- This publication consists of the following six parts:. - More complex network environments mean that the potential for connectivity and performance problems in internetworks is high, and the source of problems is often elusive.The keys to maintaining a problem-free network environment, as well as maintaining the ability to isolate and fix a network fault quickly, are documentation, planning, and communication. - The enable exec command will place the router in the privileged exec mode. - However, attaching a network analyzer to the suspect network is less intrusive and is more likely to yield useful information without interrupting the operation of the router.The following are some typical third-party troubleshooting tools used for troubleshooting internetworks:. - Booting the Router. - (Use the show version exec command.). - Step 2 Check the seating of the RSP. - Step 9 Use the show running-config privileged exec command to see whether the router configuration contains the. - Step 6 Enter the reload privileged exec command to restart the router.. - Step 2 If no image exists, use the copy tftp flash privileged exec command to copy the system image from your TFTP 1 server to the router’s Flash memory.The following is an example of the use of the copy tftp flash command:. - Step 2 Check the order of the boot system commands. - Use the show version exec command to check the configuration register setting.. - Look for an entry in the table for the network or subnet of the server.. - Step 1 Check the permissions of the system image file.. - Step 1 Use the show running-config privileged exec command to view the router configuration. - ip-address—IP address of the router.. - If the router is sending packets over an invalid path, a message similar to one of the following is displayed on the console:. - Step 3 Use the show interfaces exec command on routers in the path or place a network analyzer between the router and server. - Step 2 Check the router configuration file. - Remember to use the router image filename in the boot system global. - Step 2 Check the terminal speed configured on the router as specified in the configuration register setting (default is 9600 baud, 8 databits, 2 stop bits, and no parity).. - Step 3 If the terminal speed of the monitor and the router do not match, modify as necessary.. - Use the show interfaces ethernet privileged exec command to display information about an Ethernet interface on the router:. - Excessive noise Step 1 Use the show interfaces ethernet exec command to determine the status of the router’s Ethernet interfaces. - Step 2 Check the diameter of the network and make sure it is within specification.. - MTU Maximum transmission unit of the interface.. - DLY Delay of the interface in microseconds.. - When the number of hours in any of the. - Nonfunctional FDDI ring Step 1 Use the show interfaces fddi exec command to determine the status of the router’s FDDI interfaces.. - neighbor State of the neighbor:. - The ECM state can be one of the following:. - The configuration management state can be one of the following:. - The — state can be one of the following:. - Step 1 Use the show interfaces token command to determine the status of the router’s Token Ring interfaces.. - Use the show running-config privileged exec command to determine which speed is specified on the router.. - Step 7 If the router still cannot connect to the ring, check internal cable connections of the router Token Ring cards. - Also shows the address of the interface.. - A sample entry, shown in Figure 7-7, is interpreted as meaning “to get to network 34.1.0.0 (subnet 1 on network 34), the next stop is the node at address . - Use the following UNIX command:. - where address is the IP address of the default gateway (the router local to the host). - Step 3 If routing information is not being exchanged (that is, if the output of the show ip route command shows no entries that were learned from a routing protocol), use the show running-config privileged exec command on the router.. - Split horizon is disabled Step 1 Use the show ip interface privileged exec command on the remote router to see the router configuration.. - Check the output of the show ip interface command for the following:. - Step 1 Use the show interfaces privileged exec command to see whether the interface is “administratively down”:. - Step 1 Use the show running-config privileged exec command to view the router configuration.. - Step 1 Use the show running-config command to check each router in the path.. - Check the output of the command to see whether packets are being received from the host.. - If the router does receive packets from the host, use the show. - running-config privileged exec command to check the configuration of the router interface that first receives the packet from the host.. - The following entry is shown in the configuration:. - Step 1 Use the show running-config command to check the configuration of each router in the path. - Step 1 Use the show running-config privileged exec command to view the configuration of each router in the major network.. - Step 2 Use the show ip interface privileged exec command. - Step 1 Use the show running-config privileged exec command on suspect routers. - C7010(config-router)#distribute-list 5 out igrp 71 C7010(config-router)#access-list 5 permit 15.0.0.0 Step 4 If the router is running multiple routing protocols, look for a redistribute. - The following is an example of the show ip ospf interface command:. - Use the. - Step 1 Check the router configuration using the show running-config privileged exec command.. - Use the network router configuration command.. - Step 1 Check the configuration of the routers at each end of the virtual link using the show running-config privileged exec command.. - Step 2 Use the show ip ospf exec command to find the router ID (IP address) of the routers.. - Step 2 If some connected routers are not shown in the output, use the show running-config privileged exec command to view the configuration of the suspect routers.. - Step 1 View the router configuration using the show running-config privileged exec command on each router in the autonomous system.. - Step 1 Use the show running-config privileged exec command on all routers in the network.. - Use the show interfaces exec command to display statistics for all interfaces configured on the router.. - Routers in the network are running HSRP.. - Step 2 Use the show ip bgp privileged exec command to view the addresses in the BGP routing table.. - Step 4 Check the output of the show interfaces command again. - Router interface is down Step 1 Use the show interfaces exec command on the router to check the status of the router interfaces. - Step 1 Use the show ipx interface privileged exec command to check the encapsulation type specified in the router configuration. - Step 1 Use the show interfaces token exec command on the router. - Step 1 Use the show running-config privileged exec command to examine the current configuration of each router in the path.. - Use the show running-config command to verify that the rest of the IPX configuration is still correct.. - Address mapping error Step 1 Use the show running-config privileged exec command to view the configuration of the router.. - Step 2 If you see packets other than type 20, use the show running-config privileged exec command to view the router configuration. - o0r misconfigured on the router. - It can be one of the following values:. - Step 1 Use the show ipx interfaces privileged exec command on the router to view the state of IPX interfaces. - Step 1 Use the debug ipx routing activity privileged exec command on the router. - Step 2 Use the show running-config privileged exec command to view the router configuration. - Step 1 Use the show ipx route privileged exec command to see the IPX routing table.. - Step 3 Use the show running-config privileged exec command to view the router configuration. - SAP timer mismatch Step 1 Use the show running-config privileged exec command to view the router configuration. - Use the show running-config privileged exec command to see whether there are SAP filters that use any of the configured access lists. - Step 1 Use the show interfaces privileged exec command to check for output drops.. - Step 2 If there are excessive drops, use the show ipx servers exec command on the router. - node—(Optional) Node number of the router. - Use the show running-config privileged exec command on suspect routers to view the router configuration. - Step 1 Use the show running-config privileged exec command on each router in the network. - Step 2 Use the show ipx eigrp neighbors privileged exec command to make sure all Enhanced IGRP neighbors are shown in the neighbor table.. - Step 2 Use the show ipx servers exec command on the router. - Every router on an AppleTalk network (that is, on a single cable segment) must agree on the configuration of the network. - Step 2 Use the show appletalk route privileged exec command to view the routing table. - Step 1 Use the show appletalk access-list exec command on routers in the path from source to destination.. - Step 1 Use the show interfaces exec command to check the traffic load. - If the command output contains a “mismatch message,” the router configuration disagrees with that of the listed neighbor.. - Step 2 If necessary, rewire the lines and check the output of the. - Step 4 Use the show running-config privileged exec command on all AppleTalk Enhanced IGRP routers in the network. - Older version of the Cisco IOS software. - Use the show running-config privileged exec command on network routers.
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