[sonic-yang-models]: Yang models changes for DHCPv6 Relay.

This commit brings part of
sonic-net#8946.

Signed-off-by: Praveen Chaudhary <[email protected]>
RB=2977661
G=lnos-reviewers
R=pchaudhary,pmao,samaity,zxu
A=

Author: Praveen Chaudhary

src/sonic-yang-models/setup.py

@@ -46,6 +46,7 @@
                          './yang-models/sonic-crm.yang',
                          './yang-models/sonic-device_metadata.yang',
                          './yang-models/sonic-device_neighbor.yang',
+                         './yang-models/sonic-dhcpv6-relay.yang',
                          './yang-models/sonic-extension.yang',
                          './yang-models/sonic-flex_counter.yang',
                          './yang-models/sonic-interface.yang',

src/sonic-yang-models/yang-models/sonic-dhcpv6-relay.yang

@@ -0,0 +1,53 @@
+module sonic-dhcpv6-relay {
+
+	namespace "http://github.com/Azure/sonic-dhcpv6-relay";
+
+	prefix sdhcpv6relay;
+
+	yang-version 1.1;
+
+	import ietf-inet-types {
+		prefix inet;
+	}
+
+	organization "SONiC";
+
+	contact "SONiC";
+
+	description "DHCPv6 Relay yang Module for SONiC OS";
+
+	revision 2021-10-30 {
+		description "First Revision";
+	}
+
+	container sonic-dhcpv6-relay {
+
+		container DHCP_RELAY {
+
+			description "DHCP_RELAY part of config_db.json";
+
+			list DHCP_RELAY_LIST {
+
+				key "name";
+
+				leaf name {
+					type string;
+				}
+
+				leaf-list dhcpv6_servers {
+					description "Configure the dhcp v6 servers";
+					type inet:ipv6-address;
+				}
+
+				leaf rfc6939_support {
+					description "Set rfc6939 for the relay";
+					type boolean;
+				}
+			}
+			/* end of DHCP_RELAY_LIST */
+		}
+		/* end of container DHCP_RELAY */
+	}
+	/* end of container sonic-dhcpv6-relay */
+}
+/* end of module sonic-dhcpv6-relay */

src/sonic-yang-models/yang-models/sonic-vlan.yang

@@ -131,9 +131,15 @@ module sonic-vlan {
 				}
 
 				leaf-list dhcp_servers {
+					description "Configure the dhcp v4 servers";
 					type inet:ip-address;
 				}
 
+				leaf-list dhcpv6_servers {
+					description "Configure the dhcp v6 servers";
+					type inet:ipv6-address;
+				}
+
 				leaf mtu {
 					type uint16 {
 						range 1..9216;