HP ProCurve 7102dl Reference Manual page 1320
Secure router sros command line interface
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Also See for ProCurve 7102dl:
- Configuration manual (1114 pages) ,
- Product end-of-life disassembly instructions (2 pages) ,
- Advanced management and configuration manual (1005 pages)
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SROS Command Line Interface Reference Guide
local-as <as-number>
Use the local-as command to specify an autonomous system (AS) number for the unit to use when commu-
nicating with this BGP neighbor. Use the no form of this command to return to default settings.
Syntax Description
<as-number>
Default Values
By default, no local AS number is defined. The router's BGP AS number is used.
Functional Notes
This command substitutes a different AS number to be used for communicating with this BGP neighbor.
(other than the one the router is actually a member of). This can be used to satisfy network designs
requiring a customer to appear as one AS number when communicating with one Internet service provider
(ISP) and another when communicating with another ISP.
Usage Examples
The following example configures this BGP neighbor's AS number to be 300:
ProCurve(config)#router bgp 65000
ProCurve(config-bgp)#neighbor 172.24.3.192
ProCurve(config-bgp-neighbor)#local-as 300
Technology Review
This router appears (to the peer router) to be in the AS specified with the local-as command. In network
advertisements from routers using the local-as command, the first router's true AS number (the number
specified using the router bgp as-number command) is prepended to the AS path attribute, then the local
AS (the number specified using the local-as command) is prepended to the AS path attribute. This makes
it appear that the path from this router to the network is first through the local AS, and then through the true
AS. To further illustrate, consider the following example network.
In this network:
•
Router A is in AS 100.
•
Router B is in AS 300.
•
Router A is an eBGP peer with Router B.
•
Router A's connection to Router B specifies a local-as of 200.
•
Router B is configured to connect to Router A in AS 200.
Therefore:
•
To Router B, all aspects of Router A appear as AS 200.
•
Networks advertised from Router A to Router B will have the AS path 200 100 prepended to the AS path
attribute.
•
Router A will add AS 200 to the AS path of networks learned from Router B.
5991-2114
Specifies the AS number to use when communicating with this neighbor. Must be
different than the AS number for this router and the peer router. Only valid for
eBGP connections. Range is 0 to 65,535.
© Copyright 2006 Hewlett-Packard Development Company, L.P.
BGP Neighbor Configuration Command Set
1318
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