Siemens S223 - Manual (Page 320)

UMN:CLI User Manual
SURPASS hiD 6615 S223/S323 R1.5
320 A50010-Y3-C150-2-7619
10.1.2.1 Summary of Path
Aggregation combines the characteristics of several different routes and advertises a sin-
gle route. In the example of 2 routes information of 172.16.0.0/24 and 172.16.1.0/24, the
as-set
parameter creates an aggregate entry advertising the path for a single route of
172.16.0.0/23, consisting of all elements contained in all paths being summarized. Use
this feature to reduce the size of path information by listing the AS number only once,
even if it was included in multiple paths that were aggregated. And it’s useful when ag-
gregation of information results in incomplete path information.
Using the summary-only parameter transmits the IP prefix only, suppressing the more-
specific routes to all neighbors. Using the as-set parameter transmits a single AS path in-
formation only, one of AS numbers of each path.
To summarize route’s information for the transmission, use the following command.
Command Mode Description
aggregate-address A.B.C.D/M
as-set [summary-only]
aggregate-address A.B.C.D/M
summary-only [as-set]
Router
Summarizes the information of routes and transmits it
to the other routers.
A.B.C.D/M: network address
summary-only: transmits IP prefix only.
as-set: transmits one AS-path information.
To delete the route’s information of specific network address, use the following command.
Command Mode Description
no aggregate-address A.B.C.D/M
as-set [summary-only]
no aggregate-address A.B.C.D/M
summary-only [as-set]
Router Disables the summarization function of routes.
10.1.2.2 Automatic Summarization of Path
Automatic summarization is new feature to expend the route information up to the class of
specified IP address on interface connected directly to BGP router. For example, A class
is fundamentally had “/8” as the subnet mask in case IP address assigned 100.1.1.1 in A
class. It can generate route information of 100.0.0.0/8.
To enable/disable automatic summarization of the route, use the following command.
Command Mode Description
auto-summary Enables automatic network summarization of a route.
no auto-summary
Router
Disables automatic network summarization of a route.
Please note that, use this feature when you use the basic classes in network.
!