RFC 2341 (rfc2341) - Page 2 of 29
Cisco Layer Two Forwarding (Protocol) "L2F"
Alternative Format: Original Text Document
RFC 2341 Cisco L2F May 1998
4.1.2 Encapsulation of SLIP within L2F 10
4.2 L2F Packet Format 10
4.2.1 Overall Packet Format 10
4.2.2 Packet Header 11
4.2.3 Version field 11
4.2.4 Protocol field 11
4.2.5 Sequence Number 12
4.2.6 Packet Multiplex ID 12
4.2.7 Client ID 13
4.2.8 Length 13
4.2.9 Packet Checksum 13
4.2.10 Payload Offset 14
4.2.11 Packet Key 14
4.2.12 Packet priority 14
4.3 L2F Tunnel Establishment 14
4.3.1 Normal Tunnel Negotiation Sequence 15
4.3.2 Normal Client Negotiation Sequence 17
4.4 L2F management message types 18
4.4.1 L2F message type: Invalid 18
4.4.2 L2F_CONF 19
4.4.3 L2F_OPEN, tunnel establishment 20
4.4.4 L2F_OPEN, client establishment 20
4.4.5 L2F_CLOSE 22
4.4.6 L2F_ECHO 22
4.4.7 L2F_ECHO_RESP 23
4.5 L2F Message Delivery 23
4.5.1 Sequenced Delivery 23
4.5.2 Flow Control 23
4.5.3 Tunnel State Table 24
4.5.4 Client State Table 25
5.0 Protocol Considerations 26
5.1 PPP Features 26
5.2 Termination 26
5.3 Extended Authentication 26
5.4 MNP4 and Apple Remote Access Protocol 27
5.5 Operation over IP/UDP 27
6.0 Acknowledgments 27
7.0 References 27
8.0 Security Considerations 28
9.0 Authors' Addresses 28
10.0 Full Copyright Statement 29
Valencia, et. al. Historic
