3Com Router User Manual

MP Overview167
Figure 49   Diagram of PPP negotiation phases
For detailed description of PPP, refer to RFC1661.
MP OverviewMP protocol (PPP Multilink protocol) can bind multiple PPP links, so as to increase 
bandwidth. MP protocol can fragment large packets, and then the fragmentation 
will be sent to the same destination through different PPP links, so as to decrease 
the transmission time of large packets.
The negotiation process in MP mode is as follows (e.g: establishing MP in the 
virtual interface...

168CHAPTER 12: CONFIGURING PPP AND MP
Ta b l e 194   Configure the link layer protocol of the interface to PPP
The default link layer protocol of the interface is PPP.
2Configure PPP Authentication
PPP has two authentication modes: PAP mode and CHAP mode. CHAP 
authentication is more secure.
■Configure PAP authentication
aConfigure the authenticator of PAP authentication
Perform the following configuration in the interface view, and use the user 
command in 
the system view.
Ta b l e 195   Configure the...

Configure PPP169
Ta b l e 197   Configure the local authenticates the peer in CHAP mode
bConfigure the requester of CHAP authentication
Perform the following configuration in the interface view, and use the 
local-user command in the system view.
Ta b l e 198   Configure as the peer authenticates the local in CHAP mode
Generally, when the router configures user list, it configures the command ppp 
chap user username
 and local-user user password { simple | cipher } 
password
, to perform CHAP...

170CHAPTER 12: CONFIGURING PPP AND MP
Whether the PPP user passes the authentication will be finally decided by AAA, 
which can authenticate PPP user at local or at RADIUS server.
Local authentication is to authenticate the local user configured through the 
local-user user password { simple | cipher } password command, and 
RADIUS server authentication is to authenticate using the user database on 
RADIUS server. The specific configuration commands are shown in the following 
table.
Ta b l e 199...

Configure MP171
In MP working mode, it is not recommended to use PPP compression. To configure 
PPP compression negotiation on the virtual interface, PPP compression must be 
configured on Virtual-template interface before the subordinate physical interface 
can accept the PPP compression negotiation.
6Configure PPP Link Quality Monitoring
PPP link quality monitoring can be a real time monitoring the PPP link quality 
(including PPP links bound to MP). When link quality is lower than the Disabled...

172CHAPTER 12: CONFIGURING PPP AND MP
■Configure MP Protocol Parameters
1Create Virtual Template
Ta b l e 203   Create/Delete virtual template
2Configure Operating Parameters of Virtual Template
Comparing virtual template interface with general physical interface, users can 
find that the link layer protocol supports only PPP and the network protocol 
supports IP and IPX. Therefore the following operating parameters can be set:
■Set operating parameters of PPP
■Set IP address of virtual interface
■Set IP...

Configure MP173
■Bind according to username or endpoint
Here the username refers to the received remote username when PPP link 
performs PAP or CHAP authentication. Endpoint is the unique mark of a router 
and refers to the received remote endpoint when performing LCP negotiation. 
The system can implement MP binding according to the received username or 
endpoint and bind the interfaces that have the same username or endpoint to 
the same virtual template interface.
aSpecify the conditions for MP...

174CHAPTER 12: CONFIGURING PPP AND MP
By default, the maximum link number of links that MP channel permits to bind 
is 16.
bConfigure the maximum number of fragments received by MP channel
Ta b l e 209   Configure the maximum number of fragments received by MP channel
By default, the maximum number of fragments that MP channel permits to 
receive is 4.
cConfigure the maximum number of fragments that MP channel permits to 
send
Ta b l e 210   Configure the maximum number of fragments that MP channel...

Display and Debug PPP175
By default, virtual Baud rate is not set on interface. 
Display and Debug 
PPPPlease use the display and debugging commands in all views.
Ta b l e 212   Display and debug PPP
Typical PPP 
Configuration 
Example
PAP Authentication 
ExampleI. Configuration Requirement
As shown in Figure 50, Router1 and Router2 are interconnected through interface 
Serial0, and router Router1 (authenticator) is required to authenticate router 
Router2 (requester) in PAP mode.
II. Networking Diagram...

176CHAPTER 12: CONFIGURING PPP AND MP
II. Configuration Procedure
1Configure Router1:
aAdd a user with name Router2 and password hello to the local database
[Router]local-user Router2 password simple hello
bSet local username as Router1
[Router]interface serial 0
[Router-Serial0]ppp chap user Router1
cConfigure to start CHAP authentication at this side
[Router-Serial0]ppp authentication-mode chap
2Configure router Router2:
aAdd a user with name Router1 and password hello to the local database...