01-13 Configuring RPR Services in the End-To-End Mode

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13 Configuring RPR Services in the End-to-End Mode

About This Chapter

Using the end-to-end configuration mode, you can quickly create RPR Ethernet services of the

EVPL and EVPLAN types. During the end-to-end configuration, you only need to specify the

source and sink for the service, and the T2000 automatically calculates the route and creates the

service for each NE on the route. The end-to-end configuration mode is also called the trail

management function.

PrerequisiteThe trail management license must be provided for the T2000.

13.1 RPR Ring Network

Resilient packet ring (RPR) is a MAC layer technology designed for a two-fiber ring topology.

RPR is used to transmit data services in an effective and reliable manner.

13.2 Searching for RPR Rings

The T2000 searches for configured RPR ring networks in the T2000 database and manages

discrete RPR ring networks. If all trunk links between adjacent nodes on the ring exist, a RPR

ring network can be found. If one or more links do not exist, it is not a complete RPR ring

network. The nodes and links are displayed as discrete services.

13.3 Configuring RPR Ring Networks

You can configure RPR ring networks.

13.4 Configuring an RPR EVPL Service

By using the trail management function, you can configure an RPR EVPL service directly from

the viewpoint of networking. In this way, the configuration process is simplified.

13.5 Configuring an RPR EVPLAN Service

The RPR EVPLAN trail enables the RPR Ethernet service to be dynamically shared by multiple

points, which meets the dynamic feature of data services and saves bandwidth resources. By

using the trail management function, you can configure an RPR EVPLAN service directly from

the angle of networking. In this way, the configuration process is simplified.

OptiX iManager T2000

Operation Guide for SDH 13 Configuring RPR Services in the End-to-End Mode

Issue 01 (2007-09-15) Huawei Technologies Proprietary 13-1


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Related Tasks

11.20 Configuring Customer Information for a Trail



Operation Guide for SDH

13-2 Huawei Technologies Proprietary Issue 01 (2007-09-15)
http://01-11%20configuring%20sdh%20services%20in%20the%20end-to-end%20mode.pdf/


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13.1 RPR Ring NetworkResilient packet ring (RPR) is a MAC layer technology designed for a two-fiber ring topology.

RPR is used to transmit data services in an effective and reliable manner.

Currently, the three protection modes for an RPR ring network are as follows:

l Wrapping

l Steering

l Wrapping and steering

Wrapping

When a fault occurs on the ring, wrapping is automatically performed on the node near the failure

point. That is, Ring 0 and Ring 1 are connected. Wrapping has a short response time, which

lessens frame loss when a fault occurs, but occupies more bandwidth.Figure 13-1 and Figure 13-2 illustrate the situations before a fiber cut and after wrapping is

performed. The thick line indicates the normal route, and the thin line indicates the protection

route.

Figure 13-1 Traffic flow before a fibre cut

Figure 13-2 Traffic flow after a fibre cut

Steering

When a fault occurs somewhere on the ring, the protection information including the failurepoint and fault type is sent to each node, and the topology also changes correspondingly. The





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source node only needs to send data to the destination node according to the new topology. The

small part of data that has been sent is discarded at the failure point. Steering effectively improves

utilization of ring bandwidth and allows signals to be transmitted on the best route. However, it

takes a longer time to trigger the switching process, and a new route needs to be decided

according to the new topology after the topology becomes stable.

Figure 13-3 and Figure 13-4 illustrate the situations before a fiber cut and after steering is

performed. The thick line indicates the normal route, and the thin line indicates the protection

route.

Figure 13-3 Traffic flow before a fibre cut

Figure 13-4 Traffic flow after a fibre cut

Wrapping and Steering

Wrapping triggers the switching process in a short time. Hence, loss of frame can be effectivelyprevented after a fault occurs. But, more ring bandwidth is required for this protection mode.

Steering effectively improves the utilization of ring bandwidth and allows signals to be

transmitted on the best route. However, it takes a longer time to trigger the switching process,

and a new route needs to be decided according to the new topology after the topology becomes

stable. In this process, wrapping is first performed to avoid loss of packets, and steering is then

performed after the topology becomes stable. In this way, the time during which services are

interrupted is less than or equal to 50ms.

13.2 Searching for RPR Rings

The T2000 searches for configured RPR ring networks in the T2000 database and managesdiscrete RPR ring networks. If all trunk links between adjacent nodes on the ring exist, a RPR






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ring network can be found. If one or more links do not exist, it is not a complete RPR ring

network. The nodes and links are displayed as discrete services.

