Configuration

In order to configure failover or load balancing with VRRP, the following parameters can be set:

• Activation: The switch 'VRRP activate' enables the VRRP module to be switched on or off (default = off).
• VRRP list: In the VRRP list, up to 16 virtual routers can be defined. This table has the following fields:
  • Router ID: Unique ID for the virtual router. Values between 1 and 255 are possible. The router ID is used to consolidate several physical routers into a single virtual router or a standby group.
  • Router IP: IP address for the virtual router.
    Note: All routers on which the virtual router is set up must assign this router the same IP address.
  • Main priority: The main priority of the virtual router with regard to routers with several interfaces refers to the main interface, i.e. with routers with DSL and ISDN support to the DSL interface. Values between 0 and 255 are permitted. The values 0 and 255 have special meanings:
  '0' turns the virtual router off.
  • '255' is only accepted when the virtual router address is identical to the address of the interface that is connected to the router. In other cases, the priority is automatically lowered.
  • Backup priority: The backup priority of the virtual router refers to the interface for which a backup connection is configured, i.e. with routers with DSL and ISDN support to the ISDN interface. Here again, values between 0 and 255 are permitted. The values 0 and 255 also have special meanings here:
  0 disables the virtual router in the backup event. Checks are conducted regularly in order to determine whether or not the standard connection can be reestablished. The inspection interval is defined in the reconnect delay. '255' is only accepted when the virtual router address is identical to the address of the interface that is connected to the router. In other cases, the priority is automatically lowered. When the backup connection cannot be established in backup mode, then the virtual router logs off completely and attempts to reestablish the standard or backup connection in intervals defined by the reconnect delay.
  • Remote site: Name of the remote station that controls the virtual router behavior. The remote site can also be assigned to other virtual routers.
    Note: Entering the remote site is optional. Linking the backup requirement to a remote site allows the use of the LANCOM-specific enhancement to VRRP not only to secure against device failure (VRRP standard) but also against interface failure or disruption at a remote site.
  • Comment: 64 character-long commentary describing the virtual router.
• Reconnect delay: The reconnect delay time shows after how many minutes a virtual router that has logged off attempts to reestablish its standard connection. The router remains logged off during this connection attempt. It is only broadcasted with its main or backup priority after the connection has been established successfully. The default value is 30 minutes.
• Advert. interval: The advertising interval shows how many seconds until a virtual router is propagated again. The default value is 1 second.
  Note: With a propagation time of 1 second, the routers in the VRRP group can change quickly when a device or interface fails. An interruption of this type will usually remain undetected due to the fact that the TCP connection is not interrupted. Other routing protocols require up to 5 minutes or longer in order to conduct the transfer to a backup router.
• Internal services: The Internal services check box controls how the device should behave when it is addressed via a virtual router address.
  • In the 'On' position, the LANCOM reacts to certain services exactly as if it had been addressed via its actual address. Naturally, this only occurs when the device itself is the master of the virtual router. The behavior of the DHCP server changes simultaneously.
  • The default setting 'Off' results in behavior in accordance with the RFC, meaning means that the corresponding packets are silently dropped.
  • The default setting is 'On'.
  
  
  
  
  

LANconfig: IP router / VRRP

WEBconfig: LCOS menu tree / Setup / IP router / VRRP