01-EPON-OLT Configuration
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Table of Contents
Benefits of the EPON Technology
Data Transmission in an EPON System
Extended OAM Connection Establishment
The S3600 Series EPON OLT Switches and EPON System
Features of the S3600 Series EPON OLT Switches
Three Port Types in an EPON System
S3600 Series EPON OLT Switch Configuration Task List
EPON System Parameter Configuration
Configuring Dynamic Bandwidth Allocation and Related Parameters
Configuring Grant filtering on the OLT port
Displaying and Maintaining OLT Configuration
3 ONU Remote Management Configuration
Binding an ONU with an ONU Port
Configuring the Management VLAN of the ONU
Configuring Traffic Encryption
Displaying and Maintaining ONU Port Configuration
Configuration Examples for ONU Remote Management
Configuration Example for Binding an ONU Port to an ONU
Ethernet Passive Optical Network (EPON) is a Passive Optical Network (PON) which carries Ethernet frames encapsulated in 802.3 standards. It is a combination of the Ethernet technology and the PON technology in compliance with the IEEE 802.3ah standards issued in June, 2004.
A typical EPON system consists of three components: optical line terminal (OLT), optical network unit (ONU), and optical distribution network (ODN), as shown in Figure 1-1.
Figure 1-1 A typical EPON architecture
An OLT, generally an Ethernet switch, router, or multimedia conversion platform, is located at the central office (CO) as a core device of the whole EPON system to provide core data and video-to-telephone network interfaces for EPON and the service provider.
ONUs are used to connect the customer premise equipment, such as PCs, set-top boxes (STBs), and switches. Generally placed at customer's home, corridors, or roadsides, ONUs are mainly responsible for forwarding uplink data sent by customer premise equipment (from ONU to OLT) and selectively receiving downlink broadcasts forwarded by OLTs (from OLT to ONU).
An ODN consists of optical fibers, one or more passive optical splitters (POSs), and other passive optical components. ODNs provide optical signal transmission paths between OLTs and ONUs.
A POS can couple uplink data into a single piece of fiber and distribute downlink data to respective ONUs.
Compared with a traditional Ethernet broadband access network, an EPON network greatly lowers the operation and maintenance costs. This is because, as passive equipment in an EPON system, POSs are energy-saving (requiring no power supply), highly reliable (not affected in case of a power outage), and easy to install, and save optical fiber resources.
Compared with an Ethernet broadband access network, an EPON system provides a longer access transmission distance (up to 20 km, or 12.43 miles) and higher bandwidth (1 Gbps) that can adapt to the service status of the ONUs in real time. Each ONU enjoys dedicated line quality similar to Time Division Multiplexing (TDM) with dedicated uplink bandwidth in the grant cycle assigned to it.
Based on where ONUs are deployed, EPON application mode can be Fiber To The Curb (FFTC), Fiber To The Building (FTTB), and Fiber To The Home (FTTH).
In an FTTC system, ONUs are deployed at roadside or beside the junction boxes of telegraph poles. Usually, twisted-pair copper wires are used to connect the ONUs to each user, and coaxial cables are used to transmit broadband graphic services. One of the main benefits of the FTTC technology is that it allows the existing copper wire infrastructure to continue to be used between the ONUs and customer premises, thus postponing the investments on optical fibers to the home. Currently, the FTTC technology is the most practical and economical Optical Access Network (OAN) solution for providing narrowband services below 2 Mbps. For services integrating narrowband and broadband services, however, FTTC is not the ideal solution.
In an FTTB system, ONUs are deployed within buildings, with the optical fibers led into user homes through ADSL lines, cables, or LANs. Compared with FTTC, FTTB has a higher usage of optical fiber and therefore is more suitable for user communities that are dense or need narrowband/broadband integrated services.
In an FTTH system, ONUs are deployed in user offices or homes to implement a fully transparent optical network, with the ONUs independent of the transmission mode, bandwidth, wavelength, and transmission technology. Therefore, FTTH is ideal for the long term development of optical access networks.
An EPON system uses the single-fiber wavelength division multiplexing (WDM) technology (with downlink central wavelength of 1490 nm and uplink central wavelength of 1310 nm) to implement single-fiber bidirectional transmission, supporting a transmission distance of up to 20 km (12.43 miles).
