ZyXEL Communications 642R Series manual Encapsulation and Multiplexing Scenarios

Prestige 642R Series ADSL Router

4.1.2 Encapsulation and Multiplexing Scenarios

For Internet access you should use the encapsulation and multiplexing methods used by your ISP. For LAN-to-LAN applications, e.g., branch office and corporate headquarters, prior mutual agreement on methods used is necessary because there is no mechanism to automatically determine encapsulation or multiplexing. Selection of which encapsulation and multiplexing methods to use depends on how many VCs you have and how many different network protocols you need. The extra overhead that PPP over Ethernet (PPPoE) and ENET ENCAP encapsulation entail makes them a poor choice in a LAN-to-LAN application. Here are some examples of more suitable combinations in such an application.

Scenario 1. One VC, Multiple Protocols

PPP(RFC-2364) encapsulation with VC-basedmultiplexing is the best combination because the extra protocol identifying headers that LLC-basedmultiplexing uses is not needed. The PPP protocol already contains this information.

Scenario 2. One VC, One Protocol (IP)

Select RFC-1483encapsulation with VC-basedmultiplexing requires the least amount of overhead (0 octets). However, if there is a potential need for multiple protocol support in the future, it may be safer to select PPP encapsulation instead of RFC-1483, so you do not need to reconfigure either machine when the time comes.

Scenario 3. Multiple VCs

If you have an equal number (or more) of VCs than the number of protocols, then select RFC-1483encapsulation and VC-basedmultiplexing.

When Menu 11.1 – Remote Node Profile appears fill in the fields as described in the following table to define this remote profile. The Remote Node Profile Menu Fields table shows you how to configure the Remote Node Menu.

4-2 Remote Node Configuration