.. _example_protocols_bgp_neighbor_address-family_ipv6-unicast_nexthop-self:

############
Nexthop-Self
############

This scenario demonstrates how to configure nexthop-self for IPv6 BGP neighbors.
The nexthop-self command sets the router's own address as the next-hop for routes
advertised to this neighbor. This is commonly used in iBGP to ensure routes learned
from eBGP have a reachable next-hop within the iBGP domain.

.. image:: nexthop-self.svg
  :width: 800

******************************************************************************
Test iBGP IPv6 - Without nexthop-self reflected route has unreachable next-hop
******************************************************************************

Description
===========

Test that without ``nexthop-self``, routes advertised to iBGP peer DUT1 keep the
original next-hop (DUT2: 2001:db8:2::200). Since DUT1 has no route to
2001:db8:2::/64, the next-hop is inaccessible and the route is not usable.

Scenario
========

.. include:: nexthop-self/testibgpipv6-withoutnexthop-selfreflectedroutehasunreachablenext-hop

.. raw:: html

  <hr>

**********************************
Test iBGP IPv6 - With nexthop-self
**********************************

Description
===========

Test to verify that with nexthop-self, the next-hop is changed to DUT0's address.
DUT0 receives route from eBGP peer DUT2 and advertises to iBGP peer DUT1.
With nexthop-self, DUT1 sees DUT0's address as the next-hop.

Scenario
========

.. include:: nexthop-self/testibgpipv6-withnexthop-self

.. raw:: html

  <hr>