As shown in Figure 1-2, before an EPON system transmits data, ONU registration (See ONU Registration), extended OAM connection establishment (See Extended OAM Connection Establishment), and bandwidth allocation (See Bandwidth Allocation) are required.
Figure 1-2 Data transmission in an EPON system
Four types of Multipoint Control Protocol (MPCP) messages are used in ONU registration: GATE, REGISTER_REQ, REGISTER, and REGISTER_ACK. Each of these messages contains a time stamp field that records the local clock at the time of packet transmission. There are two types of GATE messages:
l General GATE messages, which allocate bandwidths in unicast mode.
l Discovery GATE messages, which discover ONUs in broadcast mode.
An ONU registration process is as follows:
1) An OLT broadcasts a discovery GATE message to notify the start time and length of the discovery timeslot to all the ONUs.
2) An unregistered ONU responds to the discovery GATE message and modifies its local clock to be consistent with the time stamp contained in the GATE message. When the local clock of the ONU reaches the start time of the discovery timeslot, the ONU waits a random period of delay before sending a REGISTER_REQ message, which contains the MAC address of the ONU and the local time stamp of the ONU when the REGISTER_REQ message is sent.
3) Upon receiving the REGISTER_REQ message from the unregistered ONU, the OLT obtains the ONU's MAC address and ONU-OLT round trip time (RTT) (For the RTT measurement, see Configuring the maximum ONU-OLT RTT. The ONU-OLT RTT is mainly used for the time synchronization between an OLT and ONUs.
4) The OLT parses the received REGISTER_REQ message, and uses the MAC address contained in the message to unicast a REGISTER message to the unregistered ONU. The REGISTER message contains a Logical Link ID (LLID) assigned to the ONU as the unique identifier of the ONU.
5) Right after sending a REGISTER message, the OLT sends a general GATE message to the same ONU.
6) After receiving the REGISTER message and general GATE message, the ONU sends a REGISTER_ACK message in the timeslot assigned in the GATE message to notify the OLT that the REGISTER message is parsed successfully.
7) The ONU registration is complete.
The S3600 series EPON OLT switches support the Operation, Administration and Maintenance (OAM) functions. This enables OLTs to remotely operate, manage, and maintain ONUs.
Extended OAM connection establishment includes OAM capability discovery and exchange of additional information. It is the capability acknowledgement process required before completing other extended OAM functions. Data transmission begins only after the extended OAM connection is established. The process of extended OAM connection establishment is as follows:
1) Standard OAM discovery establishment is complete.
2) The ONU reports the supported Organizationally Unique Identifier (OUI) and extended OAM version number to the OLT.
3) The OLT checks whether the reported OUI and extended OAM version number are in the list of OUIs and extended OAM version numbers supported by the OLT:
l If yes, the extended OAM connection for the ONU is established successfully;
l Otherwise, the extended OAM connection for the ONU cannot be established.
For detailed information about extended OAM, refer to Extended OAM Configuration.
Once the extended OAM connection is established, downlink data transmission can begin. Uplink data transmission can begin only after uplink bandwidth is allocated.
In bandwidth allocation, mainly two types of MPCP messages: GATE and REPORT, are used:
l A GATE message is sent by an OLT to assign a transmission timeslot to an ONU.
l A REPORT message is sent by an ONU to feed back the local status information, such as buffer occupancy, to the OLT, helping the OLT assign timeslots intelligently.
An OLT allocates bandwidth to an ONU as follows:
1) The OLT sends a GATE message to notify the ONU of the timeslot for sending a REPORT message.
2) The ONU sends a REPORT message within the assigned timeslot to report its local status information to the OLT.
3) Upon receiving the REPORT message from the ONU, the OLT, based on the current bandwidth of the system, assigns the ONU a data transmission timeslot, which contains the start time and length for transmitting data by the ONU.
4) The ONU receives the GATE message and waits for the arrival of the start time contained in the GATE message. Once the start time is reached, data transmission begins.
5) The bandwidth allocation is complete.
Downlink data is broadcast to the ONUs, with each ONU receiving only the packets destined to it and discarding other packets, as shown in Figure 1-3.
Figure 1-3 Downlink data transmission in an EPON system
As shown in Figure 1-4, each ONU buffers the data frames received from users and sends the buffered data frames at the full wire-speed (1000 Mbps) once the timeslot for the ONU arrives.
