From 5874235fb9e5b5c4c57e1aa4b0db4b310d6e3b23 Mon Sep 17 00:00:00 2001 From: Prerana GB Date: Fri, 6 Aug 2021 18:41:32 +0000 Subject: [PATCH] doc: Updating the BGP document with BGP fast convergence CLI Signed-off-by: Prerana G.B --- doc/user/bgp.rst | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/doc/user/bgp.rst b/doc/user/bgp.rst index 5df149a174..6586b42722 100644 --- a/doc/user/bgp.rst +++ b/doc/user/bgp.rst @@ -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 -- 2.39.5