+C. Pre-requisite for O1 Interface (Required only if run with O1 interface enabled)
+-----------------------------------------------------------------------------------
+1. Setup netconf server
+
+ a. Add new netconf user (login with root user or use sudo and run following script)
+ $cd l2/build/scripts
+ $sudo ./add_netconf_user.sh
+
+ b. Install netconf packages.
+ $chmod +x install_lib_O1.sh
+ $sudo ./install_lib_O1.sh -c
+
+2. Update the configuration according to your setup.
+
+ $cd l2/build/config
+
+ a. Open the startup_config.xml and edit the desired IP and Port for CU, DU and RIC.
+ b. Open the nacm_config.xml and edit the desired user name to provide the access to that user.
+ c. Open the netconf_server_ipv6.xml and edit the desired netconf server configuration.
+ d. Open the oamVesConfig.json and edit the details of OAM VES collector.
+ e. Open the smoVesConfig.json and edit the details of SMO VES collector.
+ f. Open the netconfConfig.json and edit the details of Netopeer server.
+ g. Install the yang modules and load initial configuration
+
+ $cd l2/build/scripts
+ $sudo ./load_yang.sh
+
+ h. Install additional 3GPP yang models.
+
+ Download following 3GPP REL17 YANG models
+ https://forge.3gpp.org/rep/sa5/MnS/tree/Rel17-draft/yang-models
+
+ $cd l2/build/yang
+
+ _3gpp-common-top.yang
+ _3gpp-5g-common-yang-types.yang
+ _3gpp-common-yang-types.yang
+ _3gpp-common-managed-element.yang
+ _3gpp-common-measurements.yang
+ _3gpp-common-subscription-control.yang
+ _3gpp-common-fm.yang
+ _3gpp-common-trace.yang
+ _3gpp-common-managed-function.yang
+ _3gpp-nr-nrm-gnbdufunction.yang
+ _3gpp-nr-nrm-nrcelldu.yang
+ _3gpp-nr-nrm-rrmpolicy.yang
+
+ Note :There are some corrections required in _3gpp-common-trace.yang and _3gpp-common-trace.yang yang model. Please follow these steps.
+
+ $cd l2/build/yang
+ $sed -i -e 's/"IMMEDIATE_MDT"/"IMMEDIATE_MDT_ONLY"/g' _3gpp-common-trace.yang
+ $sed -i -e 's/"TRACE"/"TRACE_ONLY"/g' _3gpp-common-trace.yang
+
+ Install all the downloaded yang models.
+
+ $cd l2/build/yang
+ $sysrepoctl -i _3gpp-common-top.yang
+ $sysrepoctl -i _3gpp-5g-common-yang-types.yang
+ $sysrepoctl -i _3gpp-common-yang-types.yang
+ $sysrepoctl -i _3gpp-common-managed-element.yang
+ $sysrepoctl -i _3gpp-common-measurements.yang
+ $sysrepoctl -i _3gpp-common-subscription-control.yang
+ $sysrepoctl -i _3gpp-common-fm.yang
+ $sysrepoctl -i _3gpp-common-trace.yang
+ $sysrepoctl -i _3gpp-common-managed-function.yang
+ $sysrepoctl -i _3gpp-nr-nrm-gnbdufunction.yang
+ $sysrepoctl -i _3gpp-nr-nrm-nrcelldu.yang
+ $sysrepoctl -i _3gpp-nr-nrm-rrmpolicy.yang
+
+
+3. Start Netopeer2-server:
+ $cd l2/build/scripts
+ $sudo ./netopeer-server.sh start
+
+
+D. How to Clean and Build:
+--------------------------
+1. Build commands:
+ a. odu - Builds all components of ODU
+ b. cu_stub - Builds all CU Stub
+ c. ric_stub - Builds all RIC_Stub
+ d. clean_odu - clean up ODU
+ e. clean_cu - clean up CU Stub
+ f. clean_ric - clean up RIC Stub
+ g. clean_all - cleanup everything
+ h. options:
+ i. MACHINE=BIT64/BIT32 - Specify underlying machine type. Default is BIT32
+ ii. NODE=TEST_STUB - Specify if it is a test node. Mandatory for cu_stub/ric_stub. Must not be used for odu
+ iii. MODE=FDD/TDD - Specify duplex mode. Default is FDD
+ iv. PHY=INTEL_L1 - Specify type of phy. If not specified, PHY stub is used
+ v. PHY_MODE=TIMER - Specify mode of phy. Used only if PHY=INTEL_L1. Default is radio mode
+ vi. O1_ENABLE=YES - Specify if O1 interface is enabled. If not specified, it is disabled
+
+2. Building ODU binary:
+ a. Build folder
+ cd l2/build/odu
+ b. Building ODU binary
+ make odu MACHINE=<refer section D.1.h> MODE=<refer section D.1.h>
+ c. Cleaning ODU binary
+ make clean_odu MACHINE=<refer section D.1.h> MODE=<refer section D.1.h>
+
+3. Building CU Stub binary:
+ a. Build folder
+ cd l2/build/odu
+ b. Building CU Stub binary
+ make cu_stub NODE=<refer section D.1.h> MACHINE=<refer section D.1.h> MODE=<refer section D.1.h>
+ c. Cleaning CU Stub binary
+ make clean_cu NODE=<refer section D.1.h> MACHINE=<refer section D.1.h> MODE=<refer section D.1.h>
+
+4. Building RIC Stub binary:
+ a. Build folder
+ cd l2/build/odu
+ b. Building RIC Stub binary
+ make ric_stub NODE=<refer section D.1.h> MACHINE=<refer section D.1.h> MODE=<refer section D.1.h>
+ c. Cleaning RIC Stub binary
+ make clean_ric NODE=<refer section D.1.h> MACHINE=<refer section D.1.h> MODE=<refer section D.1.h>
+
+5. Cleaning ODU, CU Stub and RIC Stub:
+ make clean_all
+
+
+E. How to Clean and Build with O1 interface enabled (Requires pre-requisite steps in section C)
+------------------------------------------------------------------------------------------------
+