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SROS Command Line Interface Reference Guide
BGP Neighbor Configuration Command Set
5991-2114
© Copyright 2006 Hewlett-Packard Development Company, L.P.
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next-hop-self
Use the
next-hop-self
command to force the next hop attribute to be changed to this unit’s address when
advertising networks that would not have the next hop changed under normal rules. Normal next hop rules
are described in the
Functional Notes
section below. Use the
no
form of this command to cause normal
next hop rules to apply.
Syntax Description
No subcommands.
Default Values
By default, this command is disabled and normal next hop rules apply.
Functional Notes
In eBGP, routes are normally advertised with a next hop set to the IP address that the receiving peer has
configured in its neighbor statement for this router. In the eBGP case where the receiving router is in the
same subnet as the current next hop, the current next hop is not changed.
For broadcast multiaccess networks (Ethernet), this provides more efficient routing. For non-broadcast
multiaccess networks (NBMA) such as Frame Relay with a partial mesh using point-to-multipoint circuits,
this rule can cause significant problems. Since the partial mesh is on the same subnet, BGP applies the
rule of not changing the next hop address, rendering invalid routes in certain topologies. This is one case
where this command is necessary to solve a problem.
Usage Examples
The following example enables
next-hop-self
:
ProCurve(config)#
router bgp 65000
ProCurve(config-bgp)#
neighbor 172.24.3.192
ProCurve(config-bgp-neighbor)#
next-hop-self
Содержание ProCurve Secure 7102dl
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