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

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

sub-interfaces

(config)#interface fr 1.16

(config-fr 1.16)#frame-relay interface-dlci 16

(config-fr 1.16)#frame-relay bc 768000

(config-fr 1.16)#frame-relay be 768000

(config-fr 1.16)#ip address 192.168.72.1 /30

(config-fr 1.16)#no shutdown

(config-fr 1.16)#exit

Multilink Frame Relay Operation

Multilink frame relay operation increases bandwidth on your frame relay service 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 PVC 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 frame relay devices

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

AOS products support multilink frame relay (FRF.16), requiring that the multilink operation be

supported from the network provider. Remote side frame relay connections are unaffected by multilink

operation; the multilink FRF.16 functionality provides an effective way to increase the total bandwidth

at a single site between the frame relay device and the network provider.

Physical links can be dynamically added and removed from the logical bundle, so a failure on one

physical link does not halt the overall operation of the bundle. Since all PVCs have access to the entire

bundle bandwidth, failure of a single physical connection in the bundle does not decrease efficiency.

Multilink frame relay requires minimal configuration in your AOS product. You must first enable

multilink operation on the frame relay interface (not sub-interface) and then cross-connect the multiple

physical interfaces to the single frame relay interface. Optionally, you can set a bundle ID (label for the

bundle), but the AOS will automatically define one based on the specified frame relay interface. For

example, if multilink operation is enabled on a frame relay interface labeled fr 1, the bundle ID

becomes mfr1 (with the 1 corresponding to the label of the frame relay interface). Bundle IDs can be

character strings containing 1 to 48 characters. Manually defining the bundle ID can make it easier to

differentiate between bundles in systems with more than one multilink bundle. In systems with a single

multilink bundle, leaving the bundle ID to the default value is the easiest solution.

Labeling the frame relay sub-interfaces using the DLCI (such as 1.16 indicating a DLCI of

16) is useful for quickly determining (from a configuration printout) which sub-interface

corresponds to which PVC.

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ADTRAN E1 Manual de usuario Pagina 6