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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

spanning-tree backbonefast — global

Synopsis

spanning-tree backbonefast
no spanning-tree backbonefast

Configures

BackboneFast feature

Default

Disabled

Description

The command enables the BackboneFast feature, which should be enabled on all routers that contain an Ethernet switch network module. BackboneFast provides quicker convergence on the network backbone after a spanning-tree topology change by enabling the switch to detect an indirect link failure and to start the spanning-tree calculation faster than the normal spanning-tree rules would allow.

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