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- Configuring a Frame Relay Lab - Cisco - Spiceworks
- Serial 0 –> IE. Line going to R1
- Example: Frame Relay to Fast Ethernet TCC Configuration
- Serial 1 –> IE. Line going to R2
This is a picture of frame relay and it works a bit different. The idea behind frame relay is that you have a single infrastructure from the service provider and multiple customers are connected to it, effectively sharing everything. This icon is the frame relay switch. What else do you see? There are two customers 1 and 2 and each of them has a Headquarters Hub and a branch office Spoke. All of them are connected to the frame relay cloud. In the example above you can see two virtual circuits , the green and blue one. The physical connection is just the serial cable which is connected to the provider.
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Our logical links are virtual circuits. There is no virtual circuit between Spoke1 and Spoke2. Does this mean there is no connectivity between them? No you can still have connectivity between them by sending data to the Hub! If you like to keep on reading, Become a Member Now! Here is why:.
By default all DLCI numbers are assigned to the physical interface…. We use this on frame-relay multipoint interfaces where we can reach multiple routers through the same PVC. The DE bit indicates that the frame has a lower importance. When there is congestion, the frames with the DE-bit set can be dropped. Point-to-multipoint means you have the split-horizon problem but you can use a single IP subnet for all PVCs.
Use the frame-relay lmi-ndce interface configuration command to set the data communications equipment DCE and NNI error threshold. Use the no frame-relay lmi-ndce command to remove the current setting.
Configuring a Frame Relay Lab - Cisco - Spiceworks
In Cisco's implementation, N errors must occur within the number defined by the N event count in order for the link to be declared down. Therefore, the threshold value for this command must be less than the count value defined in the frame-relay lmi-ndce command. In the following example, the LMI failure threshold is set to 3. Use the no form of the command to remove the current setting. This command and the frame-relay lmi-ndce command define the condition that causes the link to be declared down. In Cisco's implementation, N errors must occur within the events count in order for the link to be declared down.
Therefore, the events value defined in this command must be greater than the threshold value defined in the frame-relay lmi-ndce command.
Serial 0 –> IE. Line going to R1
In the following example, the LMI monitored events count is set to 3. Use the frame-relay lmi-ndte interface configuration command to set the monitored event count on a DTE or NNI interface. Use the frame-relay lmi-tdce interface configuration command to set the polling verification timer on a DCE or NNI interface. Use the no form of the command to return to the default LMI type. The no form of the command is included to maintain backwards compatibility. Use the no form of the command to remove the DLCI number. To define the mapping between a destination protocol address and the DLCI used to connect to the destination address, use the frame-relay map interface configuration command.
Use the no form of this command to delete the map entry.
There can be many DLCIs known by a router or access server that can send data to many different places, but they are all multiplexed over one physical link. The optional ietf and cisco keywords allow flexibility in the configuration. If no keywords are specified in the configuration, the map inherits the attributes set with the encapsulation frame-relay command. You can also use the encapsulation options to specify that, for example, all interfaces use IETF encapsulation except one, which needs the original Cisco encapsulation method, and it can be defined using the cisco keyword with the frame-relay map command.
Payload compression is Cisco-proprietary and will not interoperate with routers of other manufacturers. You can disable payload compression by entering the no frame-relay map payload command and then entering the frame-relay map command again with one of the other encapsulation keywords: cisco or ietf. Use the frame-relay map command to enable or disable payload compression on multipoint interfaces. Use the frame-relay payload-compress packet-by-packet command to enable or disable payload compression on point-to-point interfaces.
The broadcast keyword provides two functions: It forwards broadcasts when multicasting is not enabled, and it simplifies the configuration of OSPF for nonbroadcast networks that will use Frame Relay. The broadcast keyword might also be required for some routing protocols--for example, AppleTalk--that depend on regular routing table updates, especially when the router at the remote end is waiting for a routing update packet to arrive before adding the route.
By requiring selection of a designated router, OSPF treats a nonbroadcast, multiaccess network such as Frame Relay in much the same way as it treats a broadcast network. In previous releases, this required manual assignment in the OSPF configuration using the neighbor interface router command. When the frame-relay map command is included in the configuration with the broadcast , and the ip ospf network command with the broadcast keyword is configured, there is no need to configure any neighbors manually.
