|
|
 |
Note The Frame Relay module (FRM) is no longer available for sale through Cisco Systems, Inc. However, the card set is supported in Switch Software Release 9.3.30 or later to allow legacy users to migrate their networks into the latest switch software release. If you have questions regarding the availability of the FRM, please contact your Cisco account representative. |
This chapter provides information on provisioning and managing Frame Relay (FR) connections on an IGX node.
This section provides information on how to provision FR service on an IGX node. Information in this section applies to the UFM and the FRM card sets. For more information about these cards, see the "Universal Frame Module" section and the "Frame Relay Module" section.
The IGX supports the following FR features:
An IGX node provides a Permanent Virtual Circuit (PVC) FR Service for interconnecting user devices (routers, bridges, and packet switches). The PVCs are internally created on the node and rely on FastPacket switching. The user device connects to the FR back card in the node. The back card provides the adaptation layer function to convert between the FR format and the FastPacket format.
Because FR is a purchased option, Cisco must enable it on each applicable WAN Switching node.
A variety of external user devices can operate with an IGX node. The configuration on these devices must be appropriate for the type of interface on the back card.
The FR information in this chapter applies to the FRM or UFM card sets for the IGX. For information on the FRSM for the MGX 8220 shelf, refer to the Cisco MGX 8220 Command Reference .
|
Note A connection is the same as a PVC (permanent virtual circuit). |
For each FR connection you add, you must specify an FR class. An FR class is a set of parameters that specify the bandwidth and congestion-prevention characteristics for a connection. Cisco provides ten predefined classes, but you can modify any of the ten FR classes with the cnfcls command. To see the parameters in all connection classes, run the dspcls command. An FR class is relevant only at the time you add a connection with the addcon command. Once the connection exists, the system uses the parameters but does not keep track of the class number.
Apart from using the cnffrcls command, you can change one or more FR parameters with the addcon command. When you add an FR connection with addcon, a prompt appears requesting an FR class. At this prompt you can do one of the following:
If you are overriding class parameters, but want to keep the existing value of the parameter, use the asterisk to cause the connection to use the existing value of the parameter in that class. Most parameters are bidirectional and have the format parameter/parameter. If you want to keep a value for both directions, enter a single *. If you want to change a value for only one direction, enter the parameter in the form */new_parameter or new_parameter/*. When you type individual parameters, you need to enter characters only up to the last changed item. Before the last item, you must enter new values or * as a placeholder.
The parameters in the list that follows make up an FR class. Collectively, the name of these parameters is frp_bw. For most parameters, you can specify the value for each direction of the connection, so most parameter names appear in the format parameter/parameter. ForeSight (FST) is the exception because ForeSight automatically applies to both directions.
The full range of values for FR cards is 0-2048 kbps. Note that a CIR of 0 is not a standard setting. The standard range is 2.4 kbps-2048 kbps. CIR = 0 is a valid parameter only if the connection terminates at both ends on either a UFM or FRM. Before you can specify CIR = 0 with either addcon or cnffrcls, you must enable IDE-to-DE mapping with the cnffrport command. If you do not first enable IDE-to-DE mapping, the range for CIR is 2.4 Kbps-2048 kbps. Additionally, the CIR = 0 specification is necessary at only one end of the connection.
Bc/Bc is defined as fr_Bc_Tx /fr_Bc_Rx. If you have selected FR Forum standard parameters (through the cnfsysparm command), the Committed Burst (Bc) parameter is used instead of vc_q. Bc is defined as the amount of data the network can accept over a variable time interval Tc for committed delivery on a specific PVC. Specify Bc in bytes in the range 1-65535. Bc has meaning for only FST connections. The relationship between Bc and VC_Q is Bc = VC_Q / ((1 - (CIR/port speed)).
Be/Be is defined as fr_Be_Tx /fr_Be_Rx. If you have selected FR Forum standard parameters (through the cnfsysparm command), the PVC uses Excess Burst (Be) instead of PIR. Be is the amount of transmit/receive data above the number of bytes set by Bc if enough extra bandwidth is available. Specify Be in bytes within the range 1-65535. Delivery of Be-data is not guaranteed. Be has meaning to only ForeSight. The relationship between Be and PIR is Be = Bc * ((PIR/CIR) - 1).
On the IGX, FR is supported on FRM and UFM card sets. On the FRM and UFM, both physical and logical ports can exist.
FR connections can exist between the following cards:
Table 9-1 FR Endpoints and Connection Types
| Endpoints | Supported Connection Types |
|---|---|
FRM, UFM, FRSM |
3. Configure channel utilization.
This section outlines the steps for setting up and deleting FR ports and adding connections.
Use either a Cisco WAN Manager workstation an IGX control terminal to do the following tasks. For detailed command descriptions, see the Cisco WAN Switching Command Reference .
Step 2 If the card is a UFM-C, "up" (or activate) each line with the upln command. The range of lines for a UFM-4C is 1 to 4. The range of lines for a UFM-8C is 1 to 8. A UFM-U does not require activation with the upln command.
Step 3 If the card is a UFM-C, assign logical FR ports to individual physical lines by using the addport command. An optional command you can use for a UFM-C either before or after is the cnfln command.
Step 4 If the card is a UFM-U, use the cnfmode command to configure the mode of the card if you do not use the default of mode 1. You must understand the ramifications of this step before you use cnfmode. If you do not understand the modes of the UFM-U, see the "Universal Frame Module" section.
Step 5 For optional Y-cable redundancy, configure the two cards by using the addyred command. For Y-cable redundancy on a HSSI card, you must use port 1 of the cards for the primary and redundant ports.
Step 6 Activate a FR port with the upport command. Use the cnfport command to specify the FR parameters for the FR service.
