Command:

network backdoor


Mode:

Router(config-router)#

Router(config-router-af)#


Syntax:

network ip-address backdoor
no network ip-address backdoor

 

Syntax Description:

ip-address IP address of the network to which you want a backdoor route.

 

Command Description:

To specify a backdoor route to a BGP-learned prefix that provides better information about the network, use the network backdoor command in address family or router configuration mode. To remove an address from the list, use the no form of this command.

No network is marked as having a back door by default.

A backdoor network is assigned an administrative distance of 200. The objective is to make Interior Gateway Protocol (IGP) learned routes preferred. A back door network is treated as a local network, except that it is not advertised. A network that is marked as a backdoor is not sourced by the local router, but should be learned from external neighbors. The BGP best path selection algorithm does not change when a network is configured as a back door.


Example:

The following address family configuration example configures network 10.108.0.0 as a local network and network 192.168.7.0 as a backdoor network:

Router(config)#router bgp 109
Router(config-router)#address-family ipv4 multicast
Router(config-router-af)#network 10.108.0.0
 Router(config-router-af)#network 192.168.7.0 backdoor

The following router configuration example configures network 10.108.0.0 as a local network and network 192.168.7.0 as a backdoor network:

Router(config)#router bgp 109
Router(config-router)#network 10.108.0.0
Router(config-router)#network 192.168.7.0 backdoor


Misconceptions:

None


Related Commands:

address-family ipv4
distance bgp
router bgp

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