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doc: route reflector documentation

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Signed-off-by: Rubens Figueiredo <rubens@bisdn.de>
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Rubens Figueiredo 2019-03-20 14:24:25 +01:00
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doc/user/bgp.rst
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@ -511,8 +511,8 @@ cause may lead to routing instability or oscillation across multiple speakers
in iBGP topologies. This can occur with full-mesh iBGP, but is particularly in iBGP topologies. This can occur with full-mesh iBGP, but is particularly
problematic in non-full-mesh iBGP topologies that further reduce the routing problematic in non-full-mesh iBGP topologies that further reduce the routing
information known to each speaker. This has primarily been documented with iBGP information known to each speaker. This has primarily been documented with iBGP
route-reflection topologies. However, any route-hiding technologies potentially :ref:`route-reflection <bgp-route-reflector>` topologies. However, any
could also exacerbate oscillation with MED. route-hiding technologies potentially could also exacerbate oscillation with MED.
This second issue occurs where speakers each have only a subset of routes, and This second issue occurs where speakers each have only a subset of routes, and
there are cycles in the preferences between different combinations of routes - there are cycles in the preferences between different combinations of routes -
@ -2240,10 +2240,15 @@ Displaying Routes by AS Path
Route Reflector Route Reflector
=============== ===============
.. note:: This documentation is woefully incomplete. BGP routers connected inside the same AS through BGP belong to an internal
BGP session, or IBGP. In order to prevent routing table loops, IBGP does not
advertise IBGP-learned routes to other routers in the same session. As such,
IBGP requires a full mesh of all peers. For large networks, this quickly becomes
unscalable. Introducing route reflectors removes the need for the full-mesh.
.. index:: bgp cluster-id A.B.C.D When route reflectors are configured, these will reflect the routes announced
.. clicmd:: bgp cluster-id A.B.C.D by the peers configured as clients. A route reflector client is configured
with:
.. index:: neighbor PEER route-reflector-client .. index:: neighbor PEER route-reflector-client
.. clicmd:: neighbor PEER route-reflector-client .. clicmd:: neighbor PEER route-reflector-client
@ -2251,6 +2256,13 @@ Route Reflector
.. index:: no neighbor PEER route-reflector-client .. index:: no neighbor PEER route-reflector-client
.. clicmd:: no neighbor PEER route-reflector-client .. clicmd:: no neighbor PEER route-reflector-client
To avoid single points of failure, multiple route reflectors can be configured.
A cluster is a collection of route reflectors and their clients, and is used
by route reflectors to avoid looping.
.. index:: bgp cluster-id A.B.C.D
.. clicmd:: bgp cluster-id A.B.C.D
.. _routing-policy: .. _routing-policy: