181When configuring collaboration between track and BFD, do not configure the local address or remoteaddress of a BFD session as the virtual IP address of a VRRP group.Configuring collaboration between the track module and theinterface management moduleThrough the following configuration, you can establish collaboration between the track moduleand the interface management module, which informs the track module of the changes of thephysical status and Layer 3 protocol status of an interface.To configure collaboration between the track module and the interface management module:To do… Use the command… Remarks1. Enter system view system-view —2. Create a track entry, associate it with theinterface management module to monitor thephysical status of an interface, and specify thedelay time for the track module to notify theapplication modules when the track entrystatus changestrack track-entry-numberinterface interface-type interface-number [ delay { negativenegative-time | positive positive-time } * ]RequiredUse either approachNo track entry that isassociated with theBFD session iscreated by default.3. Create a track entry, associate it with theinterface management module to monitor theLayer 3 protocol status of an interface, andspecify the delay time for the track module tonotify the application modules when the trackentry status changestrack track-entry-numberinterface interface-type interface-number protocol { ipv4 | ipv6} [ delay { negative negative-time | positive positive-time } * ]Configuring collaboration between the trackmodule and the application modulesConfiguring track-VRRP collaborationVRRP is an error-tolerant protocol. It adds a group of routers that can act as network gateways toa VRRP group, which forms a virtual router. Routers in the VRRP group elect the master acting asthe gateway according to their priorities. A router with a higher priority is more likely to becomea master. The other routers function as the backups. When the master fails, to ensure that thehosts in the network segment can communicate with the external networks uninterruptedly, thebackups in the VRRP group elect a new gateway to undertake the responsibility of the failedmaster.When VRRP works in standard protocol mode or load balancing mode, through the track-VRRPcollaboration, you can:• Change the priority of a router according to the status of the uplink. If there is a fault on theuplink of the router, the VRRP group cannot be aware of the uplink failure. If the router is the
