Configuring Stub Area Of Ospf - Huawei Quidway S3500 Series Operation Manual

Operation Manual - Routing Protocol
Quidway S3500 Series Ethernet Switches
Table 4-12 Setting an Interval for LSA Retransmission between Neighboring Routers
Configure the interval of LSA retransmission for the
neighboring routers
Restore the default LSA retransmission interval for the
neighboring routers
By default, the interval for neighboring routers to retransmit LSAs is five seconds.
The value of interval should be bigger than the interval in which a packet can be
transmitted and returned between two routers.
Note that you should not set the LSA retransmission interval too small. Otherwise,
unnecessary retransmission will be caused.
4.2.13 Setting a Shortest Path First (SPF) Calculation Interval for OSPF
Whenever the LSDB of OSPF takes changes, the shortest path requires recalculation.
Calculating the shortest path upon change will consume enormous resources as well
as affect the operation efficiency of the router. Adjusting the SPF calculation interval,
however, can restrain the resource consumption due to frequent network changes.
Perform the following configuration in OSPF view.
Table 4-13 Setting the SPF calculation interval
Set the SPF calculation interval
Restore the SPF calculation interval
By default, the interval of SPF recalculation is 5 seconds.

4.2.14 Configuring STUB Area of OSPF

STUB areas are some special LSA areas, in which the ABRs do not propagate the
learned external routes of the AS. In these areas, the routing table sizes of routers and
the routing traffic are significantly reduced.
The STUB area is an optional configuration attribute, but not every area conforms to
the configuration condition. Generally, STUB areas, located at the AS boundaries, are
those non-backbone areas with only one ABR. Even if this area has multiple ABRs, no
virtual links are established between these ABRs.
To ensure that the routes to the destinations outside the AS are still reachable, the ABR
in this area will generate a default route (0.0.0.0) and advertise it to the non-ABR
routers in the area.
Operation
Operation
Huawei Technologies Proprietary
4-12
Chapter 4 OSPF Configuration
Command
ospf timer retransmit
interval
undo
retransmit
Command
spf-schedule-interval seconds
undo spf-schedule-interval seconds
ospf timer