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254 CHAPTER 17: CONFIGURING FRAME RELAY
By default, no Frame Relay switched PVC is created.
After configuring the Frame Relay switched PVC, the user will enter the frame
relay switch
view to perform the operations of shutdown and undo shutdown
on the switched PVC.
The differences between configuring a Frame Relay switched route and
configuring a Frame Relay switched PVC are listed below:
1) A Frame Relay switched route can become valid only when it is configured on
the two Frame Relay switched interfaces, whereas a Frame Relay switched PVC can
become valid as soon as it is configured in system view for once.
2) After the Frame Relay switched PVC is configured, the user will enter the frame
relay switch view. At this time, the user can perform the operations of
shutdown
and
undo shutdown on the switched PVC. However, the user cannot do that on a
Frame Relay switched route.
Configure Multilink
Frame Relay (FRF.16)
Overview
Multilink Frame Relay can bundle multiple low-rate Frame Relay links to form a
Frame Relay with high rate and wide bandwidth. Multilink Frame Relay creates a
virtual Frame Relay interface which contains multiple Frame Relay physical
interfaces. In this way, the bandwidth of the virtual Frame Relay is equal to the
sum of the bandwidth of each Frame Relay physical interface contained in the
virtual Frame Relay interface.
The virtual Frame Relay interface is called “Bundle”, and the physical interfaces
contained in the virtual interface is called “bundle link”. As for an actual physical
layer, bundle link is equal to an analog data link layer, and bundle manages all the
bundle links. As for data link layer, bundle is analog physical layer.
Figure 80 Illustration of the relationship between bundle and bundle links
On the Router Routers, the virtual Frame Relay interface is called “MFR interface”.
One MFR interface corresponds to one bundle, and one physical interface
corresponds to a bundle ink. The management performed on the bundle and
bundle link is actually the management to the MFR interface and the physical
interface.
After the Frame Relay physical interface is bundle to an MFR interface, the
network layer parameters and Frame Relay link layer parameters configured on it
Bundle Link
Physical Interface
Bundle Link
Physical Interface
Bundle
Frame Relay Protocol
Layer 3 Applications
Bundle Link
Physical Interface
Bundle Link
Physical Interface
Bundle
Frame Relay Protocol
Layer 3 Applications
Bundle
Bundle Link
Bundle Link