Enterasys Networks Security Router X-PeditionTM - Manual (Page 155)

Overview
XSR User’s Guide 6-7
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.