Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 413

Default • start-time - 1000 milliseconds • hold-time - 10000 milliseconds • max-wait - 10000 milliseconds Command Mode Usage Information ROUTER-OSPFv3 OSPFv2 and OSPFv3 support SPF throttling. By default, SPF timers are disabled in an OSPF instance. Use SPF throttling to delay SPF calculations during periods of network instability. In an OSPF network, a topology change event triggers an SPF calculation after a specified start time. When the start timer finishes, a hold time may delay the next SPF calculation for an additional time. When the hold timer is running: • Each time a topology change occurs, the SPF calculation is delayed for double the configured hold time up to maximum wait time. • If no topology change occurs, an SPF calculation is performed and the hold timer is reset to its configured value. If you do not specify a start-time, hold-time or max-wait value, the default values are used. The no version of this command removes the configured SPF timers and disables SPF throttling in an OSPF instance. Example OS10(config)# router ospfv3 100 OS10(config-router-ospfv3-100)# timers spf 1345 2324 9234 OS10(config-router-ospfv3-100)# do show ipv6 ospf Routing Process ospfv3 100 with ID 129.240.244.107 SPF schedule delay 1345 msecs, Hold time between two SPFs 2324 msecs Min LSA origination 5000 msec, Min LSA arrival 1000 msec Min LSA hold time 0 msec, Max LSA wait time 0 msec Number of area in this router is 1, normal 1 stub 0 nssa Area (0.0.0.1) Number of interface in this area is 1 SPF algorithm executed 2 times Supported Releases 10.4.0E(R1) or later Object tracking manager Object tracking manager (OTM) allows you to track the link status of Layer 2 interfaces, and the reachability of IP and IPv6 hosts. You can increase the availability of the network and shorten recovery time if an object state goes Down. Object tracking monitors the status of tracked objects and communicates any changes made to interested client applications. OTM client applications are VRRP and PBR. Each tracked object has a unique identifying number that clients use to configure the action to take when a tracked object changes state. You can also optionally specify a time delay before changes in a tracked object's state are reported to a client application. VRRP can subscribe to a track object which tracks the interface line protocol state. It can use the tracked object status to determine the priority of the VRRP router in a VRRP group. If a tracked state, or interface goes down, VRRP updates the priority based on what you configure the new priority to be for the tracked state. When the tracked state comes up, VRRP restores the original priority for the virtual router group. Layer 3 413