- play_arrow Working With Network Director
- play_arrow About Network Director
- play_arrow Installing Network Director
- play_arrow Accessing Network Director
- play_arrow Understanding Network Director System Administration and Preferences
- play_arrow Getting Started with Network Director
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- play_arrow Working in Deploy Mode
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- play_arrow Deploying and Managing Device Configurations
- Deploying Configuration to Devices
- Managing Configuration Deployment Jobs
- Deploy Configuration Window
- Importing Configuration Data from Junos OS Configuration Groups
- Enabling High-Frequency Traffic Statistics Monitoring on Devices
- Configuring Network Traffic Analysis
- Approving Change Requests
- Enabling SNMP Categories and Setting Trap Destinations
- Understanding Resynchronization of Device Configuration
- Resynchronizing Device Configuration
- Managing Device Configuration Files
- Creating and Managing Baseline of Device Configuration Files
- play_arrow Deploying and Managing Software Images
- play_arrow Managing Devices
- play_arrow Setting Up Zero Touch Provisioning for Devices
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- play_arrow Monitoring Devices and Traffic
- play_arrow About Monitor Mode
- play_arrow Monitoring Traffic
- play_arrow Monitoring Client Sessions
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- play_arrow Monitoring Virtual Networks
- play_arrow General Monitoring
- play_arrow Monitor Reference
- 802.11 Packet Errors Monitor
- Access vs. Uplink Port Utilization Trend Monitor
- Current Sessions Monitor
- Current Sessions by Type Monitor
- Error Trend Monitor
- Equipment Summary By Type Monitor
- Node Device Summary Monitor
- Port Status Monitor
- Port Status for IP Fabric Monitor
- Port Utilization Monitor
- Power Supply and Fan Status Monitor
- Resource Utilization Monitor for Switches, Routers, and Virtual Chassis
- Status Monitor for Junos Fusion Systems
- Status Monitor for Layer 3 Fabrics
- Status Monitor for Switches and Routers
- Status Monitor for Virtual Chassis
- Status Monitor for Virtual Chassis Members
- Top Talker - Wired Devices Monitor
- Traffic Trend Monitor
- Unicast vs Broadcast/Multicast Monitor
- Unicast vs Broadcast/Multicast Trend Monitor
- User Session Details Window
- Virtual Chassis Topology Monitor
- VC Equipment Summary By Type Monitor
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- play_arrow Using Fault Mode
- play_arrow About Fault Mode
- play_arrow Using Fault Mode
- play_arrow Fault Reference
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- play_arrow Working in Report Mode
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- play_arrow Creating and Managing Reports
- play_arrow Report Reference
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- play_arrow About Network Director Mobile
- play_arrow Getting Started with Network Director Mobile
- play_arrow Working in the Network Director Mobile Dashboard Mode
- play_arrow Working in the Network Director Mobile Devices Mode
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Understanding VRRP Profiles
Virtual Router Redundancy Protocol (VRRP) enables hosts on a LAN to make use of redundant routing devices on that LAN without requiring more than the static configuration of a single default route on the hosts. The routing device on which VRRP is enabled share the IP address corresponding to the default route configured on the hosts. At any time, one of the routing devices is the primary (active) and the others are backups. If the primary fails, one of the backup routers becomes the new primary, providing a virtual default routing platform and enabling traffic on the LAN to be routed without relying on a single routing device. Using VRRP, a backup routing device can take over a failed primary router within a few seconds and without any interaction with the hosts.
Routing devices on which VRRP is enabled dynamically elect the primary and backup devices. You can also configure the assignment of the primary and the backup routers by specifying the priorities from 1 through 255 for primary-role election, with 255 being the highest priority. VRRP functions by the default primary sending advertisements to the backup devices at regular intervals. The default interval is 1 second, but you can set this interval. If a backup device does not receive an advertisement for the set period, the backup device with the next highest priority takes over as primary and begins forwarding packets. To minimize network traffic, VRRP is designed in such a way that only the device that is acting as the primary sends out VRRP advertisements at any given point in time. The backup devices do not send any advertisement until and unless they take over as the primary.
The following figure illustrates a basic VRRP topology. In this example, routers A, B, and C are running VRRP and together they function as a virtual router. The IP address of this virtual router is 10.10.0.1 (the same address as the physical interface of Router A).
Because the virtual router uses the IP address of the physical interface of router A, router A is the primary router, while routers B and C function as backup VRRP routers. Clients 1 through 3 are configured with the default gateway IP address of 10.10.0.1. As the primary router, router A forwards packets sent to its IP address. If the primary virtual router fails, the backup router configured with the higher priority becomes the primary virtual router and provides uninterrupted service for the LAN hosts. When router A recovers, it becomes the primary virtual router again.
