Enterasys Networks X-PeditionTM manual Weight, Atomic Aggregate

Overview

Weight

Weight, as shown in Figure 6-4, and LOCAL_PREF attributes are similar except that weight is not exchanged between routers. It is significant only locally. Higher preference is accorded the route with a higher weight. Weight can be used to influence routes coming from different providers to the same router (one router with multiple connections to two or more providers).

The attribute is configured with the set weight command.

Figure 6-4 Weight Applied to Differentiate Between Routes from Multiple Sources

Atomic Aggregate

The XSR automatically sets the ATOMIC_AGGREGATE attribute if the aggregate that a BGP speaker distributes is selected as less specific than a route included with it. A route with this attribute cannot be de-aggregated (made more specific). Forwarding along such a route does not ensure that IP packets will actually cross only AS's listed in the route’s AS_PATH attribute.

XSR User’s Guide 6-7