3Com 7700 Configuration Manual page 159

Setting the Lower Limit for Switch Memory
When the Ethernet switch memory is equal to or lower than the lower limit, BGP
and OSPF will be disconnected.
Perform the following configurations in system view.
Table 130 Set the Lower Limit of the Ethernet Switch Memory
Operation
Set the lower limit of the Ethernet switch
memory
By default, the lower limit of the Ethernet switch memory is 2Mbytes, that is,
when the available memory is less than 2Mbytes, BGP and OSPF will be
disconnected and BGP routes and OSPF routes will be removed from the routing
table.
The lower limit value set for the memory must be smaller than the safety value.
Setting the Safety Value for Switch Memory
When the free memory value reduces to the safety value but does not reach the
lower limit value yet, the display memory limit command can be used to see if
the memory is in a urgent state.
If memory automatic restoration is enabled, when the free memory of the
Ethernet switch exceeds the safety value, the disconnected BGP and OSPF will be
restored.
Perform the following configurations in system view.
Table 131 Set the Safety Value of the Ethernet Switch Memory
Operation
Set the safety value of the Ethernet switch
memory
By default, the safety value of the Ethernet switch memory is 4Mbytes.
The safety value of the Ethernet switch memory must be larger than the lower
limit value.
Setting the Lower Limit and the Safety Value Simultaneously
When you need to modify both the lower limit and the safety value of the
Ethernet switch memory, you can (and are recommended to) simultaneously
modify the two configurations.
You can also restore the lower limit and the safety value of the Ethernet switch
memory to the default value at the same time if it is necessary.
Route Capacity
Command
memory limit value
Command
memory safety value
151