Figure 1-4 Uplink data transmission in an EPON system
The Time Division Multiple Access (TDMA) technology is used to transmit uplink data. This ensures that one optical fiber between the OLT and the POS can transmit data signals from multiple ONUs to the OLT without signal interference.
Downlink data through the OLT is broadcast to each ONU. To prevent illegal interception of user information, each LLID in an EPON system is assigned a unique key, which is updated periodically:
In a key update process, the OLT sends a new key request message to an ONU. Upon receiving the new key request message, the ONU sends a new key notification message back to the OLT.
In a key update process, an OLT uses the key update timer and encryption response timer:
1) OLT key update timer
This timer is used to control the key update cycle. When the key update timer expires, the OLT sends another key request message to start another key update process.
2) OLT encryption response timer
This timer is used to start another key update process when the OLT receives no new key notification message, thus making the key update more reliable.
Upon sending a key update request message, the OLT starts the encryption response timer:
l If the OLT receives a correct new key notification message from an ONU before the timer expires, the OLT enables the new key and cancels the timer.
l If the OLT receives no new key notification message before the timer expires, the OLT considers the key update process has failed, resets the timer, and sends another key update request message. Before the key update succeeds, an ONU keeps using the original key and the OLT reports the key update failure information to the network management system.
l If the OLT receives no new key notification message within the encryption response timer duration after sending three new key request messages consecutively, the OLT sends an alarm to the network management system and the old key continues to be used for downlink data. In this case, you are recommended to adjust the value of the encryption response timer.
The S3600 series EPON OLT switches work as OLT devices in an EPON system. The S3600 series EPON OLT switches have the following features:
l Compliance with EPON interoperation standards: Interoperable with other vendors' ONUs that support China Telecom Technical Requirements for EPON Devices.
l Powerful ONU remote management capabilities: You can centrally manage and configure different services on ONUs and ONU UNI (User Network Interface) ports through OLTs. This greatly lowers subsequent maintenance costs.
l Excellent security protection: OLTs can protect network devices in terms of control, management, and forwarding against illegal access or abnormal traffic.
l Powerful access control list (ACL) and QoS functions: OLTs support standard and extended ACLs, and support traffic policing, traffic shaping, packet priority, multiple queue scheduling mechanisms, multiple congestion avoidance mechanisms, and other QoS assurance functions.
When an S3600 series EPON OLT switch works as an OLT device in an EPON system, the EPON system has three port types: OLT, ONU, and UNI, as shown in Figure 1-5.
Each PON port on an S3600 series EPON OLT switch is an independent OLT device. For an S3600 series EPON OLT switch, a PON port is an OLT port. An OLT port number is in the format EPON card slot number/sub-card slot number/OLT port number, such as OLT 1/0/1, as shown in Figure 1-5.
Each OLT port of an S3600 series EPON OLT switch has 64 logical ONU ports. An ONU port becomes a physical port only after an ONU device is bound with it. The configurations performed in ONU port view take effect on the corresponding ONU device. An ONU port number is in the format EPON card slot number/sub-card slot number/OLT port number: ONU port number, such as ONU 1/0/1:1, as shown in Figure 1-5.
A UNI port is an ONU device port connected to a user. The UNI port number supported by an S3600 series EPON OLT switch is in the range 1 to 80. The actual numbers vary with ONU devices. For example, when the ONU device corresponding to ONU 1/0/1:1 in an EPON system is S3100-16C-EPON-EI, the UNI port number is in the range 1 to 16.
Figure 1-5 shows an EPON system networking diagram, which assumes that only two ONUs are attached to one OLT port and each ONU is connected to only one user.
Based on the three port types (OLT, ONU, and UNI) shown in Figure 1-5, this document details the functions of an S3600 series EPON OLT switch working as an OLT device and the configurations for the functions.
Complete the following tasks to configure an S3600 series EPON OLT switch:
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Task |
Remarks |
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EPON system parameter description and configuration |
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Description and configuration procedure of ONU remote management through OLT |
Complete the following tasks to configure an OLT:
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Task |
Remarks |
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Optional |
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Optional |
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Configuring Dynamic Bandwidth Allocation and Related Parameters |
Optional |
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Optional |
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Optional |
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During ONU registration, an OLT obtains the Round Trip Time (RTT) value of an ONU through the exchange of discovery GATE messages and REGISTER_REQ messages between the OLT and the ONU. By configuring a maximum RTT at the OLT side, you can set the coverage range of the EPON system. An ONU whose RTT is greater than the RTT configured on the OLT cannot be registered.
