Thursday 6 September 2012
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The following example enables PPP encapsulation on serial interface 0/0/0:
To configure compression over PPP, enter the following commands:
If the link quality percentage is not maintained, the link is deemed to be of poor quality and is taken down. Link Quality Monitoring (LQM) implements a time lag so that the link does not bounce up and down.
Use the configuration commands below to monitor the data traffic on the link and avoids frame looping:
4:How to Configure Load Balancing Across Links (MultiLinks)
Multilink PPP (also referred to as MP, MPPP, MLP, or Multilink) provides a method for spreading traffic across multiple physical WAN links while providing packet fragmentation and reassembly, proper sequencing, multivendor interoperability, and load balancing on inbound and outbound traffic.
MPPP allows packets to be fragmented and sends these fragments simultaneously over multiple point-to-point links to the same remote address. The multiple physical links come up in response to a user-defined load threshold. MPPP can measure the load on just traffic into the network, or on just traffic going out, but not on the combined load of both inbound and outbound traffic.
Use the following commands to perform load balancing across multiple links:
How to configure PPP on Cisco Router
How to configure PPP on Cisco Router
You can configure point-to-point encapsulation, software compression, link quality monitoring, load balancing across links (multilinks) on R1, R2 and R3 serial interface below.
Before you actually configure PPP
on a serial interface, we will look at the commands and the syntax of
these commands as shown below. This series of examples shows you how to
configure PPP and some of the options.
1: How to enable PPP on an Interface
To set PPP as the encapsulation method used by a serial or ISDN interface, use the encapsulation ppp interface configuration command. The following example enables PPP encapsulation on serial interface 0/0/0:
The encapsulation ppp command has no arguments, however, you must first configure the router with an IP routing protocol (RIP, EIGRP or OSPF) to use PPP encapsulation. You should recall that if you do not configure PPP on a Cisco router, the default encapsulation for serial interfaces is HLDC.R1#config tR1(config)#interface se 0/0/0R1(config-if)#encapsulation pppR1(config-if)#end
2: How to configure Compression
You can configure point-to-point
software compression on serial interfaces after you have enabled PPP
encapsulation. Because this option invokes a software compression
process, it can affect system performance. If the traffic already
consists of compressed files (.zip, .tar, or .mpeg, for example), do not
use this option. To configure compression over PPP, enter the following commands:
3: How to configure Link Quality MonitoringR1(config)#interface serial 0/0/0R1(config-if)#encapsulation pppR1(config-if)#compress [predictor | stac]R1(config-if)#end
One of the primary functions of LCP
when establishing a PPP session includes testing of a link to determine
whether the link quality is sufficient to use Layer 3 protocols. The
command ppp quality {percentage} ensures that the link meets the quality requirement you set; otherwise, the link closes down.
How Link Percentage is calculated
The percentages are calculated for both incoming and outgoing directions. The outgoing quality is calculated by comparing the total number of packets and bytes sent to the total number of packets and bytes received by the destination node. The incoming quality is calculated by comparing the total number of packets and bytes received to the total number of packets and bytes sent by the destination node.If the link quality percentage is not maintained, the link is deemed to be of poor quality and is taken down. Link Quality Monitoring (LQM) implements a time lag so that the link does not bounce up and down.
Use the configuration commands below to monitor the data traffic on the link and avoids frame looping:
R1(config)#interface serial 0/0/0R1(config-if)#encapsulation pppR1(config-if)#ppp quality 80R1(config-if)#end
Use the no ppp quality command to disable LQM.
Multilink PPP (also referred to as MP, MPPP, MLP, or Multilink) provides a method for spreading traffic across multiple physical WAN links while providing packet fragmentation and reassembly, proper sequencing, multivendor interoperability, and load balancing on inbound and outbound traffic.
MPPP allows packets to be fragmented and sends these fragments simultaneously over multiple point-to-point links to the same remote address. The multiple physical links come up in response to a user-defined load threshold. MPPP can measure the load on just traffic into the network, or on just traffic going out, but not on the combined load of both inbound and outbound traffic.
Use the following commands to perform load balancing across multiple links:
The multilink command has no arguments. To disable PPP multilink, use the no ppp multilink commandR1#config tR1(config)#interface se0/0/0R1(config-if)#encapsulation pppR1(config-if)#ppp multilinkR1(config-if)#end
Configuring PPP with Authentication (PAP and CHAP)
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