OpenOLT agent

The OpenOLT agent runs on white box Optical Line Terminals (OLTs) and provides a gRPC-based management and control interface to OLTs.

The OpenOLT agent is used by VOLTHA through the OpenOLT adapter.

OpenOLT agent uses Broadcom’s BAL (Broadband Adaptation Layer) software for interfacing with the Maple/Qumran chipsets in OLTs such as the Edgecore/Accton ASXvOLT16.

  +---------------------------------+
  |             VOLTHA              |
  |                                 |
  |       +------------------+      |
  |       | OpenOLT adapter  |      |
  +-------+--------+---------+------+
                   |
  OpenOLT gRPC API |
                   |
+--------------------- ---------------+
|                  |                  |
|         +------------------+        |
|         |   OpenOLT agent  |        |
|         +--------+---------+        |
|                  |                  |
| Vendor specific  | (e.g. Broadcom   |
|       API        |     BAL API      |
|                  |                  |
|         +------------------+        |
|         | Vendor SoC/FPGA  |        |
|         |(e.g Maple/Qumran)|        |
|         +------------------+        |
|                                     |
|           White box OLT             |
+-------------------------------------+

Hardware requirements

A list of tested devices and optics can be found in the CORD hardware requirements guide, in the R-CORD access equipment and optics section.

Pre-built debian packages of OpenOLT agent for Accton/Edgecore ASFVOLT16/ASGvOLT64

Accton/Edgecore makes available pre-built debian packages of OpenOLT agent to their customers. Get access credentials for edgecore.quickconnect.to and then login and navigate to File_Station -> EdgecoreNAS, and then the folder /ASXvOLT16/OpenOLT_Agent/From_ONF_Distribution/ and pick the right version of .deb package required for your testing.

voltha-2.6/openolt_<OPENOLTDEVICE>-2.6.0-<GIT Commit ID>.deb is the latest version of package with support for BAL v3.4.9.6 .

The pre-built debian packages have been tested on Open Networking Linux (ONL) version 4.14. The ONL Installer required for voltha-2.6/openolt_<OPENOLTDEVICE>-2.6.0-<GIT Commit ID>.deb is also available at in the same path, i.e., voltha-2.6/.

Install OpenOLT

Copy the debian package to the OLT. For example:

scp openolt.deb root@10.6.0.201:~/.

Install the openolt.deb package using dpkg:

dpkg -i openolt_<OPENOLTDEVICE>-2.6.0-<GIT Commit ID>.deb

The ONL version required for BAL v3.4.9.6 is ONL 4.14.151-OpenNetworkLinux. This will be built as part of build procedure described Build OpenOLT section.

Run OpenOLT as a Linux service

Rebooting the OLT (after the installation) will start dev_mgmt_daemon and openolt as system services:

reboot

The services can also be stopped/started manually:

service dev_mgmt_daemon stop
service openolt stop
service dev_mgmt_daemon start
service openolt start

Check the status of the services:

service dev_mgmt_daemon status
service openolt status

Run OpenOLT in foreground for development and debugging

Running the dev_mgmt_daemon and/or openolt services in the foreground is useful for development and debugging. Make sure to first stop the services if they are running in background.

service dev_mgmt_daemon stop
service openolt stop

Open a terminal and run the Broadcom BAL software (dev_mgmt_daemon):

cd /broadcom
./dev_mgmt_daemon -d -pcie

Perform dev_mgmt_daemon and change NNI port speed:

  • 100G port change to 40Gbps speed

cd /broadcom
./dev_mgmt_daemon -d -pcie -port_100g_speed 40000
  • 100G port change to 10Gbps speed (use Break-out cable)

cd /broadcom
./dev_mgmt_daemon -d -pcie -port_100g_speed 10000 topology_config_file ./topology_config_16_ports.ini
  • 25G port change to 20Gbps speed (Accton/Edgecore ASGvOLT64)

cd /broadcom
./dev_mgmt_daemon -d -pcie -port_25g_speed 20000
  • 25G port change to 10Gbps speed (Accton/Edgecore ASGvOLT64)

cd /broadcom
./dev_mgmt_daemon -d -pcie -port_25g_speed 10000
  • 25G port change to 1Gbps speed (Accton/Edgecore ASGvOLT64)

cd /broadcom
./dev_mgmt_daemon -d -pcie -port_25g_speed 1000

The dev_mgmt_daemon executable presents the CLI for Broadcom’s BAL when run in the foreground which is useful for debugging.

While the first executable still runs (even in background), open another terminal and run openolt:

cd /broadcom
./openolt --interface <interface-name> (or)
./openolt --intf <interface-name>

NOTE:

  • In the commands above, you should specify OLT management interface name or inband interface name if OLT is used in inband mode. Openolt gRPC server will start listening on given interface’s IP address. If no interface specified gRPC server will listen on “0.0.0.0:9191” which will accpet requests from any of the interfaces present in OLT.

  • The two executables will remain open in the terminals, unless they are put in background.

Inband ONL Note

  • Inband ONL image built by packaging Openolt debian package and some startup scripts. The startup scripts serve to enable inband channels, create inband tagged interfaces, install Openolt debian package and run dev_mgmt_daemon and Openolt services.

  • Startup script named “start_inband_oltservices.sh” will be executed in background after ONL installation. Script execution could be watched in a log file located in /var/log/startup.log.

  • Follow the procedure specified below in Build OpenOLT section to build integrated Inband ONL image.

Connect from VOLTHA

At the VOLTHA CLI, preprovision and enable the OLT:

(voltha) preprovision_olt -t openolt -H YOUR_OLT_MGMT_IP:9191
(voltha) enable

Additional notes

  • 9191 is the TCP port that the OpenOLT agent uses for its gRPC channel.

  • In the commands above, you should use OLT inband interface IP address if OLT is used in inband mode, otherwise substitute all its occurrences with the management IP of your OLT.

Log Collection for whitebox OLT Device

To collect logs from openolt, dev_mgmt_daemon and syslog processes install td-agent(fluentd variant) directly on OLT device which will capture and transmits the logs to elasticsearch pod running in voltha cluster.

Prerequisite:

OLT should have ntp installed to ensure it has correct time(which is used by td-agent for generated events)

apt-get install ntp

Installation of td-agent deb package:

  • Download the deb package for td-agent

wget http://packages.treasuredata.com.s3.amazonaws.com/3/ubuntu/xenial/pool/contrib/t/td-agent/td-agent_3.8.0-0_amd64.deb
  • Install td-agent on device

dpkg -i td-agent_3.8.0-0_amd64.deb

Post Installation:

We have created custom td-agent configuration file to handle format of involved log files using right input plugins and elasticsearch output plugin.

Copy the custom config file from here in the ~ directory of the olt. Then into the /etc folder in order for the agent to pick it up.

cp td-agent.conf /etc/td-agent.conf
  • Set elasticsearch host and port in /etc/td-agent.conf

  • Restart the td-agent service

service td-agent restart

Need to redirect syslog to default port of fluentd syslog plugin.

  • Add “. @127.0.0.1:42185” to /etc/rsyslog.conf

  • Restart syslog using

/etc/init.d/rsyslog restart

Note:

To enable TLS encryption features with td-agent look at this google doc

Build OpenOLT Agent

Refer BUILDING guide for details on how to build openolt agent.

FAQ

The information here may be specific to specific OLT and ONU hardware such as Edgecore ASFVOLT16 OLT and Broadcom based ONUs.

How to change speed of ASFVOLT16 NNI interface?

Auto-negotiation on the NNI (Network to Network Interface) uplink ports is not tested.

By default, the OpenOLT agent sets the speed of the NNI interfaces to 100G. To downgrade the network interface speed to 40G, add the following lines at the end of the /broadcom/qax.soc configuration file.

port ce128 sp=40000

A restart of the dev_mgmt_daemon and openolt services is required after making this change.

Why does the Broadcom ONU not forward eapol packets?

The firmware on the ONU is likely not setup to forward 802.1x EAPOL traffic on the Linux bridge. Drop down to the shell in the Broadcom ONU’s console and configure the Linux bridge to forward 802.1x.

