Difference between are created by default and 0.0.0.0 network in BGP

Hello

Please I need someone to clarify what is the difference between the command "come from default" and "network 0.0.0.0 - ip route 0.0.0.0 0.0.0.0 null0" commands. I see both serve the same purpose by a default route to a counterpart of the advertising, but at the same time, I feel a difference on them.

THX

Kind regards

B....

Dear friends,

Lingam summarizes the options to inject the default route in BGP very well. Thank you!

In addition, let me point out a few differences between these approaches.

The default information is created, redistribution from a different source and the network 0.0.0.0 are all similar in the resulting effect: they will inject the default route in BGP RIBS and it will be announced to all the BGP neighbors. The difference is originally from the default route that is injected into BGP:

  • default information is created causes the default route generated artificially and injected in the BGP RIB, launch to know if it is present in the routing table.
  • Redistribution and 0.0.0.0 network will inject the default route in BGP only if the default route is currently present in the routing table, and in addition in the case of redistribution, if learned by a specific protocol source we're redistribution of.

The nearby X.X.X.X are created by default is different in that the default route is announced only this specific BGP neighbor and not to all the existing BGP neighbors as with previous approaches. The default route will not present in the BGP RIBS of the router that is configured with the command nearby X.X.X.X are created by default and so it will not usually be announced to all the BGP neighbors. At the same time, this command is similar to the default information are created in that the default route is generated artificially and didn't need to be present in the routing table.

Lingam, let me correct a small inaccuracy: you wrote:

The "network 0.0.0.0" command enables the router to advertise the default route because the router thinks that 0.0.0.0 is directly connected via Null0.

In regards to the PMO, the network command does not seek for networks connected directly (as opposed to IGP protocols) but for the networks present in the routing table. They do not need to be directly connected. Properly, the statement should say:

The command 'network 0.0.0.0' active router advertise the default route because the router has the 0.0.0.0/0 road shows in its routing table.

Best regards

Peter

Tags: Cisco Network

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