Chapter 14: VRRP Configuration Guide206 SmartSwitch Router User Reference Manualip-redundancy showThe ip-redundancy show command reports information about a VRRP configuration. Todisplay VRRP information, enter the following commands in Enable mode.VRRP Configuration Notes• The Master router sends keep-alive advertisements. The frequency of these keep-aliveadvertisements is determined by setting the Advertisement interval parameter. Thedefault value is 1 second.• If a Backup router doesn’t receive a keep-alive advertisement from the current Masterwithin a certain period of time, it will transition to the Master state and start sendingadvertisements itself. The amount of time that a Backup router will wait before itbecomes the new Master is based on the following equation:Master-down-interval = (3 * advertisement-interval) + skew-timeThe skew-time depends on the Backup router's configured priority:Skew-time = ( (256 - Priority) / 256 )Therefore, the higher the priority, the faster a Backup router will detect that the Masteris down. For example:– Default advertisement-interval = 1 second– Default Backup router priority = 100– Master-down-interval = time it takes a Backup to detect the Master is down= (3 * adv-interval) + skew-time= (3 * 1 second) + ((256 - 100) / 256)= 3.6 seconds• If a Master router is manually rebooted, or if its interface is manually brought down, itwill send a special keep-alive advertisement that lets the Backup routers that a newMaster is needed immediately.Display information about allvirtual routers.ip-redundancy show vrrpDisplay information about allvirtual routers on a specifiedinterface.ip-redundancy show vrrp interface Display detailed statistics abouta specific virtual routerip-redundancy show vrrp interface verbose
