.. _example_protocols_bgp_parameters_default:
#######
Default
#######
Scenario to verify BGP **default** parameter configuration.
BGP default parameters control baseline behavior for all peers unless explicitly overridden.
The ``local-pref`` option sets the default local preference value used in the BGP decision
process when comparing routes. Higher values indicate more preferred routes, and this applies
to all iBGP routes received from peers.
In this test suite, **DUT0** establishes iBGP sessions with **DUT1** to verify default
parameter behavior. For local preference, routes received from DUT1 demonstrate how the
configured default value influences route selection.
*************************************************
Test BGP Basic Session Without Default Parameters
*************************************************
Description
===========
This test verifies basic iBGP session establishment without any default parameters
configured. **DUT0** (AS 100) establishes an iBGP session with **DUT1** (AS 100) which
advertises a connected network. Without any default parameter configuration, BGP uses
standard default values: local preference of 100 and IPv4 unicast is negotiated by
default. This test demonstrates baseline BGP behavior before applying any custom default
parameters.
Scenario
========
.. include:: default/testbgpbasicsessionwithoutdefaultparameters
.. raw:: html
*********************************
Test BGP Default Local Preference
*********************************
Description
===========
This test verifies that ``default local-pref`` sets the baseline local preference value
for routes advertised to iBGP peers. **DUT0** (AS 100) establishes an iBGP session with
**DUT1** (AS 100) and advertises its connected network. With ``default local-pref 150``
configured on DUT0, routes sent to iBGP peers inherit this value. The test verifies that
**DUT1** receives routes from DUT0 with local preference of 150 in its BGP table.
Scenario
========
.. include:: default/testbgpdefaultlocalpreference
.. raw:: html