Configure DLC
Tast
list of DLC configuration
DLC module is designed to make better use of bandwidth. By applying the functionality of DLC, the information data encapsulated in data link layer protocol such as PPP Protocol, can be compressed by the DLC module before being sent to physical layer for transmission; Or the compressed data in information field of packet received from physical layer can be decompressed by the DLC module before being delivered to network layer. PPP protocol is supported by such module for compression data transmission. Lempel-Ziv(compatible with STAC LZS) compression protocol and MPPC compression protocol have been implemented. All the physic or logical interface that can be encapsulated with PPP protocol, can be configured with compression protocol. Generally speaking, the ratio of compression will be 2:1.
Tast list of DLC configuration
The configuration step that configure
compression protocol for interface is below。
step |
command |
function |
1 |
Encapsulation
PPP |
Encapsulation
PPP protocol(note 1) |
2 |
Dlc-compress
Lempel-Ziv | MPPC |
Configure
compression protocol (note 2) |
Note
1: First enter interface configuration mode and encapsulated PPP Protocol.
Assure CCP Protocol has been implemented(RFC1962)
Suppose that router A and B are available. A is D-Link Router,B is CISCO router,A and B are connected by synchro serial line. Suppose that one serial interface number of A is S2/0:1与one serial interface number of B is S1/1:1; Both two interfaces are encapsulated by PPP protocol.(CCP protocol(RFC1962)is implemented in software module of the two routers)
If configured with Lempel-Ziv(STAC LZS) compression, basic configurations of the two interfaces are as below:
A) Serial interface S2/0:1of D-Link is configured as :
interface Serial2/0:1
ip
address 18.0.0.1 255.255.255.0
no
ip directed-broadcast
encapsulation
ppp
bandwidth
64
dlc-compress
Lempel-Ziv
B) Serial
interface S1/0:0 of CISCO is configured as:
interface Serial1/1:1
ip
address 18.0.0.2 255.255.255.0
encapsulation
ppp
compress
stac
If configured with MPPC compression protocol, basic configurations of the two interfaces are as below:
A) Serial interface S2/0:1of D-Link is configured as :
interface Serial2/0:1
ip
address 18.0.0.1 255.255.255.0
no
ip directed-broadcast
encapsulation
ppp
bandwidth
64
dlc-compress
MPPC
B) Serial
interface S1/0:0 of CISCO is configured as:
interface Serial1/1:1
ip
address 18.0.0.2 255.255.255.0
encapsulation
ppp
compress MPPC