Siemens S323, S223 Command Mode Description Bgp bestpath as-path ignore, Aspath, Confed-aspath

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

To ignore AS-path for selecting the best path, use the following command.

Command	Mode	Description
bgp bestpath as-path ignore		Ignores the information of AS-path as a factor in the
		algorithm for choosing the best route.
	Router
no bgp bestpath as-path ignore		Considers the information of AS-path as a factor in the
		algorithm for choosing the best route.

i

If you would like to configure to select the best route by considering AS-path length of Confederation, you should configure the router first to ignore AS-path for choosing the best route using the bgp bestpath as-path ignore command before implementing the following command.

To consider AS-path length of Confederation during the best-path selection process, use the following command.

Command	Mode	Description
bgp bestpath compare-confed-		Considers the information of AS-path length of confed-
		eration as a factor in the algorithm for choosing the best
aspath
	Router	route.
no bgp bestpath compare-		Ignores AS-path length of confederation as a factor in
confed-aspath		the algorithm for choosing the best route.

When comparing similar routes from more than 2 peers the BGP router does not consider router ID of the routes. It selects the first received route. The hiD 6615 S323 uses router ID in the selection process; similar routes are compared and the route with lowest router ID is selected as the best route. Router ID can be manually set by using the following command.

To select the best path by comparing router ID, use the following command. However, the default condition is that BGP receives routes with identical eBGP paths from eBGP peers.

Command		Mode	Description
bgp bestpath compare-routerid			Selects the best path using the router ID for identical
			eBGP paths.
		Router
no bgp bestpath	compare-		Disables selecting the best path using the router ID.
routerid

The hiD 6615 S323 is basically configured not to compare MED values of the path infor- mation that exchanges between the Confederation Peers. But just in case, it can be con- figured to compare MED values of the path information that exchanges between Confed- eration Peers.

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