Setting a short RTT prevents ONUs too far away from the OLT from being registered with the EPON system (a far-away ONU suffers high optical power attenuation). Setting a long RTT can expand the coverage range of the EPON system, allowing as many ONUs as possible to be registered successfully.
The process of RTT measurement is as follows:
1) The OLT sends an ONU a discovery GATE message containing the OLT local time T0, namely, the time stamp in the discovery GATE message is T0.
2) Upon receiving the discovery GATE message, the ONU modifies its local time to be the time stamp T0 in the message and sends a REGISTER_REQ message to the OLT at T1 after a delay (the time stamp of the REGISTER_REQ message is T1).
3) The OLT receives the REGISTER_REQ message at T2.
4) The OLT calculates the ONU RTT by using the formula: RTT=(T2-T0)-(T1-T0)=T2-T1.
5) If the OLT becomes idle at T3 and remains idle for a period of ∆T, the timeslot assigned to the ONU is { T3-RTT, ∆T }. That is, the ONU will start sending data at T3-RTT and send data for a period of ∆T.
Follow these steps to configure EPON system parameters:
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To do… |
Use the command… |
Remarks |
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Enter system view |
system-view |
— |
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Enter OLT port view |
interface olt interface-number |
— |
|
Configure the Maximum ONU-OLT RTT |
max-rtt value |
Optional 13524 TQ by default |
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Exit to system view |
quit |
— |
l It is recommended that you configure the maximum ONU-OLT RTT only when necessary. The relationship between the RTT and the distance (in meters) from the OLT to the ONU can be roughly expressed by the formula: RTT = (Distance + 157)/1.6393.
l The max-rtt command is applicable to unregistered ONUs only.
An Organizationally Unique Identifier (OUI) identifies the vendor of the local device. When you manage the ONU at the OLT side, both the OLT and ONU use the OUI to check whether it can be connected to the peer device. Then, extended OAM is used to encapsulate various operation and conformation information for transmission.
Therefore, before configuring an EPON network, you must configure the OUI and the extended OAM version number.
For detailed information about extended OAM, refer to Ethernet OAM Configuration.
Follow these steps to configure EPON system parameters:
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To do… |
Use the command… |
Remarks |
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Enter system view |
system-view |
— |
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Enter FTTH view |
ftth |
— |
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Configure OUI and extended OAM version number list |
epon-parameter ouilist { oui oui-value oam-version version-value } &<1-9> slot slot-number |
Optional By default, the OUI and OAM version number are 111111 and 1. |
When the OUI and OAM version number list on an EPON device changes due to addition or removal of user-defined list entry, all ONUs under the EPON device will re-register.
Dynamic bandwidth allocation (DBA) is used by an OLT to adjust the uplink bandwidth of individual ONUs in real time according to the traffic status of the ONUs.
BA is implemented through a request-response mechanism:
An OLT obtains the traffic information of ONUs from the bandwidth requests (REPORT messages) received from ONUs, uses a suitable bandwidth allocation algorithm to calculate the bandwidth to be allocated for this cycle within the specified uplink ONU bandwidth range, and notifies the results to the ONUs through bandwidth authorization (GATE messages). This ensures that uplink data sent by ONUs will not conflict with each other.
Compared with static (fixed) bandwidth allocation, DBA is more suitable for bursty IP/Ethernet services. DBA reduces bandwidth wastes and allows for more efficient uplink bandwidth utilization. With DBA adopted, the order and the time for ONUs to send uplink frames are controlled by the OLT.
There are two types of DBA algorithms: internal DBA algorithm and external DBA algorithm.
l The internal DBA algorithm is implemented internally by a chip.
l The external DBA algorithm is implemented through loading an external DBA algorithm file.
