JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing — Question 15

-- Exhibit --
{master}[edit]
user@router-RE0# run show task replication

Stateful Replication: Enabled -

RE modE. Master -
Protocol Synchronization Status
OSPF Complete
RIP Complete
BGP Complete
MPLS Complete
LDP Complete
{master}[edit]
user@router-RE0# run show bgp summary | find 192.168.1.1
192.168.1.1 65056 0 0 11:14 Establ inet.0: 0/0/0/0 inet.2: 0/0/0/0 bgp.l3vpn.0: 0/0/0/0
...
{backup}[edit]
user@router-RE1# run show system switchover

Graceful switchover: On -

Configuration databasE. Ready -

Kernel databasE. Synchronizing -

Peer statE. Steady State -
{backup}[edit]
user@router-RE1# run show bgp summary | find 192.168.1.1
192.168.1.1 65056 306 581 0 7 7 Idle
-- Exhibit --
Click the Exhibit button.
You have been asked to determine if an NSR switchover will be hitless for a given BGP peer.
Referring to the exhibit, which statement is true?

Answer options

• A. The BGP session is idle on the backup RE indicating that the session will flap at switchover.
• B. The task replication process has completed on the master indicating a hitless switchover can be expected.
• C. The GRES synchronization process is underway and must complete before the protocol state can be checked.
• D. The BGP session is idle on the backup RE which is normal; it toggles to established at mastership change.

Correct answer: A

Explanation

The correct answer is A because the BGP session is indeed idle on the backup RE, which means it is not established and will flap when a switchover occurs. Option B is incorrect as task replication completion does not guarantee a hitless switchover if the BGP session is idle. Option C is misleading; while GRES synchronization is important, it does not directly relate to the status of the BGP session. Option D incorrectly suggests that the idle state is normal and that it will automatically establish, which is not the case.