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doc: update VRF support description

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Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>
This commit is contained in:
Igor Ryzhov 2021-05-12 18:49:00 +03:00
parent 60070c3d02
commit 75b8d48236
3 changed files with 9 additions and 17 deletions
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3
doc/user/Useful_Sysctl_Settings.md
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@ -56,7 +56,4 @@ net.ipv6.neigh.default.base_reachable_time_ms=14400000
# Use neigh information on selection of nexthop for multipath hops
net.ipv4.fib_multipath_use_neigh=1
# Allows Apps to Work with VRF
net.ipv4.tcp_l3mdev_accept=1
```

19
doc/user/installation.rst
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@ -541,20 +541,15 @@ Additional kernel modules are also needed to support MPLS forwarding.
:makevar:`VRF forwarding`
General information on Linux VRF support can be found in
https://www.kernel.org/doc/Documentation/networking/vrf.txt. Kernel
support for VRFs was introduced in 4.3 and improved upon through
4.13, which is the version most used in FRR testing (as of June
2018). Additional background on using Linux VRFs and kernel specific
features can be found in
http://schd.ws/hosted_files/ossna2017/fe/vrf-tutorial-oss.pdf.
https://www.kernel.org/doc/Documentation/networking/vrf.txt.
A separate BGP TCP socket is opened per VRF.
Kernel support for VRFs was introduced in 4.3, but there are known issues
in versions up to 4.15 (for IPv4) and 5.0 (for IPv6). The FRR CI system
doesn't perform VRF tests on older kernel versions, and VRFs may not work
on them. If you experience issues with VRF support, you should upgrade your
kernel version.
**Important note** as of June 2018, Kernel versions 4.14-4.18 have a
known bug where VRF-specific TCP sockets are not properly handled. When
running these kernel versions, if unable to establish any VRF BGP
adjacencies, downgrade to 4.13. The issue was fixed in 4.14.57, 4.17.9
and more recent kernel versions.
.. seealso:: :ref:`zebra-vrf`
Building
^^^^^^^^

4
doc/user/zebra.rst
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@ -261,8 +261,6 @@ Link Parameters Commands
Allows nexthop tracking to resolve via the default route. This is useful
when e.g. you want to allow BGP to peer across the default route.
.. _zebra-vrf:
Administrative Distance
=======================
@ -338,6 +336,8 @@ work FRR must use the same metric when issuing the replace command.
Currently FRR only supports Route Replace semantics using the Linux
Kernel.
.. _zebra-vrf:
Virtual Routing and Forwarding
==============================