Refer to the Exhibit.
You are deploying a Virtual Chassis consisting of four EX4200s. You have powered on all four switches at the same time with the settings shown in the exhibit.
Which Virtual Chassis member will become the master?
A.
Switch-1
B.
Switch-2
C.
Switch-3
D.
Switch-4
Explanation:
For resiliency and redundancy, the Virtual Chassis configuration includes a master and a backup switch, both dynamically elected as part of the Virtual Chassis configuration. Each remaining switch serves as a line card switch but is ready to be selected as a backup switch if the master or backup switch fails. Switches may also be selectively prioritized in a Virtual Chassis configuration to assign master and backup roles, and to determine the order in which the remaining switches are elected if the master and backup switches fail.Master Role
The member switch that operates in the master role in a Virtual Chassis configuration has full control over the Virtual
Chassis configuration. It performs the following functions:* Serves as the active Routing Engine for the Virtual Chassis configuration.
* Manages the member switches in the Virtual Chassis configuration.
* Runs Junos OS for the Virtual Chassis configuration.
* Runs the chassis management processes and network control protocols.
* Calculates and maintains the forwarding table and distributes it to the local CPU, and then to Packet Forwarding Engines (PFEs) in all member switches.
* Receives and transmits routing information.
* Represents all member switches (the hostname and other properties that are assigned to the master switch during setup apply to all members of the Virtual Chassis configuration).
* Holds the active and master copy of the entire Virtual Chassis configuration. Copies of the active configuration can also be synchronized to all member switches by using the commit sync command-line interface (CLI) command.Mastership Election Process
When a Virtual Chassis configuration boots, the Junos OS for EX Series switches automatically runs the mastership election process to determine which member switches take the role of master, backup, and line cards. All Virtual Chassis member switches participate in the election process. If a master switch fails, the backup switch automatically and immediately takes on the master role, which minimizes interruption to the operation of Virtual Chassis configuration. The system subsequently runs the mastership election process to elect one of the line card switches as the new backup switch. (The system also runs this process if the backup switch fails.)The election algorithm follows the sequence below to assign member roles and elect a master and a backup switch. The master role is assigned to the switch with the highest ranking. The backup role is assigned to the switch with the second highest ranking. Other switches become line cards.
1. Choose the member with the highest user-configured mastership priority. (One is the lowest and 255 is the highest possible value; please see the Mastership Priority Setting section for more information.)
2. Choose the member that was the master switch the last time the Virtual Chassis configuration booted.
3. In a Virtual Chassis configuration merge scenario, choose the (master) member that has the highest number of current members in the existing Virtual Chassis configuration. (A merge scenario occurs when two active Virtual Chassis configurations, each with its own master, are combined.)
4. Choose the member that has been included in the Virtual Chassis configuration for the longest time. (For this factor to be considered, there must be a lapse of at least one minute between the power-on of each interconnected member switch.)
5. Choose the member with the lowest Media Access Control (MAC) address.Refer to http://www.juniper.net/us/en/local/pdf/implementation-guides/8010018-en.pdf