Peer-As - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

peer-as

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Copyright © 2010, Juniper Networks, Inc.
peer-as autonomous-system;
[edit logical-systems logical-system-name protocols bgp],
[edit logical-systems logical-system-name protocols bgp group group-name],
[edit logical-systems logical-system-name protocols bgp group group-name neighbor address],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols
bgp],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols
bgp group group-name],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols
bgp group group-name neighbor address],
[edit protocols bgp],
[edit protocols bgp group group-name],
[edit protocols bgp group group-name neighbor address],
[edit routing-instances routing-instance-name protocols bgp],
[edit routing-instances routing-instance-name protocols bgp group group-name],
[edit routing-instances routing-instance-name protocols bgp group group-name
neighbor address]
Statement introduced before Junos OS Release 7.4.
Statement introduced in Junos OS Release 9.0 for EX Series switches.
Specify the neighbor (peer) AS number.
The autonomous system (AS) numeric range in plain-number format has been extended
in Junos OS Release 9.1 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 the 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.
—AS number.
autonomous-system
Range: 1 through 4,294,967,295 (2
Range: 1 through 65,535 in plain-number format for 2-byte AS numbers (this is a subset
of the 4-byte range)
Range: 0.0 through 65535.65535 in AS-dot notation format for 4-byte AS numbers
routing—To view this statement in the configuration.
routing-control—To add this statement to the configuration.
Chapter 79: Configuration Statements for Layer 3 Protocols
32
– 1) in plain-number format for 4-byte AS numbers
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