zebra: T7349: Added FRR ip import-table x feature

docs/configuration/system/ip.rst

@@ -27,6 +27,20 @@
 
    Use this command to use Layer 4 information for IPv4 ECMP hashing.
 
+.. cfgcmd:: set system ip import-table <table-id>
+
+   Use this command to immport the table, by given table id, into the main RIB.
+
+.. cfgcmd:: set system ip import-table <table-id> distance <distance>
+
+   Use this command to override the default distance when importing routers
+   from the alternate table.
+
+.. cfgcmd:: set system ip import-table <table-id> route-map <route-map>
+
+   Use this command to filter routes that are imported into the main table
+   from alternate table using route-map.
+
 Zebra/Kernel route filtering
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
@@ -46,8 +60,8 @@
 Nexthop Tracking
 ^^^^^^^^^^^^^^^^
 
 Nexthop tracking resolve nexthops via the default route by default. This is enabled
 by default for a traditional profile of FRR which we use. It and can be disabled if
 you do not want to e.g. allow BGP to peer across the default route.
 
 .. cfgcmd:: set system ip nht no-resolve-via-default