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doc: Updating the BGP document with BGP fast convergence CLI

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Signed-off-by: Prerana G.B <prerana@vmware.com>
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Prerana GB 2021-08-06 18:41:32 +00:00
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doc/user/bgp.rst
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@ -4339,3 +4339,35 @@ Show command json output:
.. [bgp-route-osci-cond] McPherson, D. and Gill, V. and Walton, D., "Border Gateway Protocol (BGP) Persistent Route Oscillation Condition", IETF RFC3345
.. [stable-flexible-ibgp] Flavel, A. and M. Roughan, "Stable and flexible iBGP", ACM SIGCOMM 2009
.. [ibgp-correctness] Griffin, T. and G. Wilfong, "On the correctness of IBGP configuration", ACM SIGCOMM 2002
.. _bgp-fast-convergence:
BGP fast-convergence support
============================
Whenever BGP peer address becomes unreachable we must bring down the BGP
session immediately. Currently only single-hop EBGP sessions are brought
down immediately.IBGP and multi-hop EBGP sessions wait for hold-timer
expiry to bring down the sessions.
This new configuration option helps user to teardown BGP sessions immediately
whenever peer becomes unreachable.
.. clicmd:: bgp fast-convergence
This configuration is available at the bgp level. When enabled, configuration
is applied to all the neighbors configured in that bgp instance.
.. code-block:: frr
router bgp 64496
neighbor 10.0.0.2 remote-as 64496
neighbor fd00::2 remote-as 64496
bgp fast-convergence
!
address-family ipv4 unicast
redistribute static
exit-address-family
!
address-family ipv6 unicast
neighbor fd00::2 activate
exit-address-family