Cabletron Systems HSIM-W6 manual Lqm, Multilink Protocol

Chapter 2: About the HSIM-W6

In half-duplex operation, the authenticator device challenges the peer device by generating a CHAP challenge, and the challenge contains an MD5 algorithm with a random number that has your encrypted password and system name. The peer device then applies a one-way hash algorithm to the random number and returns this encrypted information along with the system name in the CHAP response. The authenticator then runs the same algorithm and compares the result with the expected value. This authentication method depends upon a password or secret, known only to both ends locally.

Full-duplex operation places an additional step to the half-duplex operation that mirrors the operation discussed above for a peer to validate the authenticator. The peer device challenges the authenticator by generating a CHAP challenge, and the authenticator returns a CHAP response.

The peer device challenges the authenticator device by generating a CHAP challenge, and the challenge contains an MD5 algorithm with a random number that has your encrypted password and system name. The authenticator device then applies a one-way hash algorithm to the random number and returns this encrypted information along with the system name in the CHAP response. The peer device then runs the same algorithm and compares the result with the expected value. This authentication method depends upon a password or secret, known only to both ends locally.

LQM

Link Quality Monitoring (LQM) is a link control mechanism used with PPP to determine when and how often a link is dropping data in units of packets and octets. Link Quality Monitoring accomplishes this by providing Link-Quality-Reports to determine if the quality of the link is adequate for operation. Link Quality Monitoring provides separate measurements for both incoming and outgoing packets that are communicated to both ends of the link. The PPP LQM mechanism carefully defines the Link-Quality-Report packet formats, and specifies reference points for all data transmission and reception measurements. The LQM implementation maintains successfully received packet and octet counts, and periodically transmits this information to its peer using Link-Quality-Report packets.

Multilink Protocol

Multilink Protocol (MP) is an extension of PPP that controls the way frames are transferred across several links whenever a single link is not sufficient to meet the requirements of your present traffic load. Multilink Protocol establishes several simultaneous links between two end points over switched circuits (dial-up lines) in an ISDN network, and dynamically adjusts the bandwidth demands between available links to maintain an effective data transfer.

HSIM-W6 User’s Guide 13