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Cisco® BGP-4 Command and Configuration Handbook (CCIE Professional Development) by William R. Parkhurst Ph.D.

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9-4. network ip-address mask network-mask backdoor

Syntax Description:

  • ip-address— Network to advertise to BGP peers.

  • network-mask— Optional parameter used to advertise nonclassful network prefixes.

Defaults: None

Limitations: Up to 200 instances of the network command may be used in the configuration. For Cisco IOS Software Release 12.0 and later, this restriction has been removed.

Purpose: When a router is running more than one IP routing protocol, the possibility exists that a particular route might be learned by two or more protocols. Because different IP routing protocols calculate the cost to a route using different metrics, the protocol cost cannot be used to select the best path. When a route is known by more than one IP routing protocol, ...

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