LLC2 configuration command Directory

llc2 idle-time

llc2 t1-time

llc2 tbusy-time

llc2 tpf-time

llc2 trej-time

llc2 n2

llc2 local-window

llc2 holdqueue

llc2 ack-delay-time

llc2 ack-max

show llc

debug llc2

 

llc2 idle-time

 

The command is used for controling the query frequency at idle time (no data is exchanged) The “no” format of the command can be used for restoring the default value.

 

llc2 idle-time seconds

no llc2 idle-time

 

“Seconds” refers to the interval (seconds) for sending RR frame at idle time. The maximum interval is 60 seconds; the minimum one is 1 second.

 

default:

10 seconds

 

command mode:

 Interface configuration Mode

 

explanation

At idle time, No I (nformation) frame is exchanged and RR ready receipt) frame is sent to remote terminal periodically to inform the remote terminal to get ready for receiving data. The relative small value shall be set to ensure the prompt advice to the remote terminal. The too small value is likely to lead to too many RR frames to be transmitted on the network.

 

example

Set it to transmit RR frame every 12 seconds.

int ethernet1/1

llc2 idle-time 12

 

llc2 t1-time

 

The command is used for controlling the time of waiting for the conformation of the remote terminal. The “no” format of the command can be used for restoring to the default value.

      

llc2 t1-time seconds

no llc2 t1-time

 

 Seconds is the time of waiting for the confirmation of remote terminal. The maximum time is 60 seconds while the minimum is 1 second.

 

default:

1 second

 

command mode:

Interface configuration Mode

 

explanation

The confirmation of remote terminal is expected after I frame is sent each time. If no confirmation is received in a specific time, I frame will be re-sent. The relative bigger value shall be set for the network on which the data transmit is quite slow.

 

example

Setting the time of 12 seconds of waiting for confirmation

Router_config#int ethernet1/1

Router_config _e1/1#llc2 t1-time 12

 

llc2 tbusy-time

 

The command is used for controling the waiting time when the remote terminal is busy. The “no” format of the command can be used for restoring to the default value.

      

llc2 tbusy-time seconds

no llc2 tbusy-time

      

The time of waiting is in seconds when the remote terminal is busy. The maximum time is 60 seconds, the minimum is 1 second.

 

default:

10 seconds

 

command mode:

Interface configuration Mode

 

explanation

A LLC2 connective terminal is able to inform the opposite terminal that local terminal is busy and prevent the opposite terminal from transmitting data to local terminal and send “RNR” (receipt not ready) to the opposite terminal. The relative bigger value can be set for averting the timeout.

 

example

Setting the time of 12 seconds of busy remote terminal

Router_config#int ethernet1/1

Router_config _e1/1#llc2 tbusy-time 12

 

llc2 tpf-time

The command is used for controlling the time of waiting for the response of the remote terminal. The “no” format of the command can be used for restoring to the default value.

 

      

llc2 tpf-time seconds

no llc2 tpf-time

      

Seconds is the time of waiting for the response of the remote terminal. The maximum time is 60 seconds while the minimum is 1 second.

 

default:

1 second

 

command mode:

Interface configuration Mode

 

explanation

When an LLC2 connection terminal sometimes needs to know the status of the opposite terminal, it shall send a command frame for the response of the opposite terminal and wait for the response of the opposite terminal simultaneously. When the opposite terminal receives the command frame, it will make a response frame. If the error occurs, the transmit terminal will keep waiting. In order to avoid this situation, a clock needs to be started for prompting the transmit terminal to send another command frame when the arrival time is hit. The command is used for setting the time of waiting for the response frame of the opposite terminal.

example

Setting the time of 12 seconds of waiting for response of the opposite terminal.

 

Router_config#int ethernet1/1

Router_config _e1/1#llc2 tpf-time 12

 

llc2 trej-time

The command is used for controlling the time of waiting for the response of the remote terminal to the rejection frame.      

llc2 trej-time seconds

no llc2 trej-time

      

the waiting time is in seconds when the remote terminal is busy. The maximum time is 60 seconds, the minimum is 1 second.

default:

3 seconds

 

command mode:

       Interface configuration Mode

 

explanation

The data receipt and transmit of the two terminal of LLC2 links is based on the specific sequence. When the sequence number of opposite I frame received by a LLC2 connection terminal is not the expected value, the LLC2 connection terminal will send a REJ(rejection) frame to the opposite terminal and start a clock. If no response is made at the arrival time, LLC2 link will be disconnected. The command is used for setting the time of waiting for the response to REJ (rejection) frame.

 

example

Setting the waiting time of 12 seconds

Router_config#int ethernet1/1

Router_config _e1/1#llc2 trej-time 12

 

llc2 n2

 

The command is used for controlling the times of retransmit of the frame. The “no” format of the command can be used for restoring the default value.

      

llc2 n2 retry-count

no llc2 n2

      

retry-count is the time of retransmit of frame, the maximum is 255 times and the minimum is 1 time.

