.. _example_protocols_bgp_neighbor_disable-connected-check:

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Disable-Connected-Check
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This scenario demonstrates how to configure the disable-connected-check option for an eBGP neighbor.
By default, eBGP requires the neighbor's address to be on a directly connected network. When
disable-connected-check is enabled, the router skips this verification and allows establishing
eBGP sessions with neighbors that are not directly connected, such as loopback-to-loopback peering.

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Test eBGP - Neighbor disable-connected-check allows loopback peering
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Description
===========

Test to verify that disable-connected-check allows an eBGP session to establish when the neighbor
address is not on a directly connected network. DUT0 (AS 10) and DUT1 (AS 20) peer using their
loopback addresses instead of the directly connected interface addresses. With disable-connected-check
enabled, the session establishes successfully and DUT0 receives route 3.3.3.0/24 from DUT1.

Scenario
========

.. include:: disable-connected-check/testebgp-neighbordisable-connected-checkallowsloopbackpeering

.. raw:: html

  <hr>

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Test eBGP - Session fails without disable-connected-check on non-connected peer
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Description
===========

Test to verify that without disable-connected-check, the eBGP session fails to establish when
the neighbor address is not on a directly connected network. Both DUT0 and DUT1 try to peer
using loopback addresses but without disable-connected-check on either side and without static
routes to reach each other's loopbacks, the connected check fails and the session does not
establish. DUT0 does not receive any routes from DUT1.

Scenario
========

.. include:: disable-connected-check/testebgp-sessionfailswithoutdisable-connected-checkonnon-connectedpeer

.. raw:: html

  <hr>