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This chapter describes the function and displays the syntax for Logical Link Control, type 2 (LLC2) and Synchronous Data Link Control (SDLC) commands. For more information about defaults and usage guidelines, see the corresponding chapter of the Bridging and IBM Networking Command Reference.
Use the encapsulation sdlc interface configuration command to configure an SDLC interface.
encapsulation sdlcUse the encapsulation sdlc-primary interface configuration command to configure the router as the primary SDLC station if you plan to configure the SDLLC media translation feature.
encapsulation sdlc-primaryUse the encapsulation sdlc-secondary interface configuration command to configure the router as a secondary SDLC station if you plan to configure the SDLLC media translation feature.
encapsulation sdlc-secondaryUse the llc2 ack-delay-time interface configuration command to set the amount of time the Cisco IOS software waits for an acknowledgment before sending the next set of information frames.
llc2 ack-delay-time milliseconds| milliseconds | Number of milliseconds the software allows incoming information frames to stay unacknowledged. The minimum is 1 ms and the maximum is 60000 ms. The default is 100 ms. |
Use the llc2 ack-max interface configuration command to control the maximum amount of information frames the Cisco IOS software can receive before it must send an acknowledgment.
llc2 ack-max packet-count| packet-count | Maximum number of packets the software will receive before sending an acknowledgment. The minimum is 1 packet and the maximum is 127 packets. The default is 3 packets. |
Use the llc2 idle-time interface configuration command to control the frequency of polls during periods of idle time (no traffic).
llc2 idle-time milliseconds| milliseconds | Number of milliseconds that can pass with no traffic before the LLC2 station sends a Receiver Ready frame. The minimum is 1 ms and the maximum is 60000 ms. The default is 10000 ms. |
Use the llc2 local-window interface configuration command to control the maximum number of information frames the Cisco IOS software sends before it waits for an acknowledgment.
llc2 local-window packet-count| packet-count | Maximum number of packets that can be sent before the software must wait for an acknowledgment. The minimum is 1 packet and the maximum is 127 packets. The default is 7 packets. |
Use the llc2 n2 interface configuration command to control the amount of times the Cisco IOS software retries sending unacknowledged frames or repolls remote busy stations.
llc2 n2 retry-count| retry-count | Number of times the software retries operations. The minimum is 1 retry and the maximum is 255 retries. The default is 8 retries. |
Use the llc2 t1-time interface configuration command to control the amount of time the Cisco IOS software will wait before resending unacknowledged information frames.
llc2 t1-time milliseconds| milliseconds | Number of milliseconds the software waits before resending unacknowledged information frames. The minimum is 1 ms and the maximum is 60000 ms. The default is 1000 ms. |
Use the llc2 tbusy-time interface configuration command to control the amount of time the Cisco IOS software waits until repolling a busy remote station.
llc2 tbusy-time milliseconds| milliseconds | Number of milliseconds the software waits before repolling a busy remote station. The minimum is 1 ms and the maximum is 60000 ms. The default is 9600 ms. |
Use the llc2 tpf-time interface configuration command to set the amount of time the Cisco IOS software waits for a final response to a poll frame before resending the poll frame.
llc2 tpf-time milliseconds| milliseconds | Number of milliseconds the software waits for a final response to a poll frame before resending the poll frame. The minimum is 1 ms and the maximum is 60000 ms. The default is 1000 ms. |
Use the llc2 trej-time interface configuration command to control the amount of time the Cisco IOS software waits for a correct frame after sending a reject command to the remote LLC2 station.
llc2 trej-time milliseconds| milliseconds | Number of milliseconds the software waits for a resend of a rejected frame before sending a reject command to the remote station. The minimum is 1 ms and the maximum is 60000 ms. The default is 3200 ms. |
Use the llc2 xid-neg-val-tim interface configuration command to control the frequency of exchange of identification (XID) transmissions by the Cisco IOS software.
llc2 xid-neg-val-time milliseconds| milliseconds | Number of milliseconds after which the software sends XID frames to other LLC2-speaking stations. The minimum is 0 ms and the maximum is 60000 ms. The default is 0 ms. |
Use the llc2 xid-retry-time interface configuration command to set the amount of time the Cisco IOS software waits for a reply to exchange of identification (XID) frames before dropping the session.