Follow these steps to configure dynamic bandwidth allocation and related parameters
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To do... |
Use the command... |
Remarks |
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Enter system view |
system-view |
— |
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Enter OLT port view |
interface olt interface-number |
— |
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Use an external DBA algorithm |
Load the specified external DBA algorithm file |
dba-algorithm update file-url |
Use either internal DBA algorithm or external DBA algorithm. By default, the internal DBA algorithm is used. |
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Use the specified external DBA algorithm |
dba-algorithm enable extdba |
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Use the internal DBA algorithm |
dba-algorithm enable intdba |
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Configure the related parameters of ONU discovery |
dba-parameters { discovery-frequency value | discovery-length value | cycle-length value } * |
Optional By default, the discovery-frequency value is 50, the discovery-length value is 41500 TQ, and the cycle-length value is 65535 TQ. |
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Return to system view |
quit |
— |
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Enter ONU port view |
interface onu interface-number |
— |
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Set the ONU's uplink bandwidth limits and the delay mode of packet forwarding |
upstream-sla { minimum-bandwidth value1 | maximum-bandwidth value2 | delay { low | high } } * |
Optional By default, the minimum bandwidth of an ONU is 2048 kbps, the maximum bandwidth is 23552 kbps, and low delay is adopted. |
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Configure the administration attributes of DBA negotiation |
Configure the number of queue sets supported by ONU Report frames |
dba-report queue-set-number queue-set-number |
Optional By default, ONU Report messages support two queue sets. The default thresholds of queue 4 and queue 5 are 65535, while the default thresholds of other queues are 0. |
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Configure the threshold for a queue |
dba-report queue-id queue-id { active | inactive } threshold threshold-value |
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l 1 time quantum (TQ) is equal to 16 ns, which is the time it takes to transmit two bytes of data at 1 Gbps.
l You can manually load an external DBA algorithm file by using the dba-algorithm update command as needed.
l DBA-related configuration is only recommended for administrators. Improper DBA configuration may terminate all the services.
l H3C ONU Report frames support up to two queue sets.
l The sum of the minimum uplink bandwidths configured for all created ONU ports under an OLT port cannot exceeds 921600 kbps, namely, 900 Mbps.
In an EPON system, uplink transmission adopts the TDMA technology. An OLT assigns each ONU a time slot and each ONU can only send data in its own time slot in sequence. Therefore, the OLT implements strict time synchronization. Within the specified time, the OLT can only receive the packets from the specified ONU. If the time synchronization of an ONU is inaccurate, however, the packets that the OLT receives within a specified time period may be from another ONU. In that case, if grant filtering is enabled on the OLT port, the OLT does not allow the received packets to pass through.
Follow these steps to configure grant filtering on the OLT port:
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To do... |
Use the command... |
Remarks |
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Enter system view |
system-view |
— |
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Enter OLT port view |
interface olt interface-number |
— |
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Enable grant filtering on the OLT port |
grant-filtering enable |
Optional Enabled by default |
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To do... |
Use the command... |
Remarks |
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Display related information of EPON parameters |
display epon-parameter slot slot-number |
Available in FTTH view only |
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Display the information about all the ONUs under an OLT port, ONU port, or the EPON board in the specified slot |
display onuinfo { interface interface-type interface-number | slot slot-number } |
Available in any view |
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Display the information about the legal ONU with the specified MAC address |
display onuinfo mac-address mac-address |
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Display the information about all the silent ONUs connected to the specified OLT port or to the EPON card seated in the specified slot |
display onuinfo silent { interface interface-type interface-number | slot slot-number } |
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Display port version information |
display epon-version interface interface-type interface-number |
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Display port capability information |
display epon-capability interface interface-type interface-number |
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Display the current work mode of a port |
display epon-workmode interface interface-type interface-number |
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Display the statistics on a port |
display epon statistics interface interface-type interface-number |
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Display all the configuration information |
display current-configuration |
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Display the configuration information in the current view |
display this |
l To display the information about an ONU, make sure the ONU is online. You can use the display onuinfo command to check whether an ONU is online.
l Port statistics data includes average error rate of data bits and data frames transmitted between an OLT and the ONUs. For detailed information, refer to the command manual.
Currently, the H3C ONUs for the S3600 series EPON OLT switches fall into three types:
l ET704 series ONUs (For details, see H3C ET704 Series EPON ONUs User Manual.)
l S3100 series ONUs (For details, see H3C S3100 Series Ethernet Switches Quick Start.)
l EC series ONUs (For details, see H3C EC1001 Video Encoder User Manual.)
Support for OLT remote management commands varies with ONUs. For details, see the sections describing the supported configuration functions in ONU device user manuals. The following table lists the ONU remote management functions supported by an S3600 series EPON OLT switch working as an OLT device.
