BGP Default Route Advertisement | 3 Ways to Advertise a Default Route Into BGP on a Cisco Router

BGP Default Route Advertisement | 3 Ways to Advertise a Default Route Into BGP on a Cisco Router



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Confused as to how to redistribute a default route into BGP? I know, in most IGPs this is accomplished with “default-information originate”, however BGP is a little different. This video will show you the 3 different ways to advertise a default route into BGP on a Cisco router and the difference between each of them.

I also wanted to make note of the fact that when I mentioned that “default-information originate” must be added in addition to “redistribute static”, this also applies to situations where the default route is carried by another routing protocol, such as ospf. In a case such as this, you would need to “redistribute ospf”, and also issue the “default-information originate” command. The default route used in the video was a static, so this was definitely an oversight.



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Quick Notes

network 0.0.0.0
Conditions – Default route exists in routing table

default-information originate
Conditions – Default route exists in routing table + Redistribute static (or whatever else is carrying the default route. i.e. OSPF)

neighbor x.x.x.x default-originate
Conditions – Originates default route unconditionally

 

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