Prerequisite

l You must be an NM user with "NE and network operator" authority or higher.

l The license for the Ethernet end-to-end management function is provided.

l You must search for SDH trails before you search for RPR rings.

Procedure

Step 1 Choose Trail > Ethernet Trail Search from the Main Menu.

Step 2 Check the Search for RPRcheck box underSelect Search Mode. ClickNext to start searchingfor RPR rings and discrete RPR links.

Step 3 After the search is complete, clickNext. The searched RPR rings and links are shown in theEthernet Trail Search screen.

Step 4 ClickNext, and click the Discrete RPRtab. View the information about nodes and links in thediscrete RPR ring.

Step 5 In the Node tab, right-click a node and choose Delete to delete a discrete RPR node.

Step 6 ClickFinish.

----End

13.3 Configuring RPR Ring NetworksYou can configure RPR ring networks.

1. 13.3.1 Creating an RPR Ring Network

An RPR ring network consists of multiple (2 to 255) RPR nodes and RPR links. The RPR

node consists of east and west VCTRUNKs. In the EMR0 or EGR2 board, the west

VCTRUNK of the RPR node is fixed to VCTRUNK1, and the east is fixed to VCTRUNK2.

When creating an RPR ring network, you need to connect the east VCTRUNK2 of the local

node to the west VCTRUNK1 of the next node.

2. 13.3.2 Modifying RPR Ring Parameters

If the parameters set during the RPR creation are not suitable any more, you can modifythe parameters as required.





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13.3.1 Creating an RPR Ring Network

An RPR ring network consists of multiple (2 to 255) RPR nodes and RPR links. The RPR node

consists of east and west VCTRUNKs. In the EMR0 or EGR2 board, the west VCTRUNK of

the RPR node is fixed to VCTRUNK1, and the east is fixed to VCTRUNK2. When creating anRPR ring network, you need to connect the east VCTRUNK2 of the local node to the west

VCTRUNK1 of the next node.

Prerequisite


l There must be two or more RPR nodes.

l The license for Ethernet end-to-end management must be provided.

Context

Figure 13-5 shows the service route of the RPR ring network.

Figure 13-5 Service route of RPR ring network

NOTE

l The number of nodes on an MSP ring cannot exceed 16.

l In an RPR ring network, only SDH NEs can be selected, and REG and WDM NEs cannot be selected.

Procedure

Step 1 Choose Configuration > RPR> Create from the Main Menu.

Step 2 Enter a name for the RPR ring network.

You can use the default name, for example, RPR1.

Step 3 Select the nodes to be included in the RPR ring network. Double-click an NE in the right-clicktopology pane, and the Add Node dialog box is displayed. Select the RPR board and port and






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clickOK. The RPR node is added to the left-hand list, and the NE is simultaneously displayed

as .

NOTE

To cancel a selected RPR node, right-click the node in list on the left and choose Delete from the shortcut

menu.

CAUTION

In an RPR ring network, the nodes must be added successively in the Ring 0 or Ring 1 direction.

Step 4 Set the name for each node and start the RPR protocol.

Step 5 ClickNext to set the bandwidth and route for the RPR ring network.

Step 6 Set the bandwidth and the level of rate.

Step 7 Select a route strategy.

Option Description

When Automatically Create is selected, The system creates the trunk link automatically.

When Select Existing Link is selected, The Trunk Linkfield displays existing trunk

links that do not carry services and fulfill the

source/sink and bandwidth conditions.

Step 8 Optional: To activate the links, select Activated.





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NOTE

l If you activate the links, the service configuration data of the links is sent to the NE.

l If you do not activate the links, the service configuration data of the links is stored at the NE layer on

the T2000.

Step 9 ClickFinish. A prompt appears telling you that the operation was successful.

----End

13.3.2 Modifying RPR Ring Parameters

If the parameters set during the RPR creation are not suitable any more, you can modify the

parameters as required.

Prerequisite


l The RPR ring must be created.

Procedure

Step 1 Choose Configuration > RPR> Manage from the Main Menu. Click the RPR Parameter tab.

Step 2 Double-click in the Name field and enter a proper name for the RPR ring network.

Step 3 Right-click the RPR network you want in the left-hand pane. Choose Start RPR Protocol orStop RPR Protocol from the shortcut menu to modify the protocol status as needed.

Step 4 Double-click in the Protection Hold-off Time(ms) field and enter a proper value of the

protection hold-off time.NOTE

Protection Hold-off Time (ms): The amount of time to wait before switching takes place, after the protection

condition is detected in an RPR ring. After the protection hold-off time elapses, if the protection condition

persists, the RPR switching is carried out. If the protection condition stops after a timeout, the RPR

switching is not carried out.