Complete the following tasks to configure an ONU:
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Task |
Remarks |
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Required |
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Optional For H3C ONUs only |
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Optional For H3C ONUs only |
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Optional |
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Configure traffic encryption |
Optional |
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Configure the encryption key |
Optional For H3C ONUs only |
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Configure the key update time and encryption reply timeout time of the encryption |
Optional |
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Optional |
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Optional |
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An OLT supports ONU authentication based on ONU MAC address and denies illegal ONU access to the system. ONU authentication can be implemented by binding the ONU to an ONU port. During the ONU registration:
l The OLT broadcasts a discovery GATE message. After receiving the discovery GATE message, an unregistered ONU sends a REGISTER_REQ message, whose source MAC address is that of the ONU, at the time granted by the GATE message.
l Upon receiving the REGISTER_REQ message, the OLT checks whether the source MAC address contained in the message is bound with the ONU port of the local end. If yes, the ONU passes the authentication and the OLT replies with a REGISTER message; otherwise, the ONU cannot pass the authentication and therefore cannot be registered.
After passing the authentication, the ONU port goes up; that is, the ONU is online.
Before binding an ONU to an ONU port, make sure you have obtained the MAC address of the ONU.
Follow these steps to bind an ONU port to an ONU:
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To do... |
Use the command... |
Remarks |
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Enter system view |
system-view |
— |
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Enter ONU port view |
interface onu interface-number |
— |
|
Bind the current ONU port to an ONU |
bind onuid onuid |
Required |
l An ONU port can only be bound with one ONU MAC address. Conversely, an ONU MAC address can only be bound to one ONU port under one OLT port.
l In fiber backup, an ONU can be bound with two ONU ports under two OLT ports acting as backups for each other. For detailed information about fiber backup, refer to DLDP – Fiber Backup Configuration.
To manage an ONU through Telnet, make sure the ONU is assigned an IP address. Only the VLAN interface corresponding to the management VLAN can be assigned an IP address.
You can designate the management VLAN through the command line. The management VLAN interface of an ONU can obtain an IP address in one of the following two ways:
l Through manual configuration of IP addresses
l Through DHCP (with the ONU as a DHCP client)
Follow these steps to configure the management VLAN of the ONU
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To do... |
Use the command... |
Remarks |
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Enter system view |
system-view |
— |
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Enter ONU port view |
interface onu interface-number |
— |
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Configuring the management VLAN of the ONU |
management-vlan vlan-id |
Optional By default, the management VLAN of the ONU is VLAN 1. |
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Bring up the management VLAN interface |
undo shutdown management-vlan-interface |
Optional By default, a management VLAN interface is down. After the undo shutdown management-vlan-interface command is used: l A management VLAN interface is down if all the Ethernet ports in the management VLAN of the ONU are down. l A management VLAN interface is up if one or more Ethernet ports in the management VLAN of the ONU are up. |
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Configure an IP address for the management VLAN interface |
Manual configuration |
ip address ip-address mask gateway gateway |
Optional (either is required for ET704-A-L) By default: l The ET716/ET724/ET254/ET254-L is configured with IP address 192.168.0.240 and mask 255.255.255.0; l The ET704-B-L/ET704-L is configured with IP address 192.168.0.100 and mask 255.255.255.0; l The ET704-A-L is configured with no IP address. |
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Automatic allocation |
ip address dhcp-alloc |
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The S3100 series ONUs do not support the management VLAN configuration method mentioned above.
You can use an OLT to remotely enable PPPoE+ on an ONU through extended OAM packets.
The Point-to-Point Protocol over Ethernet (PPPoE) technology interconnects large numbers of hosts through Ethernet, allowing the hosts to access the Internet through a far-end access device, and implementing control and accounting functions on each connected host. Operating in the client/server mode, PPPoE encapsulates PPP packets in Ethernet frames, and provides PPP connection over Ethernet.
PPPoE+, also known as PPPoE Intermediate Agent, is designed for broadband users using PPPoE mode authentication. PPPoE+ allows for user port identification by adding user port information into the PPPoE packets.
After PPPoE+ is enabled on an ONU, when a PPPoE client sends a request packet:
l If the request packet contains no PPPoE tag, the ONU adds the tag (containing the UNI port information) to the request packet and forwards the packet to the OLT side.
l If the request packet contains a PPPoE tag, the ONU directly forwards the request packet to the OLT side without adding any tag.
