ccna 2 pdf english

ccna 2 pdf english.For this example, the router Rl is statically configured using the frame-relay Imi-type ansi interface subcommand, while switch S1 is still using LMI type cisco. 34 LMI messages (with type cisco) have been exchanged on the router and switch when the LMI configuration is changed. After the modification is complete, the counter number for query messages sent by R1 continues to rise (122 captured when running the output of the show frame-relay Imi command), but the counter number for LMI status messages received from the switch remains at 34. Just below this counter is the timeout count, which counts the number of periodic LMI messages from the switch that the router would have expected to receive, but did not actually receive. At this point, the router is actually still receiving LMI messages, but because they are not ANSI LMI messages, the router cannot understand or recognize them.If the show frame-relay Imi command is used again and shows that the number of status messages received remains the same, the most likely cause, other than the fact that it is indeed a non-operational state link, is an LMI type mismatch. The best way to resolve this issue is to allow auto-awareness of LMI by configuring the noframe-relay Imi-type type type physical interface subcommand, or by configuring the same LMI type used by the switch.14.2 Basic Content 303On all routers connected by Frame Relay, all router access link physical interfaces should be in the up/up state if the problems identified in Steps I and 2 have been troubleshot and fixed. The last 4 steps are used to check for problems with individual PVCs and neighbors.4. PVC Problems and Status (Step 3) The purpose of this step in the troubleshooting process is to discover the DLCI of the PVC used to reach a specific neighbor and then find out if that PVC is working properly. To determine the correct PVC, especially if there is no or little configuration or documentation available, it is necessary to start with the failed ping commandStart by checking the IP address of the Frame Relay network neighbor router. From here, follow the logical chain below. Step 3a.Discover the IP address and subnet mask of each Frame Relay interface/subinterface (show interfaces, show ip interface brief) and calculate the correct connected subnet.b.From the failed ping command, compare the IP addresses of the neighbors and select the interface/subinterface whose connected subnet is the same subnet.c.Discover the PVC assigned to the interface or subinterface (showframe-relaypvc)d.If more than one PVC is assigned to the interface or subinterface, determine which PVC is used to reach o the particular neighbor (showframerelay