name: LXT
full_form: Length ExTension
context: [Editor's note: This clause refers to deleted or expired ietf-drafts] In cases where a routed WAN interface is required, one may still use PPPmux, but tunnel it via L2TP [16]. This protocol is called Tunnelled Compressed RTP (TCRTP) -[17], figure 6-8. L2TP tunnels should be used to tunnel the cUDP payloads end to end. This is a natural choice since cUDP payloads are PPP payloads, and L2TP allows tunnelled transport of PPP payloads. L2TP includes methods for tunnelling messages used in PPP session establishment such as NCP. This allows the procedures of RFC2509 to be used for negotiating the use of cUDP within a tunnel and to negotiate compression/decompression parameters to be used for the cUDP flow. A companion draft [18] describes a method of compressing L2TP tunnel headers from 36 bytes (including the IP/UDP/L2TP headers) to 21 bytes. L2TPHC packets include an IP header, using the L2TPHC IP protocol id. The UDP header is omitted, and the L2TPHC header is reduced to 1 byte. The added
description: Length Extension (LXT) is a one-bit field in the PPP Multiplexed Frame Option Over HDLC that indicates whether the length field is one byte or two bytes long. It determines the size of the sub-frame length field, which can be either 6 bits or 14 bits, depending on the value of LXT.
explanation: LXT is classified as a Parameter because it is a configuration setting used in the PPP Multiplexed Frame Option Over HDLC to determine the length of the sub-frame. The context highlights its role in specifying the size of the length field, which affects how the sub-frame length is interpreted.
section_title: 6.2.3.1	PPP Multiplexed Frame Option Over HDLC
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