llc2 xid-retry-time milliseconds| milliseconds | Number of milliseconds the software waits for a reply to XID frames before dropping a session. The minimum is 1 ms and the maximum is 60000 ms. The default is 60000 ms. |
Use the sdlc address interface configuration command to assign a set of secondary stations attached to the serial link. Use the no form of this command to remove an assigned secondary station.
sdlc address hexbyte [echo]| hexbyte | Hexadecimal number (base 16) indicating the address of the serial link. |
| echo | (Optional) Treats nonecho and echo SDLC addresses as the same address. |
Use the sdlc address ff ack-mode interface configuration command to configure the IBM reserved address ff as a valid local address.
sdlc address ff ack-modeUse the sdlc dlsw interface configuration command to attach SDLC addresses to DLSw+. Use the no form of this command to cancel the configuration.
sdlc dlsw sdlc-address sdlc-address ...| sdlc-address | SDLC address in hexadecimal. The valid range is 1 to FE. |
Use the sdlc dte-timeout interface configuration command to adjust the amount of time a data terminal equipment (DTE) interface waits for the data circuit-terminating equipment (DCE) to assert a Clear To Send (CTS) signal before dropping a Request To Send (RTS).
sdlc dte-timeout unit| unit | Timeout wait interval in microseconds. The valid range is 10 to 64000. Each unit is approximately 5 microseconds. The default is 10 units. |
Use the sdlc frmr-disable interface configuration command to indicate that secondary stations on a particular serial link do not support Frame Rejects (FRMRs) or error indications. Use the no form of this command to specify that the secondary station does support FRMRs.
sdlc frmr-disableUse the sdlc holdq interface configuration command to control the maximum number of packets that can be held in a buffer before being transmitted to a remote SDLC station.
sdlc holdq address queue-size| address | SDLC address for which you are specifying a queue size. |
| queue-size | Local send window size. The minimum is 1 packet. No maximum value has been established. The default is 200 packets. |
Use the sdlc k interface configuration command to set the window size in order to control the maximum number of information frames the Cisco IOS software transmits before it must stop transmitting and wait for an acknowledgment from the receiving router.
sdlc k window-size| window-size | Local send window size. The minimum is 1 frame. The maximum is 7 frames, which is the default. |
Use the sdlc line-speed interface configuration command to enable adaptive SDLC T1.
sdlc line-speed rate| rate | Clockrate in bits per second. |
Use the sdlc n1 interface configuration command to control the maximum size of an incoming frame.
sdlc n1 bit-count| bit-count | Number indicating bit size. Frames that exceed this size are rejected. The minimum is 1 bit. The maximum is 12000 bits, which is the default. |
Use the sdlc n2 interface configuration command to determine the number of times that the Cisco IOS software resends a frame before terminating the SDLC session.
sdlc n2 retry-count| retry-count | Number of retry attempts. When this number is exceeded, the SDLC station terminates its session with the other station. The minimum is 1 and the maximum is 255. The default is 20 retries. |
Use the sdlc partner interface configuration command to specify the destination address with which an LLC session is established for the SDLC station. Use the no form of this command to cancel the configuration.
sdlc partner mac-address sdlc-address| mac-address | The 48-bit Media Access Control (MAC) address of the Token Ring host. |
| sdlc-address | SDLC address of the serial device that will communicate with the Token Ring host. The valid range is 1 to FE. |
Use the sdlc poll-limit-value interface configuration command to control how many times a single secondary station can be polled for input before the next station must be polled. Use the no form of this command to retrieve the default value.
sdlc poll-limit-value count| count | Number of times the Cisco IOS software can poll one secondary station before proceeding to the next station. The minimum is 1 time, which is the default. The maximum is 10 times. |
Use the sdlc poll-pause-timer interface configuration command to control how long the Cisco IOS software pauses between sending each poll frame to secondary stations on a single serial interface. Use the no form of this command to retrieve the default value.
