.. _example_protocols_bgp_parameters_log-neighbor-changes:

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Log-Neighbor-Changes
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Scenario to verify BGP **log-neighbor-changes** parameter configuration.

By default, BGP does not log neighbor state changes to syslog. The
``log-neighbor-changes`` parameter enables logging of BGP neighbor state transitions
(up/down) and the reason for the change. This is useful for troubleshooting and
monitoring BGP session stability.

In this test, **DUT0** (AS 20) establishes an iBGP session with **DUT1** (AS 20)
with ``log-neighbor-changes`` enabled. After the session is established, a shutdown
is applied to trigger a state change. The test then verifies that the neighbor
change event appears in the system logs.

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Test BGP Log Neighbor Changes
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Description
===========

This test verifies that ``log-neighbor-changes`` causes BGP to log neighbor
state transitions to syslog. After establishing an iBGP session with the
parameter enabled, a shutdown is applied to the neighbor on **DUT0**, and the
system logs are checked for the neighbor change event.

Scenario
========

.. include:: log-neighbor-changes/testbgplogneighborchanges

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