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

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Name

neighbor version — router, BGP

Synopsis

neighbor {address | peer-group} version value
no neighbor {address | peer-group} version value

Configures

The BGP version to use for the neighbor

Default

Version 4

Description

This command lets you specify which BGP version to use when talking to the given neighbor (as specified by address or peer-group). The version number must be 2, 3, or 4. Although Version 4 is the default, the router should dynamically negotiate down to Version 2 if the neighbor doesn’t support Version 4.

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