Route Capacity Configuration Overview - Huawei Quidway S5600 Series Operation Manual

Operation Manual – Routing Protocol
Quidway S5600 Series Ethernet Switches-Release 1510
Chapter 7 Route Capacity Configuration

7.1 Route Capacity Configuration Overview

7.1.1 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 S5600 series provide 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.
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.
7.1.2 Route Capacity Limitation on the S5600 Series
Huge routing tables are usually caused by OSPF and BGP routes. Therefore, the route
capacity limitation implemented by a S5600 switch 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.
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Chapter 7 Route Capacity Configuration