3Com Switch 7750 Configuration Guide Guide

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ROUTE CAPACITY CONFIGURATION
Route Capacity
Configuration
Overview
Introduction In actual networking applications, there are a large number of routes, especially
OSPF routes and BGP routes, in the routing table. If the routing table occupies too
much memory, the switch performance will decline.
To solve this problem, the Switch 7750 Family provides a mechanism to control the
size of the routing table; that is, monitoring the free memory in the system to
determine whether to add new routes to the routing table and whether to keep
the connection of a routing protocol.
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CAUTION: The default system configuration meets the requirements. To avoid
decreasing system stability and availability due to improper configuration, it is not
recommended to modify the configuration.
Route Capacity
Limitation on the Switch
7750 Family
Huge routing tables are usually caused by OSPF and BGP routes. Therefore, the
route capacity limitation implemented by the Switch 7750 Family applies to OSPF
and BGP routes only but not to static and RIP routes.
When the free memory of the switch is equal to or lower than the lower limit,
OSPF or BGP connection will be disconnected and OSPF or BGP routes will be
removed from the routing table.
If automatic protocol connection recovery is enabled, when the free memory of
the switch restores to a value larger than the safety value, the switch automatically
re-establishes the OSPF or BGP connection. If the automatic protocol connection
recovery function is disabled, the switch will not reestablish the disconnected OSPF
or BGP connection even when the free memory restores to a value larger than the
safety value.
Route Capacity
Configuration
Route capacity configuration includes:
■ Setting the lower limit and the safety value of switch memory,
■ Enabling/disabling the switch to recover the disconnected routing protocol
automatically.
Setting the Lower Limit
and the Safety Value of
the Switch Memory
Perform the following configuration in system view.