Any router in active state for a route must wait for a Reply to each of its Query messages. It is possible for a router to wait several minutes for all the replies, because neighboring routers might also need to go active, and then their neighbors might need to go active, and so on—each withholding its Reply message until it in turn receives all of its Reply messages. In normal operation, the process should complete; to handle exception cases, EIGRP includes a timer called ..
When the boot field is not a hex 0 or 1, routers choose the OS through the use of the boot system configuration command. If the configuration register calls for a full-featured IOS (boot field 0x2-F), the router reads the startup-configuration file for boot system commands. If present, the router tries each boot system command, in succession, until it finds an IOS to load. If there are no boot system commands, the router takes the default action, which is to load the first fi..
The core is the first place in your network where scaling issues will become apparent. This is because the core tends to combine the largest number of routes with the largest amount of traffic, taxing the routers to their limit. Using BGP in the core allows the routes in the core to separated into two parts: routes within the core and routes external to the core. The iBGP mesh carries the routes external to the core, while the IGP continues to carry just the routes within th..
Monitoring and Troubleshooting CBWFQ for Frame Relay
The show policy-map privileged EXEC command can be used to display the configurations of all classes comprising the specified service policy map or all classes for all existing policy maps. A sample output of the show policy-map command is shown in Example 18-4. Example 18-4. Output of show policy-map Command at R1 R1#show policy-map Policy Map CBWFQ Class premium Weighted Fair Queueing &n..
First, we will show an example of redistributing from OSPF into RIPv6: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#ipv6 router rip RIP_PROC Router1(config-rtr)#redistribute ospf 1 metric 5 Router1(config-rtr)#exit Router1(config)#end Router1# And here is an example showing redistribution of RIPv6 into OSPF: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. ..
