Encapsulation And Multiplexing Scenarios; Figure 13-1 Menu 11 Remote Node Setup - ZyXEL Communications Prestige 645R-A Series User Manual

Prestige 645R-A Series User's Guide

13.2.2 Encapsulation and Multiplexing Scenarios

For Internet access you should use the encapsulation and multiplexing methods used by your ISP. Consult
your ISP for information on encapsulation and multiplexing methods for LAN-to-LAN applications, for
example between a branch office and corporate headquarters. There must be prior agreement on
encapsulation and multiplexing methods because they cannot be automatically determined. What method(s)
you use also depends on how many VCs you have and how many different network protocols you need.
The extra overhead that ENET ENCAP encapsulation entails makes it 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
PPPoA (RFC-2364) encapsulation with VC-based multiplexing is the best combination because no extra
protocol identifying headers are needed. The PPP protocol already contains this information.
Scenario 2. One VC, One Protocol (IP)
Selecting RFC-1483 encapsulation with VC-based multiplexing 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 PPPoA encapsulation instead of RFC-1483, so you do not need to reconfigure either computer later.
Scenario 3. Multiple VCs
If you have an equal number (or more) of VCs than the number of protocols, then select RFC-1483
encapsulation and VC-based multiplexing.
13-2
Menu 11 - Remote Node Setup
1. My ISP (ISP, NAT)
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Enter Node # to Edit:

Figure 13-1 Menu 11 Remote Node Setup

Remote Node Configuration