Step 7 Use the dspcls command to view the existing FR classes. Decide on a class if a suitable class exists, otherwise create a suitable class using the cnffrcls command. Use the class number in the addcon command.
Step 8 Use the vt command to access the node at the remote end of the proposed FR connection, then repeat steps 1 and 2.
Step 9 Use the addcon command on the local node to add the FR connection.
Step 10 (Optional) Use the cnfchutl command to enter the expected channel utilization of an FR circuit into the system. This command helps the system allocate the proper bandwidth to the circuit.
Step 11 (Optional) Use the cnfchpri to assign a high priority to a circuit or to re-assign a high priority circuit to low priority.
Step 12 Configure the port for DCE or DTE mode, speed, clocking, LMI type, and so on, by using the cnfport command. Alternatively, you can keep the default parameters.
Step 13 Add connections by using the addcon command. Adding connections requires the slot number, logical port number, and DLCI for each end of the connection. FR is a purchased option.
Step 14 (Optional) For an individual connection, you can configure bandwidth parameters or enable ForeSight (if purchased) by using the cnffrcon command.
Use the logical port number to activate a port (upport), add connections (addcon), or display statistics (dspportstats). For example, after you add logical port 14.60 2.1-24 with addport, you up this logical port by entering "upport 14.60." The maximum number of logical port numbers on a UFM-C is 250. Use dspports to display logical ports.
Before deleting a logical port with delport, you must de-activate the physical port with dnport.Delete a logical port by executing the delport command. Executing delport dissolves any groups of time slots and unassigns all time slots on the logical port.
|
Note Before you delete a FR port, you must delete any connections on the port with the delcon command. |
The position of a small jumper board at each port determines whether it is a DCE or a DTE.
 |
Caution To prevent damage to the FRI cards, ground yourself before handling IGX cards by clipping a grounding strap to your wrist, and clipping the wrist strap lead to the enclosure. |
A small jumper card near each connector on the back card selects the port's mode. The factory-set modes alternate between DCE and DTE. The steps that follow describe how to change the mode of a port. The relation between back card row numbers and the port mode is as follows:
|
Note Jumper cards for selecting the mode of a V.35 or X.21 interface have an impedance of either 100 ohms or 200 ohms. On ports with Y-cable redundancy, the impedance is important. With Y-cable redundancy, use the 200-ohm jumper card. Without Y-cable redundancy, the 100-ohm jumper card is adequate. |
|
Note Carefully choose the mode for each port. If you change a port mode after other ports on the card are carrying traffic, it disrupts service on the other ports. |
To change the mode of an interface, reposition the jumper board for the port as follows:
Step 2 To change to DTE, move the jumper board one row of pins away from the FRI faceplate (see Figure 9-1). For DTE mode, the jumper board should occupy rows 2, 3, 5, and 6.
To change to DCE, plug the jumper board into the connector receptacle pin rows closest to the FRI faceplate (see Figure 9-1). The rows for DCE mode are 1, 2, 4, and 5.
Step 3 Insert the FRI card and gently slide it in all the way to the rear of the slot.
Step 4 Insert and tighten the mounting screws.
This section outlines the steps for setting up and deleting FR ports, adding and configuring connections. As the steps show, some commands apply to channelized connections (T1, E1, or J1) but not to unchannelized connections (V.35 or X.21). Use either the IGX control terminal or a Cisco WAN Manager workstation to execute the commands. For parameters and other details on the commands, refer to the Cisco WAN Switching Command Reference .
Step 2 Use the vt command to gain access to other nodes.
Step 3 Use the dspcds command to verify that all nodes have the correct FRI back card and FRM front card. The dspcds output shows the slot number of each card and any mismatch between the front card and the back card. Note the slot number of each FRM or UFM for subsequent commands.
Step 4 For V.35 and X.21 interfaces, check the mode (DCE or DTE) of each relevant port by using the dspfrport command. (For T1 and E1 lines, the mode is not applicable.) On an FRI-X.25 or FRI-V.35 back card, a jumper board near each connector determines the mode of the port. See the "Port Mode Selection for V.35 and X.21" section .
Step 5 For optional Y-cable redundancy, configure the two slots for redundancy by using the addyred command. For V.35 and X.21 interfaces, go to Step 8.
Step 6 For T1, E1, and J1 interfaces, bring up the line using the upln command.
Step 7 For T1, E1, and J1 interfaces, configure the line using the cnfln command.
Step 8 For T1, E1, and J1 interfaces, add the logical FR port using the addport command.
Step 9 Activate the port using the upport command.
Step 10 Configure the port for speed, clocking, LMI type, and so on, by using the cnfport command. Alternatively, you can keep the default parameters.
Step 11 Determine which FR class number to use when you add connections to a port. To see the parameters that a class specifies, use the dspcls command. To modify parameters in a class, use the cnfcls.
Step 12 Add connections to the port by using the addcon command. Enter the slot number and specify a DLCI for each end of the connection.
Step 13 For an individual connection, you can configure bandwidth parameters or enable ForeSight (if purchased) by using the cnffrcon.
Step 14 Optionally, you can set the channel priority by using the cnfchpri command. Normally, the system-default priority is adequate.
Full command descriptions for the switch software commands listed in Table 9-2 can be accessed at one of the following links:
For installation and basic configuration information, see the Cisco IGX 8400 Series Installation Guide, Chapter 1, "Cisco IGX 8400 Series Product Overview"
For more information on switch software commands, refer to the Cisco WAN Switching Command Reference, Chapter 1, "Command Line Fundamentals ."
Posted: Mon May 12 15:38:00 PDT 2003
All contents are Copyright © 1992--2003 Cisco Systems, Inc. All rights reserved.
Important Notices and Privacy Statement.