> sh
# echo 8 > /sys/class/net/bronu513/bridge/group_fwd_mask

Version 1.7 of VOLTHA has a known issue where the ONU is only able to pass EAPOL packets from a specific LAN port (e.g. LAN port 1 on ALPHA ONUs)

How do I check packet counters on the ONU?

LAN port packet counters:

bs /b/e port/index=lan{0,1,2,3,4,5,6}

WAN port packet counters:

bs /b/e port/index=wan0

How to get access to MAPLE CLI on OLT box

To get access to the BCM.0> maple console, SSH into the OLT and then execute:

cd /broadcom
./example_user_appl

How do I check packet counters on the OLT’s PON interface?

Following is an example of retrieving the interface description for PON intf_id 0

(TODO: document PON interface numbering for Edgecore OLT).

BCM.0> a/t clear=no object=pon_interface sub=itu_pon_stats pon_ni=0
[-- API Start: bcmolt_stat_get --]
[-- API Message Data --]
object: pon_interface- PON Network Interface.
get stat subgroup: itu_pon_stats-ITU PON Statistics. loid: 0 response: OK
key={pon_ni=0}
data={
  fec_codewords=0
  bip_units=0
  bip_errors=0
  rx_gem=0
  rx_gem_dropped=0
  rx_gem_idle=0
  rx_gem_corrected=0
  rx_crc_error=0
  rx_fragment_error=0
  rx_packets_dropped=0
  rx_dropped_too_short=0
  rx_dropped_too_long=0
  rx_key_error=0
  rx_cpu_omci_packets_dropped=0
  tx_ploams=157
  rx_ploams_dropped=0
  rx_allocations_valid=0
  rx_allocations_invalid=0
  rx_allocations_disabled=0
  rx_ploams=39
  rx_ploams_non_idle=39
  rx_ploams_error=0
  rx_cpu=0
  rx_omci=0
  rx_omci_packets_crc_error=0
  tx_packets=0
  tx_gem=0
  tx_cpu=0
  tx_omci=0
  tx_dropped_illegal_length=0
  tx_dropped_tpid_miss=0
  tx_dropped_vid_miss=0
  tx_dropped_total=0
  rx_xgtc_headers=39
  rx_xgtc_corrected=0
  rx_xgtc_uncorrected=0
  fec_codewords_uncorrected=0
  rx_fragments_errors=0
}
[-- API Complete: 0 (OK) --]

How do I check packet counters on the OLT’s NNI interface?

Following command retrieves NNI intf_id 0:

BCM.0> a/t clear=no object=nni_interface sub=stats id=0
[-- API Start: bcmolt_stat_get --]
[-- API Message Data --]
object: nni_interface- nni_interface.
get stat subgroup: stats-NNI Interface Statistics. loid: 0 response: OK
key={id=0}
data={
  rx_bytes=40023
  rx_packets=283
  rx_ucast_packets=0
  rx_mcast_packets=283
  rx_bcast_packets=0
  rx_error_packets=0
  rx_unknown_protos=0
  tx_bytes=0
  tx_packets=0
  tx_ucast_packets=0
  tx_mcast_packets=0
  tx_bcast_packets=0
  tx_error_packets=0
}
[-- API Complete: 0 (OK) --]

How do I list flows installed in the OLT?

Following command lists the flows installed on the OLT.

BCM.0> a/m max_msgs=100 filter_invert=no object=flow

How do I access device CLI when running dev_mgmt_daemon and openolt agent binary as services?

Navigate to /opt/bcm68620 and execute the command /broadcom/dev_mgmt_attach to access the QAX diagnostic shell. If you are not able to access the shell, you need to recompile the BAL SDK with SW_UTIL_SHELL=y option set.

Known Issues

  • The Minimum BW that should be configured for ITU PON Alloc Object has changed from 16Kbps to 32Kbps from BAL3.1 to BAL3.2 release if you are using ALPHA ONUs. As per BAL3.x documents, when FEC is disabled, the minimum BW is 16Kbps on the ITU PON Alloc Object. This seems to be a discrepancy on the ALPHA ONU. So, ensure that cir + eir value is greater than equal to 32000 for XGSPON use case for ALPHA ONU.