LLC2 Parameters

You can access the LLC2 Parameters window from the Link Editor.

The parameter values are stored in the link configuration files /etc/opt/SUNWconn/x25/config/link_config_nnnn.cfg, where nnnn is the four-digit number that indicates the link number (for example, the file link_config_0004.cfg contains the parameters for link number 4).

The parameters described in this section configure the datalink and physical layers of a LAN link.

Ack Timer (T1) (t1_timer)

The period, in tenths of a second, during which the LLC2 software expects to receive an acknowledgment to an outstanding I-frame. The valid range for values of this parameter is between 1 and 3000.

Max Tries (N2) (n2_count)

Maximum number of times the LLC2 software sends a PDU following the expiration of the Ack Timer, the P-bit Timer, or the Reject Timer. The value of this parameter also limits the number of times Receive Ready with P-bit set is sent when the remote side is busy and the Busy Timer expires. The valid range for values of this parameter is between 1 and 255.

P-bit Timer (pf_timer)

The period, in tenths of a second, during which the LLC2 software expects to receive a frame with the F-bit set to 1 in response to a command with the P-bit set to 1. This value should be less than that specified for the Ack Timer. The valid range for values of this parameter is 1 to 3000.

Max UnACKed IPDUs (unack_max)

The maximum number of unacknowledged I-frames that can be received before the Receive Ready acknowledging those I-frames must be sent. The valid range for values of this parameter is 0 to 127.

Reject Timer (reject_timer)

The period, in tenths of a second, during which the LLC2 software expects to receive a reply to a sent Reject frame. The valid range for values of this parameter is 1 to 10000.

Transmit Probe (local_probe)

The position within a window at which the LLC2 software sends an I-frame with the P-bit set, to ask for an acknowledgment from the receiver. The valid range for values of this parameter is 0 to 127.

Busy-state Timer (busy_timer)

The period, in tenths of a second, during which the LLC2 software waits for an indication of the clearance of a busy condition at the other end of the link. The valid range for values of this parameter is 1 to 3000.

Link Idle Timer (idle_timer)

The period, in tenths of a second, during which the LLC2 software expects to receive a frame from the other end of the link. If this timer expires, the Poll/Final cycle is initiated. A zero value disables this function. The valid range for values of this parameter is 0 to 32000.

Max RR Delay (rr_ack_delay)

The maximum delay, in tenths of a second, before transmitting a delayed Reset Request. The value for this parameter must be significantly lower than the Ack Timer value. The valid range for values of this parameter is between 0 and 3000.

XID Parameters

XID Window Size (xid_window)

This determines the receive window size. That is, the maximum number of unacknowledged I-frames that the remote end of the link can send. The valid range for values of this parameter is 1 to 127.

Duplicate MAC XID Count (xid_ndup)

This indicates the number of times the LLC2 software tries to find stations with duplicate MAC addresses. A value of 0 means no attempt is made. The valid range for values of this parameter is 0 to 255.

Duplicate MAC XID Timer (xid_tdup)

The period, in tenths of a second, during which incoming XID response frames are checked for a duplicate response to the station LSAP. A value of 0 tells the LLC2 software not to perform the duplicate address check. The valid range for values of this parameter is 0 to 3000.