doc: add doc for "sid vpn per-vrf export" command

This command adds the documentation for the "sid vpn per-vrf export (1..255)|auto" command to bgpd.

Signed-off-by: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>

diff --git a/doc/user/bgp.rst b/doc/user/bgp.rst
index e32a84f80ce6019fd3bfccc988ddbd2b30aef9dd..4fdb8e089bcaa6c8296eab4952f75e6aed0b70d5 100644 (file)
--- a/doc/user/bgp.rst
+++ b/doc/user/bgp.rst
@@ -2921,6 +2921,23 @@ L3VPN SRv6
    Specify the SRv6 locator to be used for SRv6 L3VPN. The Locator name must
    be set in zebra, but user can set it in any order.
 
+General configuration
+^^^^^^^^^^^^^^^^^^^^^
+
+Configuration of the SRv6 SID used to advertise a L3VPN for both IPv4 and IPv6
+is accomplished via the following command in the context of a VRF:
+
+.. clicmd:: sid vpn per-vrf export (1..255)|auto
+
+   Enables a SRv6 SID to be attached to a route exported from the current
+   unicast VRF to VPN. A single SID is used for both IPv4 and IPv6 address
+   families. If you want to set a SID for only IPv4 address family or IPv6
+   address family, you need to use the command ``sid vpn export (1..255)|auto``
+   in the context of an address-family. If the value specified is ``auto``,
+   the SID value is automatically assigned from a pool maintained by the Zebra
+   daemon. If Zebra is not running, or if this command is not configured, automatic
+   SID assignment will not complete, which will block corresponding route export.
+
 .. _bgp-evpn:
 
 Ethernet Virtual Network - EVPN