 

default:

8

 

command mode:

Interface configuration Mode

 

explanation

When one terminal of LLC2 link sends data to the opposite terminal, it will wait for the confirmation of the opposite terminal. If the opposite terminal does not send the confirmation information in the specified time, the local will re-send the data, but the times of retry shall be limited. When the retry times exceed retry-count, LLC2 link will be disconnected. The command is used for setting the retry times (retry-count).

 

 

example

Setting the retry times as 12

Router_config#int ethernet1/1

Router_config _e1/1#llc2 n2 12

 

llc2 local-window

 

The command is used for controlling the maximum number (namely the size of window for transmit)  when I frame is not confirmed. The “no” format of the command can be used for restoring to the default value.

      

llc2 local-window packet-count

no llc2 local-window

      

packet-count is the maximum number of I frame transmit at the time of not being confirmed, the maximum number is 127, the minimum one is 1.default:

7

 

command mode:

Interface configuration Mode

 

explanation

When one terminal of LLC2 link sends data to the opposite terminal, only some specific amount of data can be sent before the confirmation of the opposite terminal/ The command is used for setting the maximum value. However, when the value is set too big, it will result in the loss of data as the opposite terminal is not able to receive all the data.

 

example

Setting the size of the window for transmit as 12

Router_config#int ethernet1/1

Router_config _e1/1#llc2 local-window 12

 

llc2 holdqueue

 

The command is used for controlling the maximum number the local can accumulate when I frame cannot be sent (the remote terminal is busy). The “no” format of the command can be used for restoring to the default value.

      

llc2 holdqueue packet-count

no llc2 holdqueue

      

packet-count is the maximum number reserved by I frame at the time of not being confirmed. The maximum number is 200, the minimum one is 20.

 

default:

40

 

command mode:

Interface configuration Mode

 

explanation

One terminal of LLC2 link is not able to send data (I frame) when the opposite terminal is busy. All the data shall be reserved before the opposite terminal clears busy. But the number to be reserved has specific limitations. The command is used for setting the number of the data to be reserved.

 

example

Setting the maximum number of the data to be reserved as 120

Router_config#int ethernet1/1

Router_config _e1/1#llc2 holdqueue 120

 

llc2 ack-delay-time

 

The command is used for controlling the time delay for I frame confirmation. The “no” format of the command can be used for restoring to the default value.

llc2 ack-delay-time time

no llc2 holdqueue

   

The maximum milliseconds the command “time” allows the unconfirmed I frame to reserve.

default:

400

command mode:

Interface configuration Mode

explanation:

When one terminal of LLC2 link receives I frame sent from the opposite terminal, the confirmation frame (RR frame, receive ready frame) does not need to be sent immediately for waiting some time. If no data is sent for confirmation during the said time, the confirmation frame (RR frame, receive ready frame) shall be sent, or when I frame is sent from the opposite terminal reaches the value of llc2 ack-max during the said time, the confirmation frame (RR frame) shall be sent immediately. The command can be used for reducing the unnecessary data interactive at the time of big data flow.

 

example

Setting the time delay as 1 second at the time of confirmation

Router_config#int ethernet1/1

Router_config _e1/1#llc2 ack-delay-time 1000

 

llc2 ack-max

The command is used for controlling the allowed maximum I frame before confirming I frame. The “no” format of the command can be used for restoring to the default value.

 

llc2 ack-max number

no llc2 holdqueue

   

The maximum number allowed by the command “number” before confirming I frame. The maximum number is 127, the minimum one is 1.

default:

3

command mode:

Interface configuration Mode

explanation

When one terminal of LLC2 link is waiting for the confirmation of the opposite terminal, a given number of I frame can be sent. When the receipt terminal receives the confirmation or the maximum number of I frames, the confirmation frame (RR frame) will be sent. The command can be used for reducing the unnecessary data interactive at the time of big data flow.  

example

Setting the confirmed maximum number as 7.

Router_config#int ethernet1/1

Router_config _e1/1#llc2 ack-max 7

 

show llc

 

The command is used for displaying the relevant information of LLC2 link connection.

 

show llc interface [type number]

type               Interface Type

       number          Interface number

 

default:

none

 

command mode:

       supervisor modeglobal configuration ModeInterface configuration Mode

 

explanation

Showing the relevant information of LLC2 kink connection. The command “show llc” is used for displaying the information of LLC2 link of the interface under interface mode.

 

example

Under Interface configuration Mode, the command “show llc” is used for displaying llc2 information on the interface ethernet1/1.

Router#sho llc ethernet1/1

Router_config# sho llc ethernet1/1

Router_config#int ethernet1/1

Router_config _e1/1#sho llc ethernet1/1

 

debug llc2

The command is used for opening debug switch of LLC2

      

debug llc2 [packet][error][state]

 

default:

none

 

command mode:

supervisor mode

 

explanation

“Packet” opens the debug switch of LLC2 link data information; “error” opens the debug switch of wrong information of LLC2 link; “state” opens the debug information of status information of LLC2 link.

 

example

Opening the debug switch of LLC2 link

Router#debug llc2 packet

Router#debug llc2 state

Router#debug llc2 error