- play_arrow Virtual Chassis Overview
- Virtual Chassis Overview for Switches
- Understanding EX Series Virtual Chassis
- Understanding QFX Series Virtual Chassis
- Understanding Virtual Chassis Components
- Understanding Mixed EX Series and QFX Series Virtual Chassis
- Understanding How the Primary in a Virtual Chassis Is Elected
- Understanding Global Management of a Virtual Chassis
- Understanding Virtual Chassis Port Link Aggregation
- Understanding Split and Merge in a Virtual Chassis
- Understanding Automatic Software Update on Virtual Chassis Member Switches
- Understanding MAC Address Assignment on a Virtual Chassis
- Understanding High Availability on an EX Series Virtual Chassis
- Understanding HiGig and HGoE Modes in a Virtual Chassis
- play_arrow Virtual Chassis Routine Monitoring and Troubleshooting
- Command Forwarding Usage with EX Series and QFX Series Virtual Chassis
- Verifying the Member ID, Role, and Neighbor Member Connections of a Virtual Chassis Member
- Verifying That Virtual Chassis Ports Are Operational
- Verifying That Graceful Routing Engine Switchover Is Working in the Virtual Chassis
- Troubleshooting an EX Series Virtual Chassis
- play_arrow Upgrading Software on a Virtual Chassis
- Understanding Software Upgrades in a Virtual Chassis
- Upgrading a QFX5100 Switch with a USB Device to Join a QFX5110 Virtual Chassis or Virtual Chassis Fabric
- Understanding Nonstop Software Upgrade on a Virtual Chassis and Mixed Virtual Chassis
- Configuring Line-Card Upgrade Groups for Nonstop Software Upgrade
- Upgrading Software on a Virtual Chassis and Mixed Virtual Chassis Using Nonstop Software Upgrade
- play_arrow Configuration Statements and Operational Commands
- play_arrow Knowledge Base
Configuring the Timer for the Backup Member to Start Using Its Own MAC Address as Primary of a Virtual Chassis
When a backup member takes control of a Virtual Chassis because of a reset or other temporary failure, the backup member uses the MAC address of the old primary switch as the system MAC base address. This process helps ensure a smooth transition of the primary role with no disruption to network connectivity.
The MAC persistence timer is used in situations in which the primary switch is no longer a member of the Virtual Chassis because it has been physically disconnected or removed. If the old primary switch does not rejoin the Virtual Chassis before the timer elapses, the new primary switch starts using its own MAC address as the system’s MAC base address. For information regarding how the system MAC base address is used to assign MAC addresses to ports in a Virtual Chassis, see Understanding MAC Address Assignment on a Virtual Chassis.
The default timer value is 10 minutes. The maximum timer value is 60 minutes.
You can disable the MAC persistence timer starting in Junos OS Release 12.1R3. When the MAC persistence timer is disabled, the MAC address of the old primary switch is used as the system MAC base address; no MAC address changes occur within the Virtual Chassis even when the old primary switch is no longer a member of the Virtual Chassis because it has been physically disconnected or removed.
To configure or modify the MAC persistence timer:
[edit virtual-chassis] user@switch# set mac-persistence-timer minutes
To disable the MAC persistence timer:
[edit virtual-chassis] user@switch# set mac-persistence-timer disable
