Dell MX9116n EMC SmartFabric OS10 User Guide - Page 663

Parameters • start-time - Sets the initial SPF delay in milliseconds, from 1 to 600000; default 1000. • hold-time - Sets the additional hold time between two SPF calculations in milliseconds, from 1 to 600000; default 10000. • max-wait - Sets the maximum wait time between two SPF calculations in milliseconds, from 1 to 600000; default 10000. Default • start-time - 1000 milliseconds • hold-time - 10000 milliseconds • max-wait - 10000 milliseconds Command Mode ROUTER-OSPFv3 Usage Information 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 delays for double the configured hold time up to maximum wait time. • If no topology change occur, an SPF calculation performs and the hold timer resets 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 OTM allows you to track the link status of Layer 2 (L2) interfaces, and the reachability of IPv4 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 virtual router redundancy protocol (VRRP) and policy-based routing (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 report to a client application. VRRP subscribes to a track object which tracks the interface line protocol state. It uses 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 how you configure the new priority for the tracked state. When the tracked state comes up, VRRP restores the original priority for the virtual router group. Layer 3 663