Specifications

Chapter 1. Router Concepts 27
0x0021 IP
0x002d Van Jacobson compressed TCP/IP
0x002f Van Jacobson uncompressed TCP/IP
0x8031 Bridge NCP
0x0031 Bridge Frame
The command for this encapsulation option is: remote setProtocol PPP <remoteName>
See page 284.
Note: With PPP over ATM, the address and control fields (i.e., FF03) are never present; this also is the case for
LCP packets.
PPPLLC
This protocol (LLC-multiplexed) allows PPP traffic to be carried simultaneously with other traffic on a single
virtual circuit (as opposed to the PPP method of encapsulationÑVC multiplexingÑwhich dedicates a virtual
circuit to PPP traffic only).
Each PPP packet is prepended with the sequence 0xFEFE03CF. Thus, an LLC packet has the format:
0xFEFE03CF 0xC021.
The command for this encapsulation option is: remote setProtocol PPPLLC <remoteName>
See page 284.
RFC 1483 or RFC 1490
Bridging
User data packets are prepended by the sequence 0xAAAA0300 0x80c20007 0x0000 followed by the
Ethernet frame containing the packet.
802.1D Spanning Tree packets are prepended with the header 0xAAAA0300 0x80C2000E.
Routing
IP packets are prepended with the header 0xAAAA0300 0x00000800.
IPX packets are prepended with the header 0xAAAA0300 0x00008137.
The commands for this encapsulation option are:
remote setProtocol RFC1483 <remoteName> (for ATM)
remote setProtocol FR <remoteName> (for Frame Relay - RFC 1490)
See page 284.