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doc: add notes for ead-es-frag fragmentation

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Config for -
1. Preventing fragmentation via user configured EAD RTs
2. Limiting the number of EVIs per-fragment if EAD fragmentation is needed

Signed-off-by: Anuradha Karuppiah <anuradhak@nvidia.com>
This commit is contained in:
Anuradha Karuppiah 2021-08-13 07:52:07 -07:00 committed by Donald Sharp
parent bb37eabe24
commit 9239606859
1 changed files with 51 additions and 0 deletions
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doc/user/bgp.rst
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@ -2935,6 +2935,8 @@ Example configuration:
exit-address-family
!
.. _bgp-evpn-mh:
EVPN Multihoming
^^^^^^^^^^^^^^^^
@ -3045,6 +3047,55 @@ following zebra command -
.. clicmd:: evpn mh startup-delay (0-3600)
EAD-per-ES fragmentation
""""""""""""""""""""""""
The EAD-per-ES route carries the EVI route targets for all the broadcast
domains associated with the ES. Depending on the EVI scale the EAD-per-ES
route maybe fragmented.
The number of EVIs per-EAD route can be configured via the following
BGP command -
.. index:: [no] ead-es-frag evi-limit(1-1000)
.. clicmd:: [no] ead-es-frag evi-limit(1-1000)
Sample Configuration
^^^^^^^^^^^^^^^^^^^^^
.. code-block:: frr
!
router bgp 5556
!
address-family l2vpn evpn
ead-es-frag evi-limit 200
exit-address-family
!
!
EAD-per-ES route-target
"""""""""""""""""""""""
The EAD-per-ES route by default carries all the EVI route targets. Depending
on EVI scale that can result in route fragmentation. In some cases it maybe
necessary to avoid this fragmentation and that can be done via the following
workaround -
1. Configure a single supplementary BD per-tenant VRF. This SBD needs to
be provisioned on all EVPN PEs associated with the tenant-VRF.
2. Config the SBD's RT as the EAD-per-ES route's export RT.
Sample Configuration
^^^^^^^^^^^^^^^^^^^^^
.. code-block:: frr
!
router bgp 5556
!
address-family l2vpn evpn
ead-es-route-target export 5556:1001
ead-es-route-target export 5556:1004
ead-es-route-target export 5556:1008
exit-address-family
!
Support with VRF network namespace backend
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
It is possible to separate overlay networks contained in VXLAN interfaces from