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266 CHAPTER 16: IP ROUTING PROTOCOL OPERATION
to add new routes to the routing table and whether or not to keep connection with a
routing protocol.
The default value normally meets the network requirements. You must be careful
when modifying the configuration to avoid reducing the stability of the network.
Limiting Route Capacity The size of the routing table is determined by OSPF routes. Therefore, the route
capacity limitation of the Switch 5500 is only effective for these two types of routes
and has no impact on static routes and other dynamic routing protocols.
When the free memory of the Switch 5500 reduces to the lower limit value, the
system will disconnect OSPF and remove the routes from the routing table to release
memory. The system checks the free memory periodically. When enough free memory
is detected the OSPF connection is restored.
Route Capacity
Configuration
Route capacity configuration includes tasks described in the following sections:
■ Setting the Lower Limit and the Safety Value of the Switch Memory
■ Enabling and Disabling Automatic Recovery of Disconnected Routing Protocols
Setting the Lower Limit and the Safety Value of the Switch Memory
When the Switch memory is equal to or lower than the lower limit, OSPF is
disconnected and OSPF routes are removed from the routing table.
Perform the following configuration in the System View.
The lower limit value set for the memory must be smaller than the safety value.
Enabling and Disabling Automatic Recovery of Disconnected Routing
Protocols
If the Automatic Recovery function of the Switch 5500 is disabled, connection to
routing protocols is not restored even if the free memory returns to the safety value.
Therefore, disabling automatic recovery must be performed cautiously.
Perform the following configurations in System View.
By default, automatic recovery of disconnected routing protocols is enabled.
Table 262 Setting the Lower Limit and the Safety Value of the Switch Memory
Operation Command
Set the lower limit and the safety value of the
Switch
memory { safety safety_value | limit
limit_value }*
Restore the lower limit and the safety value
of the Switch to the default value
undo memory [ safety | limit ]
Table 263 Enabling/Disabling the Switch to Recover the Disconnected Routing Protocol
Automatically
Operation Command
Enable memory automatic restoration function memory auto-establish enable
Disable memory automatic restoration function of
a Ethernet switch
memory auto-establish disable