Command Line Reference Guide

710 | IPv6 Border Gateway Protocol (IPv6 BGP)
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Usage
Information
If you enter bgp dampening, the default values for half-life, reuse, suppress, and
max-suppress-time are applied. The parameters are position-dependent, therefore, if you configure
one parameter, you must configure the parameters in the order they appear in the command.
Related
Commands
bgp default local-preference
c e s
Change the default local preference value for routes exchanged between internal BGP peers.
Syntax
bgp default local-preference value
To return to the default value, enter no bgp default local-preference.
Parameters
Defaults
100
Command Modes
ROUTER BGP
Command
History
=
Usage
Information
The bgp default local-preference command setting is applied by all routers within the AS.
bgp enforce-first-as
c e s
Disable (or enable) enforce-first-as check for updates received from EBGP peers.
Syntax
bgp enforce-first-as
To turn off the default, use the no bgp enforce-first-as command.
Defaults
Enabled
Command Modes
ROUTER BGP
Usage
Information
This is enabled by default, that is for all updates received from EBGP peers, BGP ensures that the first
AS of the first AS segment is always the AS of the peer. If not, the update is dropped and a counter is
incremented. Use the show ip bgp ipv6 unicast neighbors command to view the “failed enforce-first-as
check counter.
If enforce-first-as is disabled, it can be viewed via the show ip protocols command.
show ip bgp ipv6 unicast dampened-paths View the BGP paths
value
Enter a number to assign to routes as the degree of preference for those routes. When routes are
compared, the higher the degree of preference or local preference value, the more the route is
preferred.
Range: 0 to 4294967295
Default: 100
Version 8.4.2.1 Introduced on C-Series and S-Series.
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.4.1.0 Introduced on E-Series TeraScale