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Question 53

Refer to the exhibit. The R1 and R2 configurations are:

The neighbor relationship is not coming up.

Which two sets of configurations bring the neighbors up? (Choose two.)

A.

B.

C.

D.

E.

    Correct Answer:

    To establish a BGP neighbor relationship between R1 and R2 using their respective loopback addresses (10.1.1.1 and 10.1.1.2), you need to ensure that the routers can route packets to each other's loopback addresses and that the source of the BGP packets is the loopback interface. Additionally, BGP's check for direct connectivity has to be disabled since the loopbacks are not directly connected. The correct configurations are: 1) On R1: add a static route to R2's loopback, set the update-source to loopback 0, and disable the connected check. 2) On R2: add a static route to R1's loopback, set the update-source to loopback 0, and disable the connected check. These configurations ensure the proper packet routing and that the BGP session can establish. Therefore, the correct answers are D and E.

Discussion
drxz

De and E is correct ; The disable-connected-check was created precisely for the purpose of peering two directly connected routers on their loopbacks without using the ebgp-multihop https://ipwithease.com/using-disable-connected-check-in-cisco-bgp/

Carl1999

・About the operation of disable-connected-check When disable-connected-check is set, regardless of the referenced route Send the packet with TTL = 1. With disable-connected-check not set, The router that is trying to send a packet with TTL = 1 has the referenced route If it is "C" (direct connection), send a packet. "S" (Statec route) or "O" (OSPF) ,do not send packets.

examShark

The given answer is correct

Hack4

The given answer is correct

SeMo0o0o0

D & E are correct

vallzo

D & E are correct. If you configure TTL mulithop 2+ it would also work, and it implicit configures the disable connected check

conft

D and E is the correct.

inteldarvid

D and E anwser correct. I test in my lab. Its works

HungarianDish

Confirmed solution "D"+"E" in CML lab.

yonig

the only problem i have is that the loopbakc is not directly connected - you need another hop. but the ttl security command works the opposite from the multi-hop command. so the value should be 254 or multu hop 2. am i wrong ? unless you have reachabiity using IGP.

Huntkey

I didn't lab this but I think "ttl-security hops" have to be at least 2 for it to work. Therefore, the answer is correct.