: ...46 CHAPTER 1 GETTING STARTED ...
Page 64: ...60 CHAPTER 2 PRODUCT ACTIVATION ...
Page 213: ...Components 209 Figure 75 Export to Visio Dialog Box ...
Page 220: ...216 CHAPTER 5 WORKING WITH THE MAP Figure 84 Double Clicking on a Router in the Tree ...
Page 264: ...260 CHAPTER 6 VIEWING DEVICE DETAILS Figure 117 Security Tab for a Device ...
Page 276: ...272 CHAPTER 6 VIEWING DEVICE DETAILS ...
Page 322: ...318 CHAPTER 7 MONITORING THE NETWORK ...
Page 385: ...Examples 381 Figure 189 Attach Alerts Dialog Box ...
Page 406: ...402 CHAPTER 9 PERFORMANCE REPORTING ...
Page 431: ...Components 427 History View dialog box Figure 210 History View Dialog Box ...
Page 440: ...436 CHAPTER 10 RMON Host View dialog box Figure 219 Host View Dialog Box ...
Page 476: ...472 CHAPTER 11 CREATING REPORTS ...
Page 502: ...498 CHAPTER 12 CONFIGURING SINGLE DEVICES ...
Page 526: ...522 CHAPTER 13 VLAN MANAGEMENT Figure 272 Options Dialog Box VLANs Tab ...
Page 567: ...Components 563 Figure 305 Selecting the Link to the End Station on the Map ...
Page 626: ...622 CHAPTER 14 BULK CONFIGURATION ...
Page 684: ...680 CHAPTER 16 UPGRADING DEVICE SOFTWARE ...
Page 814: ...810 CHAPTER 19 BACKING UP DEVICE CONFIGURATIONS ...
Page 838: ...834 CHAPTER 20 LIVE UPDATE ...
Page 894: ...890 APPENDIX G ADDING MAC ADDRESS VENDOR TRANSLATIONS ...