Operation Manual – Routing ProtocolH3C S7500 Series Ethernet Switches Chapter 8 Route Capacity Configuration8-1Chapter 8 Route Capacity ConfigurationWhen configuring route capacity, go to these sections for information you areinterested in:z Route Capacity Overviewz Route Capacity Configurationz Displaying and Maintaining Route Capacity Configuration8.1 Route Capacity Overview8.1.1 IntroductionIn actual networking applications, there are a large number of routes, especiallyOSPF routes, IS-IS routes and BGP routes, in the routing table. If the routing tableoccupies too much memory, the switch performance will decline.To solve this problem, the S7500 series provide a mechanism to control the size of therouting table; that is, monitoring the free memory in the system to determine whetherto add new routes to the routing table and whether to keep the connection of a routingprotocol.Caution:Generally, the default system configuration meets the requirements. To avoiddecreasing system stability and availability due to improper configuration, you are notrecommended to modify the configuration.8.1.2 Route Capacity Limitation on the S7500 SeriesHuge routing tables are usually caused by IS-IS, BGP and OSPF routes. Therefore,the route capacity limitation implemented by a S7500 switch applies to IS-IS, BGPand OSPF routes only but not to static routes and other dynamic routing protocols.When the free memory of a switch is equal to or lower than the lower limit, IS-IS, BGPor OSPF connection will be disconnected and corresponding routes will be removedfrom the routing table.The system periodically checks the free memory. If automatic protocol connectionrecovery is enabled, when the free memory of the switch restores to a value largerthan the safety value, the switch automatically re-establishes the IS-IS, BGP or OSPF
