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cisco ccna jobs in europe.RouterB(config)# interface serial 0 RouterB(config-if)# encapsulation frame-relay ietf RouterB(config-if)# frame-relay Imi-type ansi RouterB( config-if)# ip address 192.168.2.2 255.255.255.0 RouterB(config-if)# frame-relay map ip 192.168.2.1 301 broadcastFirst, note that the two routers use different types of LMI. This is not relevant because LMI is only used between Frame Relay DTE and DCE. Second, notice that the DLCI numbers used are different on each end. As mentioned earlier, DLCI numbers are only meaningful locally and can vary across the segments that the VC traverses: the operator is responsible for assigning the DLCI number and providing the correct DLCI mapping.Video 25.05 A multimedia demonstration of configuring PVC manual resolution at a router is included in the companion digital resource to this book. Hands-on experienceA common problem when configuring manual resolution is that the administrator configures the wrong DLCI for the VC. For example, in the configuration shown in Figure 25.9, some administrators forget that the DLCI is only locally meaningful and configure DLCI 301 on Router A and DLCI 103 on Router B. To troubleshoot this problem, use the show frame-relay pvc or show frame-relay map to check the status of the VC to see if its status is deleted These show commands are discussed in the next section.Dynamic ParsingInstead of using PVC manual parsing, you can use dynamic parsing. Dynamic resolution uses the reverse ARP feature, which is similar to reverse ARP in TCP/IP. o Reverse ARP allows the device to automatically learn the Layer 3 protocol and address used by each VC.Reverse ARP is performed every 60 seconds on VCs that are not manually configured and only on VCs that are active. As mentioned in the previous section describing LMI, the state of the VC is learned from the full state update message. For example, after the physical layer of the interface is activated, the router will send an LMI query message every 10 seconds; after every 5 query messages, it sends a full state query message requesting the state of the VC from the switch to which the interface is connected. This means that it takes at least 1 minute for the router to learn the status of the VC.After the router learns that the VC is active, if it does not resolve it manually using the command frame.relay map, the router performs reverse ARP on the VC. to do so, it sends . frame containing the Layer 3 protocol and address it uses. When this frame arrives at the remote DTE, the remote DTE takes the protocol, layer 3 address, and local DLCI number from the frame header and adds them to the VC resolution table. Next, the remote DTE performs the same operation. In a very short time, the router knows the Layer 3 address at the remote end of each VC that it is dynamically informed of. Once the router knows the device on the other end of the VC, it can begin transmitting data to it.Exam Essentials Reverse ARP enables the router to send Frame Relay frames containing its Layer 3 addressing information through the VC. In this way, the target device isChapter 25 Frame Relay 697