Refer to the ip ospf network interface command for more detail. The following example maps the destination IP address To assign header-compression characteristic to an IP map that differs from the compression characteristics of the interface with which the IP map is associated, use the frame-relay map ip tcp header-compression interface configuration command.
Example: Frame Relay to Fast Ethernet TCC Configuration
To remove the IP map, use the no form of the command. IP maps inherit the compression characteristics of the associated interface unless this command is used to provide different characteristics. This command can also be used to configure an IP map that existed before TCP header compression was configured on the associated interface.
When IP maps at both ends of a connection inherit passive compression, the connection will never transfer compressed traffic because neither side will generate a packet with a compressed header. The command frame-relay map ip ip-address dlci tcp header-compression active can also entered as frame-relay map ip ip-address dlci active tcp header-compression.
The following example illustrates a command sequence configuring an IP map associated with interface serial 1 to enable active TCP header compression. Use the frame-relay multicast-dlci interface configuration command to define the DLCI to be used for multicasts. Use the no form of the command to remove the multicast group. Use this command when the multicast facility is not supported. Network transmissions packets sent to a multicast DLCI are delivered to all network servers defined as members of the multicast group. To enable the stack payload compression on a specified point-to-point interface or subinterface, use the frame-relay payload-compress packet-by-packet interface configuration command.
To disable payload compression on a specified point-to-point interface or subinterface, use the no form of this command.
Use the frame-relay payload-compress packet-by-packet command to enable or disable payload compression on a point-to-point interface or subinterface. Use the frame-relay map command to enable or disable payload compression on a multipoint interface or subinterface. A global priority list must be defined before this command is used.
Serial 1 –> IE. Line going to R2
In addition, the DLCIs mentioned in this command must be defined before this command is used. If you do not explicitly specify a DLCI for each of the priority levels, the last DLCI specified in the command line is used as the value of the remaining arguments. For example, the following two commands are equivalent:. Use the frame-relay route interface configuration command to specify the static route for PVC switching.
Use the no form of the command to remove a static route. The following example illustrates the commands you enter for a complete configuration that includes two static routes for PVC switching between serial interface 1 and serial interface To instruct the network server to request the short status message from the switch see Version 2. Use the no form of the command to override the default.
The following example returns the interface to the default state of requesting full status messages. Use the no form of the command to disable switching. The following example shows the simple command that is entered in the configuration file before the Frame Relay configuration commands to enable switching:. The following is sample output from the show frame-relay lmi command when the interface is a DTE:. The following is sample output from the show frame-relay lmi command when the interface is an NNI:.
Table describes significant fields shown in the displays. The following is sample output from the show frame-relay ip tcp header-compression command:. Table describes the fields shown in the display. Use the show frame-relay map EXEC command to display the current Frame Relay map entries and information about these connections. Table describes significant fields shown in the display. When the interface is configured as a pure DCE, the PVC status is determined by the status of incoming and outgoing interfaces and line status.
If the outgoing interface is a tunnel, the final PVC status is determined by what is learned from the tunnel. If the tunnel goes down, it is reflected by its line protocol when it does not have a route to the other end of the tunnel. Enter the show frame-relay route EXEC command at the system prompt to display all configured Frame Relay routes, along with their status.
The following is sample output from the show frame-relay route command:. Use the show frame-relay traffic EXEC command to display the access server's global Frame Relay statistics since the last reload.
Use the show interfaces serial EXEC command to display information about a serial interface. The status information is taken from the LMI, when active. The display shows the statistics for the LMI as the number of status inquiry messages sent LMI sent , the number of status messages received LMI recvd , and the number of status updates received upd recvd.
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See the Frame Relay Interface specification for additional explanations of this output. See the description for the show interfaces command for a description of the other fields displayed by this command. Optional Uses Cisco's own encapsulation, which is a four-byte header, with two bytes to identify the DLCI and two bytes to identify the packet type.
This is the default. Use this keyword when connecting to another vendor's equipment across a Frame Relay network. You must supply one of the following: fragments --Classify fragmented IP packets. Indicates the IP address of the serial interface of a new access server onto which an access server configuration file is to be autoinstalled over a Frame Relay network. See the "Usage Guidelines" section for information about when to use this option.