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Routed packets are transported across a PPP/MLPPP link using IP Control Protocol
(IPCP), described in RFC 1332. This is the encapsulation that is familiar to most users of
PPP. The routed packets do not contain Ethernet headers so cannot preserve VLAN
tags. However, the WAN ports still must be added as tagged ports to the VLAN that
contains them. The module uses the tags internally and strips them off before the
packets are transmitted. The IP addresses used for the PPP/MLPPP link are taken from
the IP address assigned to the VLAN at each end of the link. The VLAN that contains
the IPCP encapsulated PPP/MLPPP ports cannot contain other ports. In other words,
the only ports allowed in the VLAN are those that make up the IPCP encapsulated
link.There can only be one VLAN spanning an IPCP-encapsulated link.
You must have one and only one encapsulation type configured on a PPP/MLPPP link.
Setting BCP encapsulation off implies that IPCP encapsulation is on. The default setting
is BCP encapsulation on and IPCP encapsulation off. To configure encapsulation, use
the following command:
config ppp [bcp [on | off] | ipcp [on | off]] [ports <portlist> |
multilink <groupname>]
PPP/MLPPP Configuration Commands
Table 3-1 describes the commands used to configure a PPP/MLPPP link.
Table 3-1: PPP/MLPPP Configuration Commands
Command
config multilink <groupname> add ports
<portlist>
config multilink <groupname> delete ports
<portlist>
config ppp authentication [off | chap | pap |
chap-pap]
[ports <portlist> | multilink <groupname>]
config ppp [bcp [on | off] | [ipcp [on | off]] [ports
<portlist> | multilink <groupname>]
config ppp user <username> {encrypted}
<password>
[ports <portlist> | multilink <groupname>]
WAN Module Installation and User Guide
Description
Adds ports to a multilink group.
Removes ports from a multilink group.
Sets the authentication method for a PPP link
or a MLPPP multilink group. The default setting
is to use no authentication.
Sets the encapsulation method for a
PPP/MLPPP link. You cannot set both to on, or
both to off. Configuring bcp on implies ipcp off;
configuring ipcp on implies bcp off. The default
setting is bcp on.
Sets the username sent to the remote end of a
PPP/MLPPP link for authentication.
Configuring a PPP/MLPPP Link
3-5
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