Huawei Quidway S6500 Series Operation Manual page 184

Operation Manual - Routing Protocol
Quidway S6500 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 supports the route summarization of imported routes.
Perform the following configurations in OSPF view.
Operation
Huawei Technologies Proprietary
4-16
Chapter 4 OSPF Configuration
Command
abr-summary ip-address
[ advertise | not-advertise ]
undo abr-summary ip-address mask
mask