Which three statements about BGP soft reconfiguration are true?
A. Outbound soft reconfiguration stores an additional copy of the routes advertised to a neighbor before routing policies take effect.
B. Inbound soft reconfiguration stores an additional copy of the routes received from a neighbor before routing policies take effect.
C. Outbound soft reconfiguration requires additional configuration on the BGP neighbor.
D. Inbound soft reconfiguration requires additional configuration on the BGP neighbor.
E. Outbound soft reconfiguration requires additional memory.
F. Inbound soft reconfiguration requires additional memory.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/15-mt/irg-15-mt-book/irg-soft-config.html
Original answers are correct – B,D,F
B – “All the updates received from this neighbor will be stored unmodified, regardless of the inbound policy. When inbound soft reconfiguration is done later, the stored information will be used to generate a new set of inbound updates.”
D – “Route refresh must first be advertised through BGP capability negotiation between peers. All BGP devices must support the route refresh capability.”
F – “Note that the memory requirements for storing the inbound update information can become quite large.”
D is correct, i had to think about it for some minutes,
Compared to soft reconfiguration outbound, the Soft Reconfiguration inbound needs an extra configuration for each neighbor where you need it. Correct answer would be: Inbound soft reconfiguration requires additional configuration for the BGP neighbor.
All statements about outbound Soft reconfiguration are wrong!
Sorry, D is wrong because there is no additional configuration on the neighbor, only on the local router.
How about to think additional configuration on the BPP neighbor “line” on the configuration of the router?
…. Nonsense question.
Should be A, B, F
D is wrong because there is no ‘additional’ configuration’ just one line
This question is a nightmare. At the same time that both A and B seem to be correct, if they are, then E and F are correct as well (because if ADDITIONAL copies are stored, then ADDITIONAL memory is needed). Hence the question doesn’t resolve, because we can only mark 3 options.
On the other hand, if either A or B are not correct (which immediately makes its counterpart E or F to be incorrect as well), then C or D must be correct and looking at them, both seem to be wrong.
So basically, this question does not have an answer… congratulations, Cisco!