As-Path (Routing Options) - Juniper ACX1000 Configuration Manual

as-path (Routing Options)

Syntax
Hierarchy Level
Release Information
Description
Default
Options
Copyright © 2017, Juniper Networks, Inc.
as-path <as-path> <aggregator as-number ip-address> <atomic-aggregate> <origin (egp |
igp | incomplete)>;
[edit logical-systems logical-system-name routing-instances routing-instance-name
routing-options (aggregate
[edit logical-systems logical-system-name routing-instances routing-instance-name
routing-options rib routing-table-name
[edit logical-systems logical-system-name routing-options
(defaults | route)],
[edit logical-systems logical-system-name routing-options rib routing-table-name
generate | static) (defaults | route)],
[edit routing-instances routing-instance-name routing-options
(defaults | route)],
[edit routing-instances routing-instance-name routing-options rib routing-table-name
(aggregate | generate | static) (defaults | route)],
[edit routing-options (aggregate
[edit routing-options rib routing-table-name
Statement introduced before Junos OS Release 7.4.
Statement introduced in Junos OS Release 9.0 for EX Series switches.
Statement introduced in Junos OS Release 11.3 for the QFX Series.
Statement introduced in Junos OS Release 12.3 for ACX Series routers.
Statement introduced in Junos OS Release 14.1X53-D20 for the OCX Series.
Associate BGP autonomous system (AS) path information with a static, aggregate, or
generated route.
In Junos OS Release 9.1 and later, the numeric range for the AS number is extended to
provide BGP support for 4-byte AS numbers as defined in RFC 4893, BGP Support for
Four-octet AS Number Space. RFC 4893 introduces two new optional transitive BGP
attributes, AS4_PATH and AS4_AGGREGATOR. These new attributes are used to
propagate 4-byte AS path information across BGP speakers that do not support 4-byte
AS numbers. RFC 4893 also introduces a reserved, well-known, 2-byte AS number, AS
23456. This reserved AS number is called AS_TRANS in RFC 4893. All releases of Junos
OS support 2-byte AS numbers.
In Junos OS Release 9.2 and later, you can also configure a 4-byte AS number using the
AS-dot notation format of two integer values joined by a period: <16-bit high-order value
in decimal>.<16-bit low-order value in decimal>. For example, the 4-byte AS number
of 65,546 in plain-number format is represented as 1.10 in the AS-dot notation format.
You can specify a value in the range from 0.0 through 65535.65535 in AS-dot notation
format.
No AS path information is associated with static routes.
—(Optional) Attach the BGP
aggregator
You must specify the last AS number that formed the aggregate route (encoded as
| generate | static) (defaults | route)],
(aggregate | generate
| generate | static) (defaults | route)],
(aggregate | generate
path attribute to the aggregate route.
aggregator
Chapter 41: Configuration Statements
| static) (defaults | route)],
(aggregate | generate | static)
(aggregate
(aggregate | generate | static)
| static) (defaults | route)]
|
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