Follow these steps to configure PPPoE+ for an ONU:
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To do... |
Use the command... |
Remarks |
|
Enter system view |
system-view |
— |
|
Enter ONU port view |
interface interface-type interface-number |
— |
|
Enable PPPoE+ for the ONU |
onu-protocol pppoe enable |
Optional PPPoE+ is disabled by default. |
Forward Error Correction (FEC) can implement downlink error correction on the OLT and uplink error correction on the ONU to lower the bit error rate and extend the optical transmission distance. The packets enabled with FEC carry error correction codes. Therefore, the actual uplink bandwidth of the ONU will be less than that configured.
Follow these steps to enable FEC:
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To do... |
Use the command... |
Remarks |
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Enter system view |
system-view |
— |
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Enter ONU port view |
interface onu interface-number |
— |
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Enable the FEC function |
forward-error-correction enable |
Optional Disabled by default |
Complete this task to configure the encryption of the downlink traffic transmitted from the OLT to ONUs, thereby protecting user information against illegal access.
Follow these steps to configure traffic encryption:
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To do... |
Use the command... |
Remarks |
|
Enter system view |
system-view |
— |
|
Enter ONU port view |
interface oun interface-number |
— |
|
Enable traffic encryption |
encrypt enable |
Optional By default, data encryption is enabled for downlink data. |
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Configure an encryption key |
encrypt key key-value |
Optional If no encryption key is configured, the system uses the default encryption key. Currently, the encrypt key command is not supported. |
Complete this task to configuration the update time for the key used for encrypting the downlink traffic transmitted between the OLT and ONUs and the encryption reply timeout time.
Follow these steps to configure the key update time and encryption reply timeout time of the encryption:
|
To do … |
Use the command… |
Remarks |
|
Enter system view |
system-view |
— |
|
Enter FTTH view |
ftth |
— |
|
Configure the key update time and encryption reply timeout time of the encryption |
encryption timer { update update-time | no-reply-timeout timeout }* slot slot-number |
Optional By default, the key update time is 10 seconds and the encryption reply timeout time is 3000 milliseconds. |
The encryption reply timeout time must be less than or equal to the key update time.
After being deregistered, an ONU will try to register again.
Follow these steps to deregister an ONU:
|
To do... |
Use the command... |
Remarks |
|
Enter system view |
system-view |
— |
|
Enter ONU port view |
interface onu interface-number |
— |
|
Deregister the ONU |
deregister onu |
Required |
|
To do... |
Use the command... |
Remarks |
|
Display the ONU registration and deregistration records |
display onu-event interface interface-type interface-number |
Available in any view |
|
Display the global ONU information |
display vendor-specific information |
Available in ONU port view This command displays information normally only when the ONU is online. |
Bind ONU 1/0/1:1 to ONU 1, whose MAC address is 000f-e200-0031, and ONU 1/0/1:2 to ONU 2, whose MAC address is 000f-e200-3749. ONU 1 and ONU 2 have the same extended OAM version of 2.
Figure 3-1 Network diagram for ONU port-to-ONU binding configuration
# Configure the OUI and extended OAM version number list.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] ftth
[Sysname-ftth] epon-parameter ouilist oui 000fe2 oam-version 2 slot 3
[Sysname-ftth] quit
# Create ONU ports ONU 1/0/1:1 and ONU 1/0/1:2. Bind ONU 1/0/1:1 to the ONU 1 and ONU 1/0/1:2 to ONU 2.
[Sysname] interface olt 1/0/1
[Sysname-Olt1/0/1] using onu 1 to 2
[Sysname-Olt1/0/1] quit
[Sysname] interface onu 1/0/1:1
[Sysname-Onu1/0/1:1] bind onuid 000f-e200-0031
[Sysname-Onu1/0/1:1] quit
[Sysname] interface onu 1/0/1:2
[Sysname-Onu1/0/1:2] bind onuid 000f-e200-3749
# When the two ONUs are up, display the binding information of the ONUs.
<Sysname> display onuinfo interface Olt 1/0/1
ONU Mac Address LLID Dist(M) Port Board/Ver Sft/Epm State Aging
000f-e200-0031 1 <50 Onu1/0/1:1 ET704-A-L/B 110/100 Up N/A
000f-e200-3749 2 <50 Onu1/0/1:2 ET704-A-L/B 110/100 Up N/A
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