3Com Router 3031, Command Reference Manual

Page: 518 / 838

518 C
HAPTER
5: N
ETWORK
P
ROTOCOL
Description
Using the link-protocol sdlc command, you can change the link layer
encapsulation protocol of the synchronous serial interface into SDLC.
By default, the encapsulated link layer protocol of the synchronous serial interface
is PPP.
The SDLC is a kind of link layer protocol relative to the SNA, with working principal
similar to that of the HDLC. In order for the DLSw to work normally, the link layer
encapsulation protocol of the synchronous serial interface should be changed into
SDLC.
Note all the IP related commands on the interface should be removed before
encapsulating the SDLC, as the SDLC link protocol cannot be used to carry the IP
protocol, for example, to delete the IP address on the interface, etc.
Example
Configure the encapsulation protocol on the Serial1/0/0 as SDLC.
[3Com-Serial1/0/0] link-protocol sdlc
llc2 max-ack Syntax
llc2 max-ack length
llc2 max-ack
View
Ethernet Interface view
Parameter
■
length: Length of the LLC2 advanced response window, ranging from 1 to 127.
Description
Using the llc2 max-ack command, you can configure the length of the advance
response window before the LLC2 sending the acknowledgement frame. Using
the undo llc2 max-ack command, you can restore the default length of the
advance response window before the LLC2 sending the acknowledgement frame.
By default, the length of the LLC2 advance response window is 3.
The LLC2 advance response window refers to the maximum receivable information
frames before sending the acknowledgement frame, that is, to send the response
packet in advance on receiving the packet n.
Example
Configure the length of the advanced response window before the LLC2 sends
the acknowledgement frame as 5.
[3Com-Ethernet1/0/0] llc2 max-ack 5
llc2 max-send-queue
Syntax
llc2 max-send-queue length
undo llc2 max-send-queue