H3C S7500 Series Ethernet Switches Operation Manual

Operation Manual – Routing Protocol
H3C S7500 Series Ethernet Switches Chapter 8 Route Capacity Configuration
8-1
Chapter 8 Route Capacity Configuration
When configuring route capacity, go to these sections for information you are
interested in:
z Route Capacity Overview
z Route Capacity Configuration
z Displaying and Maintaining Route Capacity Configuration
8.1 Route Capacity Overview
8.1.1 Introduction
In actual networking applications, there are a large number of routes, especially
OSPF routes, IS-IS 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 S7500 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:
Generally, the default system configuration meets the requirements. To avoid
decreasing system stability and availability due to improper configuration, you are not
recommended to modify the configuration.
8.1.2 Route Capacity Limitation on the S7500 Series
Huge routing tables are usually caused by IS-IS, BGP and OSPF routes. Therefore,
the route capacity limitation implemented by a S7500 switch applies to IS-IS, BGP
and OSPF routes only but not to static routes and other dynamic routing protocols.
When the free memory of a switch is equal to or lower than the lower limit, IS-IS, BGP
or OSPF connection will be disconnected and corresponding routes will be removed
from the routing table.
The system periodically checks the free memory. 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 IS-IS, BGP or OSPF