sdlc poll-pause-timer milliseconds| milliseconds | Number of milliseconds that the software waits before sending the poll frame to a single serial interface. This is a number in the range 1 to 10000. The default is 10 ms. |
Use the sdlc poll-wait-timeout interface configuration command when the router has been configured for local acknowledgment and some form of SDLC communication (SDLLC or STUN, for example) to specify the interval the Cisco IOS software will wait for polls from a primary node before timing out that connection.
sdlc poll-wait-timeout milliseconds| milliseconds | Number of milliseconds the software will wait for a poll from the primary station before timing out the connection to the primary station. The minimum is 10 ms and the maximum is 64000 ms. The default is 10000 ms. |
To establish correspondence between an SDLC and QLLC connection, use the sdlc qllc-prtnr interface configuration command.
sdlc qllc-prtnr virtual-mac-address sdlc-address| virtual-mac-address | The virtual Media Access Control (MAC) address in the form h.h.h. |
| sdlc-address | SDLC address in hexadecimal. The valid range is 1 to FE. |
Use the sdlc role interface configuration command to establish the router to be either a primary or secondary SDLC station. Use the no form of this command to cancel the designation.
sdlc role {none | primary | secondary | prim-xid-poll}| none | Establishes the router as either a primary or secondary station, depending on the end stations. |
| primary | Establishes the router as a primary station. |
| secondary | Establishes the router as a secondary station. |
| prim-xid-poll | Establishes the router as a primary station when the end station is configured as a secondary NT2.1. |
Use the sdlc sdlc-largest-frame interface configuration command to indicate the largest information frame (I-frame) size that can be sent or received by the designated SDLC station. Use the no form of this command to return to the default value.
sdlc sdlc-largest-frame address size| address | Address of the SDLC station that will communicate with the router. |
| size | Largest frame size that can be sent or received. The default is 265 bytes. |
To enable an interface configured as a primary SDLC station to operate in two-way simultaneous mode, use the sdlc simultaneous interface configuration command.
sdlc simultaneous [full-datamode | half-datamode]| full-datamode | (Optional) Enables the primary station to send data to and receive data from the polled secondary station. |
| half-datamode | (Optional) Prohibits the primary station from sending data to the polled secondary station. |
Use the sdlc slow-poll interface configuration command to enable the slow-poll capability of the router as a primary SDLC station. Use the no form of this command to disable slow-poll capability.
sdlc slow-poll seconds| seconds | Amount of time in seconds. |
Use the sdlc t1 interface configuration command to control the amount of time the Cisco IOS software waits for an acknowledgment to a frame or sequence of frames.
sdlc t1 milliseconds| milliseconds | Number of milliseconds that the software waits. The minimum is 1 ms and the maximum is 64000 ms. The default is 3000 ms. |
Use the sdlc test serial EXEC command to determine the status of end stations. Use the sdlc test serial command with the stop keyword to halt the sending of the test frames.
sdlc test serial number address [iterations | continuous | stop | string string]| serial number | Serial interface on which the test frame is to be sent out. |
| address | SDLC address (in hexadecimal) of the end station to receive the test frame. |
| iterations | (Optional) Number of test frames to be sent. The valid range is 1 to 25 frames. The default is 10 frames. |
| continuous | (Optional) Sends frames continuously until the sdlc test serial command is issued with the stop keyword. |
| stop | (Optional) Halts the sending of test frames. |
| string string | (Optional) Specifies a string of characters as data within the test frame. If this option is not specified, the default test string is ABCDEFGHIJKLMNOPQRSTUVWXYZ. |
Use the sdlc vmac interface configuration command to configure a MAC address for the serial interface. Use the no form of this command to disable the configuration.
sdlc vmac mac-address| mac-address | 48-bit MAC address of the Token Ring host. |
Use the sdlc xid interface configuration command to specify an exchange ID (XID) value appropriate for the designated SDLC station associated with this serial interface. Use the no form of this command to disable XID processing for this address.
sdlc xid address xid| address | Address of the SDLC station associated with this interface. |
| xid | XID the Cisco IOS software will use to respond to XID requests the router receives. This value must be 4 bytes (8 digits) in length and is specified with hexadecimal digits. |
Use the show interfaces privileged EXEC command to display the SDLC information for a given SDLC interface.
show interfacesUse the show llc2 privileged EXEC command to display the LLC2 connections active in the router.
show llc2
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