Siemens S323, S223 Summary of Path, Automatic Summarization of Path, As-set summary-only

UMN:CLI	User Manual
	SURPASS hiD 6615 S223/S323 R1.5

10.1.2.1Summary 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-setparameter 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-onlyparameter transmits the IP prefix only, suppressing the more- specific routes to all neighbors. Using the as-setparameter 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		Summarizes the information of routes and transmits it
as-set [summary-only]		to the other routers.
	Router	A.B.C.D/M: network address
aggregate-address A.B.C.D/M
		summary-only: transmits IP prefix only.
summary-only [as-set]
		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]	Router	Disables the summarization function of routes.
no aggregate-address A.B.C.D/M
summary-only [as-set]

10.1.2.2Automatic 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	Router	Enables automatic network summarization of a route.
no auto-summary		Disables automatic network summarization of a route.

Please note that, use this feature when you use the basic classes in network.

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