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Configuring IP Services
6-6 114065 Rev. A
Table 6-2. BGP-4 Optional Path Attributes
Attribute Description
Multi-Exit Discriminator Optional attribute used to choose between paths to
the destinations listed.
Local Preference Optional attribute allowing AS border routers to
indicate the preference they have assigned to a
chosen route when advertising it to IBGP peers.
Atomic Aggregate Optional attribute used to ensure that certain network
layer reachability information (NLRI) is not
deaggregated.
Aggregator Optional attribute identifying which AS performed the
most recent route aggregation. The attribute contains
the last AS number that formed the aggregate route
followed by the IP address of the BGP speaker that
formed the aggregate route.
Route Clusters Optional attribute listing the route clusters that may
be traversed to reach a given destination.
Advertiser Optional attribute identifying which border router
injected the route.
BGP Community Optional transitive attribute identifying the
communities to which the route belongs. (A
community is a group of destinations that share
some common property.)
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