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The Link Quality Report (LQR) protocol is a part of the Point-to-Point Protocol (PPP), which allows two computers to connect to each other. LQR allows peers at either end of the PPP link to assess the state and quality of the PPP link.
LQR only transmits counts of packets sent, received, and rejected with errors. It does not report on signal noise or attenuation.
In order to produce Link Quality Reports, a PPP peer has to implement Link Quality Monitoring. Link Quality Monitoring consists of maintaining a number of counters. These counters include:
Packets TransmittedPackets receivedOctets (or bytes) transmittedOctets receivedNumber of LQRs transmittedNumber of LQRs receivedNumber of Octets received without error.The use of LQRs are negotiated when the PPP link is first established. Any peer that wants to receive LQR packets signals this by sending a PPP configuration Option with the following data:
Type - always 4Length - always 8Quality Protocol - 0xC025 for Link Quality ReportsReporting period - the maximum time between LQR packets, in hundredths of seconds. The remote peer may send them more often. If set to zero, then the remote peer should send an LQR whenever it receives an LQR from the other peer.An LQR is one packet containing the counters above, as well as:
a Magic Number that is used to detect looping conditionsthe last transmitted count of LQRs, packets and Octets transmittednumber of packets discardedNumber of packets found to have errors.In addition, the receiving peer will add the following fields to the LQR packet when it arrives:
The number of LQRs that have been received.The number of Packets that have been receivedthe number of received packets discardedThe number of received packets found to have errorsthe number of received Octets.These numbers come from the MIB database that the PPP receive logic maintains. They are saved for use in the next LQR packet that the peer sends.
referencePosted on 14 Sep 2024, this text provides information on Miscellaneous in Networking related to Networking. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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