User Manual UMN:CLIV810266712.2.7 Default MetricOSPF finds metric based on interface bandwidth. For example, default metric of T1 link is64, but default metric of 64K line is 1562. If there are plural lines in the bandwidth, youcan view costs to use line by assigning metric to each line.To classify costs to use line, use the following command.Command Mode Descriptionauto-cost reference-bandwidth<1-4294967> Router Configures default metric in the unit of Mbps.(default: 100)To delete the configuration, use the following command.Command Mode Descriptionno auto-cost reference-bandwidth Router Deletes the configuration.12.2.8 Graceful Restart SupportYou need to restart OSPF protocol processor when there is network problem. In this case,it takes long time to restarts OSPF and there is no packet transmission. Other routers arealso need to delete routing information and register it again. Graceful Restart improvesthose inconveniences. Although OSPF is restarting, Graceful Restart makes the trans-mission of a packet with routing information.To configure the Graceful Restart, use the following command.Command Mode Descriptioncapability restart {graceful | sig-naling | reliable-graceful} Router Configures the Graceful Restart.no capability restart Releases the configuration.The following items are additional options for the Graceful Restart:• grace-periodWhen OSPF restarts, process is keeping status in graceful for the time configured asgrace-period. After the configured time, OSPF operates in normal.• helperThis is functions that helps other routers around the restarting router. It makes restarting router as a working and transmitting to other routers. only-reload is for thecase of OSPF router is restarting, only-upgrade is for the OSPF router which is up-grading software, and max-grace-period works when grace-period from otherrouters has less value than it. Configuration for Helper can be selected more than 2options without order.
