Configuring The Route Summarization Of Ospf Area; Configuring Summarization Of Imported Routes By Ospf - Huawei Quidway S3500 Series Operation Manual

Operation Manual - Routing Protocol
Quidway S3500 Series Ethernet Switches

4.2.16 Configuring the Route Summarization of OSPF Area

Route summary means that ABR can aggregate information of the routes of the same
prefix and advertise only one route to other areas. An area can be configured with
multiple aggregate segments, thereby OSPF can summarize them. When the ABR
transmits routing information to other areas, it will generate Sum_net_Lsa (type-3 LSA)
per network. If some continuous networks exist in this area, you can use the
abr-summary command to summarize these segments into one segment. Thus, the
ABR only needs to send an aggregate LSA, and all the LSAs in the range of the
aggregate segment specified by the command will not be transmitted separately.
Once the aggregate segment of a certain network is added to the area, all the internal
routes of the IP addresses in the range of the aggregate segment will no longer be
separately advertised to other areas. Only the route summary of the whole aggregate
network will be advertised. But if the range of the segment is restricted by the keyword
"not-advertise", the route summary of this segment will not be advertised. This
segment is represented by IP address and mask.
Route summarization can take effect only when it is configured on ABRs.
Perform the following configuration in OSPF Area view.
Table 4-16 Configuring the route summarization of OSPF area
Configure the Route Summarization of
OSPF Area
Cancel route summarization of OSPF
Area
By default, the inter-area routes will not be summarized.

4.2.17 Configuring Summarization of Imported Routes by OSPF

OSPF of Quidway S3500 Series Ethernet Switches support route summarization of
imported routes.
Perform the following configurations in OSPF view.
Table 4-17 Configuring summarization of imported routes by OSPF
configure summarization of imported
routes by OSPF
Remove
imported into OSPF
Operation
Operation
summarization of
Huawei Technologies Proprietary
4-15
abr-summary
[ advertise | not-advertise ]
undo abr-summary ip-address mask
asbr-summary
[ not-advertise | tag value ]
routes
undo asbr-summary ip-address mask
Chapter 4 OSPF Configuration
Command
ip-address mask
Command
ip-address mask