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Merge pull request #8569 from Jafaral/doc-svi

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doc: add evpn discussion of svi and arp cache
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Donatas Abraitis 2021-04-30 11:20:41 +03:00 committed by GitHub
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doc/user/bgp.rst
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@ -2567,6 +2567,24 @@ address-family:
Ethernet Virtual Network - EVPN
-------------------------------
Note: When using EVPN features and if you have a large number of hosts, make
sure to adjust the size of the arp neighbor cache to avoid neighbor table
overflow and/or excessive garbage collection. On Linux, the size of the table
and garbage collection frequency can be controlled via the following
sysctl configurations:
.. code-block:: shell
net.ipv4.neigh.default.gc_thresh1
net.ipv4.neigh.default.gc_thresh2
net.ipv4.neigh.default.gc_thresh3
net.ipv6.neigh.default.gc_thresh1
net.ipv6.neigh.default.gc_thresh2
net.ipv6.neigh.default.gc_thresh3
For more information, see ``man 7 arp``.
.. _bgp-evpn-advertise-pip:
EVPN advertise-PIP
@ -2592,10 +2610,10 @@ other EVPN routes.
To support this feature there needs to have ability to co-exist a
(system-MAC, system-IP) pair with a (anycast-MAC, anycast-IP) pair with the
ability to terminate VxLAN-encapsulated packets received for either pair on
the same L3VNI (i.e associated VLAN). This capability is need per tenant
the same L3VNI (i.e associated VLAN). This capability is needed per tenant
VRF instance.
To derive the system-MAC and the anycast MAC, there needs to have a
To derive the system-MAC and the anycast MAC, there must be a
separate/additional MAC-VLAN interface corresponding to L3VNI’s SVI.
The SVI interface’s MAC address can be interpreted as system-MAC
and MAC-VLAN interface's MAC as anycast MAC.
@ -2607,7 +2625,7 @@ User has an option to configure the system-IP and/or system-MAC value if the
auto derived value is not preferred.
Note: By default, advertise-pip feature is enabled and user has an option to
disable the feature via configuration CLI. Once the feature is disable under
disable the feature via configuration CLI. Once the feature is disabled under
bgp vrf instance or MAC-VLAN interface is not configured, all the routes follow
the same behavior of using same next-hop and RMAC values.
@ -2616,6 +2634,19 @@ the same behavior of using same next-hop and RMAC values.
Enables or disables advertise-pip feature, specifiy system-IP and/or system-MAC
parameters.
EVPN advertise-svi
^^^^^^^^^^^^^^^^^^
Typically, the SVI IP address is reused on VTEPs across multiple racks. However,
if you have unique SVI IP addresses want those to be reachable you can enable the
advertise-svi-ip option. This option advertises the SVI IP/MAC address as a type-2
route and eliminates the need for any flooding over VXLAN to reach the IP from a
remote VTEP.
.. clicmd:: advertise-svi
Note that you should not enable both the advertise-svi-ip and the advertise-default-gw
at the same time.
EVPN Multihoming
^^^^^^^^^^^^^^^^