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101

Configuring and Customizing BGP

303528-A Rev 00

8-7

The BGP-4 update message has the same format and contains the same mandatory

attributes as the BGP-3 update message with the following additions:

• In place of the unreachable attribute that BGP-3 includes as part of the path

attribute description, the BGP-4 update includes an unreachable field. This

field specifies destinations that have become unreachable.

• In place of the BGP-3 optional attributes, a BGP-4 update message can

include the optional attributes described in Table 8-2

Table 8-2. BGP-4 Optional Path Attributes

Attribute Description

Multiexit discriminator Chooses between paths to the destinations listed

Local preference Allows AS border routers to indicate the preference

they have assigned to a chosen route when

advertising it to IBGP peers

Atomic aggregate Ensures that certain network layer reachability

information (NLRI) is not deaggregated

Aggregator Identifies 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 Lists the route clusters that may be traversed to

reach a given destination

Advertiser Identifies which border router injected the route

BGP community Identifies the communities to which the route

belongs. (A community is a group of destinations that

share some common property.)

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