cisco ccna lab kit

cisco ccna lab kit.Chapter 25 Frame Relay 713but the measurement time is shorter than CIR. Frames that exceed Be are marked as discardable, and in the event of congestion on the operator's network, the operator will first discardthese frames. BE is the maximum allowable rate for VCs, and any data after that rate will be discarded. Oversubscription means that the CIR of all VCsThe sum of all VCs exceeds the access rate (the speed of the physical line), based on the assumption that all VCs will not operate at their CIRs at the same time. FECN and BECN are used to refer to congestion on the way out from the source DTE to the destination DTE.To specify the encapsulation type, use the command encapsulation frame-relayo Cisco routers automatically detect the LMI type; to explicitly specify the LMI type, use the command frame-relay lmi-typeo To display the number of LMI messages sent and received, use the command show interfaces or show frame-relay lmi-typeo. command show interfaces or show frame-relay lmioTo perform Layer 3 address-to-DLCI resolution in the configuration, two methods can be used: manual resolution and dynamic resolution. To specify the manually resolved VCs, use the command frame-relay mapo reverse ARP every 60 seconds, allowing you to dynamically learn the Layer 3 address of each VC. Reverse ARP is performed on a VC only when it is active, that is, when it is operating normally between two DTEsc If the VC is inactive, it is operating normally between the DTE and the DCE, but there is a problem between the local DCE and the remote DTE. If the VC is in the Deleted state, there is a problem between the local DTE and the local DCE. To view the VC resolution table, use the command show frame-relay map; to view the PVC, use the command show frame-relay pvcoNBMA networks that use a partial mesh topology can create horizontal segmentation problems for distance vector routing protocols. To solve this problem, you can use any of the following solutions: use a full mesh topology, use static routes, disable horizontal segmentation, or use subinterfaces, but subinterfaces are recommended. When configuring Frame Relay using subinterfaces, configure the encapsulation type and LMI type on the primary (physical) interface and the DLCI number of the Layer 3 address and VC on the subinterface (command frame-relay interface-dlci)25.6 Two-Minute SprintVirtual Circuits . Use the following formula to calculate the number of connections needed for a fully meshed network: (Nx(N-1)) /2O. VCs are not associated with a specific time slot for channelized connections and are much easier to add and modify than leased lines.