Reference Guide

804 | IPv6 Border Gateway Protocol (IPv6 BGP)
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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
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.
Related
Commands
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 8.3.19.0 Introduced on S4820T
Version 8.4.2.1 Introduced on C-Series and S4810
Version 8.2.1.0 Introduced on E-Series ExaScale
Version 7.4.1.0 Introduced on E-Series TeraScale
show ip bgp ipv6 unicast
neighbors
Display IPv6 routing information exchanged by BGP neighbors.
show ip protocols View Information on routing protocols.