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T1/E1 WAN Configuration Guide Configuring Layer 2 Protocols (Frame Relay, PPP, HDLC)

The following commands specify the configuration parameters required for a standard multilink frame

relay interface:

>enable

#config terminal

(config)#interface fr 1

(config-fr 1)#frame-relay multilink

(config-fr 1)#no shutdown

(config-fr 1)#exit

Now, cross connect multiple physical interfaces to the same multilink frame-relay interface:

(config)#cross-connect 1 t1 3/1 1 fr 1

(config)#cross-connect 2 t1 3/2 2 fr 1

(config)#cross-connect 3 t1 3/3 3 fr 1

Configuring PPP Interfaces

There are two settings to consider when configuring PPP interfaces: the IP address and the maximum

transmission unit (MTU). There are no default IP addresses, so each interface must be manually

programmed with the appropriate address (ip address). All NetVanta PPP interfaces have a default MTU

of 1500 bytes, which works for most applications.

The following commands specify the configuration parameters required for a standard PPP interface:

>enable

#config terminal

(config)#interface ppp 1

(config-ppp 1)#ip address 68.22.15.2 /30

(config-ppp 1)#no shutdown

(config-ppp 1)#exit

Multilink PPP Operation

Multilink PPP operation increases bandwidth on your PPP connection by aggregating multiple

physical links into a single logical bundle. All the physical links in a multilink bundle are treated as a

single entity by the system, allowing each PPP session on the connection to dynamically share the total

bandwidth of the bundle. Single data packets can be fragmented into smaller pieces which may or may

not be transmitted to the network over the same physical link. Multilink PPP devices balance the

transmitted information to evenly use all the physical links in a bundle.

The multilink bundle will remain active with a minimum of one physical link. Physical links can be

dynamically added and removed from the logical bundle with a minor interruption to data flow, so a

failure on one physical link does not halt the overall operation of the bundle. Since all PPP sessions

have access to the entire bundle bandwidth, failure of a single physical connection in the bundle does

not decrease efficiency.

Remote side PPP peers are virtually unaffected by multilink operation; however, they must be aware

that multilink PPP operation is occurring and be able to handle the fragmented frames transmitted on

multiple physical links. Each PPP fragmented frame will include a sequence number to aid in the

reconstruction of PPP frames.

Multilink PPP requires minimal configuration in your AOS product. You must first enable multilink

operation on the PPP interface and then cross-connect the multiple physical interfaces to the single

PPP interface.

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