Huawei Quidway S6500 Series Operation Manual page 278

Operation Manual - Routing Protocol
Quidway S6500 Series Ethernet Switches
Chapter 8 Route Capacity Configuration
8.1 Route Capacity Configuration Overview
8.1.1 Introduction
In practical networking applications, there is always a large number of routes in the
routing table especially OSPF routes and BGP routes. The routing information is
usually stored in the memory of the Ethernet switch. When the size of the routing table
increases, the total memory of the Ethernet switch will not change (unless the hardware
is upgraded but upgrading cannot be guaranteed to solve all problems).
In order to solve such problem, Quidway S6500 Series Ethernet Switches provide a
mechanism to control the size of the routing table: Monitor the free memory in the
system to determine whether to add new routes to the routing table and whether to
keep connection with a routing protocol.
Note:
It should be noted that the default value meets the requirements normally. The user is
not recommended to modify the configuration to avoid improper configuration to avoid
reducing of stability and availability of the system.
8.1.2 Route Capacity Limitation Implemented by S6500 Series Ethernet
Switches
Usually, the huge size of the routing table is caused by BGP routes and OSPF routes.
Therefore, the route capacity limitation of S6500 Series Ethernet Switches are only
effective to these two types of routes and has no impact on static routes and other
dynamic routing protocols.
When the free memory of an Ethernet switch reduces to the lower limit value, the
system will disconnect BGP and OSPF and remove corresponding routes from the
routing table so that the memory occupied is released. The system checks the free
memory periodically. When the free memory is detected to restore to the safety value,
BGP and OSPF connection will be restored.
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Chapter 8 Route Capacity Configuration