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DES-7200 Configuration Guide Chapter 4 OSPF
Configuration
4-27
set to 0 or a small value, so that LSA instances can be generated immediately
when the network topology is comparatively stable; when the network topology
changes frequently, the interval for LSA generation will increase from "hold-time"
following the algorithm of hold-time×2n-1. N refers to the number of changes.
With the increase in the number of repeated LSA generation, the interval for
generation will become larger and larger until the "maximum interval" is reached.
When the interval for LSA generation is larger than the "max-wait-time", the
"delay-time" for generating this LSA will restore to the initial interval.
By default, the initial interval is 0 millisecond, the hold time is 5000 milliseconds,
and the maximum interval is 5000 milliseconds. In this way, the shortest interval
for consecutively generating the same LSA is MinLSInterval, which complies with
RFC 2328.
In routing process configuration mode, the user can execute the following
commands to configure LSA generation rate-limiting algorithm:
Command Function
DES-7200# configure terminal
Enter global configuration mode.
DES-7200(config)# router ospf 1
Enter routing protocol configuration mode.
DES-7200(config-router)# timers
throttle lsa all delay-time hold-time
max-wait-time
(Optional) Configure LSA generation
rate-limiting algorithm. By default, the initial
interval is 0 millisecond, the hold time is 5000
milliseconds, and the maximum interval is
5000 milliseconds.
DES-7200 (config-if)# end
Return to privileged mode.
DES-7200 # write
Save configurations.
Caution
While configuring this command, the "hold-time" cannot be smaller than the
"delay-time", and the "max-wait-time" cannot be smaller than "hold-time".
4.2.18 Configuring OSPF Load Protection
When the memory lacks, OSPF enters the overflow state. In the overflow state,
OSPF protocol will:
For the learned LSA: receive the Inter-Area/Intra-Area LSA; receive the
external LSA if the destination route address represented by LSA is for the
non-default learned route; not receive other LSAs.
For the external LSA generated by itself: clear the external LSAs except for
the default route.