19 Mar

Default routes in BGP

There are 3 ways of advertising default route in BGP.

Method 1: Using network command.
It requires only that the route is present in the Interior Gateway Protocol (IGP) routing table. This is the preferred approach.

Method 2: Using default-information originate command.
It requires explicit redistribution of the route This protects against someone accidentally redistributing a default route in BGP which could potentially be disastrous.

Method 3: Using neighbor default-originate command.
This method does not require the presence of the network in the routing table of the advertising router.



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