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WAN Module Installation and User Guide 3-5
Configuring a PPP/MLPPP Link
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 Description
config multilink <groupname> add ports
<portlist>
Adds ports to a multilink group.
config multilink <groupname> delete ports
<portlist>
Removes ports from a multilink group.
config ppp authentication [off | chap | pap |
chap-pap]
[ports <portlist> | multilink <groupname>]
Sets the authentication method for a PPP link
or a MLPPP multilink group. The default setting
is to use no authentication.
config ppp [bcp [on | off] | [ipcp [on | off]] [ports
<portlist> | multilink <groupname>]
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.
config ppp user <username> {encrypted}
<password>
[ports <portlist> | multilink <groupname>]
Sets the username sent to the remote end of a
PPP/MLPPP link for authentication.
- WAN Module Installation 1
- Contents 3
- 3 Configuring PPP and MLPPP 4
- Index of Commands 4
- Introduction 5
- Conventions 6
- Convention Description 7
- Related Publications 8
- Installing the WAN Module 10
- Ports and Connectors 11
- Module LEDs 12
- Table 1-1: WAN Module LEDs 13
- Configuring the WAN Physical 17
- Red, Blue, and Yellow Alarms 18
- Cable length 19
- Facility Data Link 20
- Clock Source 20
- Inband Loopback Detection 21
- Linecoding 21
- Receiver Gain 21
- SNMP Alerts 21
- Timeslots 22
- Yellow Alarms 22
- Monitoring WAN Physical Links 24
- Remote WAN PortLocal WAN Port 25
- Enabling Loopback Mode 28
- Disabling Loopback Mode 28
- WAN Port Monitoring Commands 29
- Configuring PPP and MLPPP 31
- Configuring a PPP/MLPPP Link 33
- Encapsulation 34
- Monitoring PPP/MLPPP Links 36
- command 37
- Switch #1 38
- Safety Information 41
- FCC Certification 42
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