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Route Capacity 105
routing information not satisfying the requirement, but if all the items are in
the deny mode, no routes will pass the ip-prefix filtering. You can define an
item of permit 0.0.0.0/0 less-equal 32 after the multiple list items in the deny
mode, so as to let all the other routes pass the filtering (If less-equal 32 is not
specified, only the default route will be matched).
Route Capacity In practical networking applications, there is always a large number of routes in
the routing table. The routing information is usually stored in the memory of the
Ethernet switch. When the size of the routing table increases, it can consume a
significant amount of switch’s memory.
The Switch 7750 provides a mechanism to control the size of the routing table. It
monitors the free memory in the system to determine whether 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 should be
careful when modifying the configuration to avoid reducing the stability of the
network.
Configuring Route
Capacity
Route capacity configuration includes tasks described in the following sections:
■ Setting the Lower Limit for Switch Memory
■ Setting the Safety Value for Switch Memory
■ Setting the Lower Limit and the Safety Value Simultaneously
■ Preventing Automatic Recovery of Disconnected Routing Protocols
■ Enabling Automatic Recovery of Disconnected Routing Protocols
■ Displaying and Debugging Route Capacity
Setting the Lower Limit for Switch Memory
When the Ethernet switch memory is equal to or lower than the lower limit,
routes will be disconnected.
Perform the following configurations in system view.
By default, the lower limit of the Ethernet switch memory is 2Mbytes.
The lower limit value set for the memory must be smaller than the safety value.
Setting the Safety Value for Switch Memory
When the amount of free memory is reduced to the safety value but has not
reached the lower limit, you can use the
display memory limit command to see
how much free memory remains.
Table 108 Setting the Lower Limit of the Ethernet Switch Memory
Operation Command
Set the lower limit of the Ethernet switch
memory
memory limit value