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doc: add BGP VRF use case

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This commit brings some information about BGP VRF case with peering
using multiple VRF instances.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit is contained in:
Philippe Guibert 2018-05-30 15:15:25 +02:00
parent 68542a6da6
commit a35947d06b
1 changed files with 9 additions and 0 deletions
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doc/user/bgp.rst
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@ -1543,6 +1543,15 @@ BPGD supports multiple VRF instances via the *router bgp* command:
VRFNAME is matched against VRFs configured in the kernel. When no *vrf VRFNAME*
is specified, the BGP protocol process belongs to the default VRF.
With VRF, you can isolate networking information. Having BGP VRF allows you to
have several BGP instances on the same system process. This solution solves
scalabiliy issues where the network administrator had previously to run separately
several BGP processes on each namespace. Now, not only BGP VRF solves this, but
also this method applies to both kind of VRFs backend: default VRF from Linux kernel
or network namespaces. Also, having separate BGP instances does not imply that the
AS number has to be different. For internal purposes, it is possible to do iBGP
peering from two differents network namespaces.
BGP routes may be leaked (i.e., copied) between a unicast VRF RIB and the VPN
safi RIB of the default VRF (leaking is also permitted between the unicast RIB
of the default VRF and VPN). A shortcut syntax is also available for