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Configuring IP Services
5-12
You set values in BGP-3 accept and announce policy parameters to match and, in
some cases, to override the attribute values contained in inbound and outbound
update messages.
For details about BGP-3 accept policy parameters, see “BGP-3-Specific Accept
Policy Parameters” on page 9-14.
For details about BGP-3 announce policy parameters, see “BGP-3-Specific
Announce Policy Parameters” on page 9-38.
BGP-4 Update Message Format
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 5-2.
Note: For BGP-3, only natural class networks or the default route (0.0.0.0)
can be advertised. BGP-3 assumes that each advertised network is a natural
class network (A, B, or C) based on its high-order bits. It cannot advertise
subnets or supernets.
Table 5-2. 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.
(continued)
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