Which statement is true about default BGP route redistribution behavior?

Which statement is true about default BGP route redistribution behavior?

Which statement is true about default BGP route redistribution behavior?

A.
IBGP-learned routes are advertised only to other IBGP peers.

B.
EBGP-learned routes are redistributed into any IGPs.

C.
EBGP-learned routes are advertised only to other EBGP peers.

D.
EBGP-learned routes are advertised to other IBGP and EBGP peers.



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Edu

Edu

For me it is not correct.

EBGP-learned routes are not redistributed by default to any IGP cause IGP can not handle all BGP routes.

The correct is: EBGP-learned routes are advertised to other IBGP and EBGP peers.

Anyone disagree?

mike

mike

D is correct

Rico

Rico

Hi, What do you think about synchronization between BGP and IGPs? It is enabled by default. So I think the B could be true.

mike

mike

Can not be. No default synchronization. That is nonsense.
The only way how to import routes from other routing protocols in to any other routing protocols are explicit routing policies.
And don’t forget, that if one side is pushing routes to a routing protocol, the other side (peer, neighbor) can deny them or control which routes it will accept and which not.

steve

steve

It is not clear if they mean the “BGP default advertisement rules”.

Or they mean i.e. redistribution (Cisco term ?) OSPF routes => into BGP. (or vice versa)

Strange question.

It is a little bit odd to “default redistribute” a full internet routing tabel in to your IGP 🙂 Maybe RIP is a good solution 🙂

So I think also D is the best.

Fred Kang

Fred Kang

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