Step 5 Click the Protection mode drop-down list and select a protection mode.






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NOTE

l Wrapping: When a fault occurs on the ring, wrapping is performed automatically on the node close

to the failure point. That is, Ring 0 and Ring 1 are connected. Wrapping has a short response time,

which reduces the frame loss when a fault occurs, but it consumes more bandwidth.

l Steering: When a fault occurs on the ring, the protection information including failure point and faulttype is sent to each node, and the topology also correspondingly changes. The source node only needs

to send data to the destination node according to the new topology. The small part of data that has been

sent is discarded at the failure point. Steering protection effectively improves the utilization of ring

bandwidth and allows signals to be transmitted on the best route. However, it takes a longer time to

trigger the switching process, and a new route needs to be decided according to the new topology after

the topology becomes stable.

l Wrap and Steering: Wrapping is first performed to avoid packet loss. Steering is then performed after

the topology becomes stable. In this way, the service interruption duration is less than or equal to 50ms.

Step 6 Click the Revertive drop-down list and select a switching revertive condition.

NOTE

l In the Revertive mode, services revert to the working channel after the working channel returns tonormal.

l In the Non-Revertive mode, services do not revert to the working channel after the working channel

returns to normal.

Step 7 Double-click in the Protection Timing (ms) field, and enter a proper value.

NOTE

l There are fast, slow and WTR timers in the RPR protection protocol. The fast and the slow timers are

used to send TP message, whereas the WTR timer is used for protection switching reversion. The value

specified here is for the slow timer. The value of the fast timer is fixed to 10 ms.

l When the protection information changes, the protection protocol sends eight TP messages by using

the fast timer, to notify other nodes on the ring of the changed protection information. After that, the

protection protocol switches to the slow timer to send TP messages. This reduces the utilization ofbandwidth.

Step 8 Double-click in the Protection wait-to-restore (s) field, and enter a proper value.

NOTE

When a node in SF or SD condition detects that the protection condition no longer exists, it retains the

protection switching state instead of switching back to the normal state immediately. The node is now in

the wait-to-restore (WTR) state and remains in this state for the time period specified in the Protection

wait-to-restore (s) field. After a timeout occurs, the node changes from the WTR state to the normal state,

and the services on the ring resume accordingly.

Step 9 ClickApply.

A prompt appears telling you that the parameters for the RPR ring are modified successfully.

----End

13.4 Configuring an RPR EVPL Service

By using the trail management function, you can configure an RPR EVPL service directly from

the viewpoint of networking. In this way, the configuration process is simplified.

Prerequisite


l The RPR based on trunk link must be configured.





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l The working mode of RPR board external ports must be set.

l The RPR protocol must be started.

ProcedureStep 1 Choose Trail > Ethernet Trail Creation > RPR EVPL Creation from the Main Menu.

Step 2 Set Port Usage Strategy for the source and sink. If the usage strategy is set to Port+VLAN,you need to set the VLAN ID.

NOTE

The Port Usage Strategy parameter has the following two values:

l Port: Use this strategy to configure the transparent transmission of the EVPL service. This strategy

usually applies to point-to-point communication. The VLAN ID cannot be edited.

l Port+VLAN: Use this strategy to configure convergence of the EVPL service. This strategy applies

to point-to-point, point-to-multipoint communication, and communication among multiple points.

Step 3 Set the port of the source and the sink respectively. ClickBrowse and select a board underSlotLayout, a port underRPR Port, and a port underLine Port. ClickOK.

Step 4 Set the Route Strategy parameter for the source and sink. There are three route strategies, whichare Automatically Calculate (802.17), By 0 Ring, and By 1 Ring. ClickNext.






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NOTE

For the N2RPR board, the Route Strategy can be selected. For the N1RPR board, the Route Strategy

cannot be selected.

Step 5 Set the attributes for the source port and the sink port of the RPR EVPL trail, such as TAG,Port Type, Encapsulation Format, Port Enabled, Entry Detection.

Step 6 Optional: Complete the RPR EVPL trail information, such as Name, Customer, Trail ID andRemark.

Step 7 Optional: Set the activation status for the RPR EVPL trail.

NOTE

If you check the Activate the trail check box, the configured trails are immediately delivered to NEs. If

you uncheck the check box, you can activate the trails as required after they are created.

Step 8 ClickFinish. A prompt appears telling you that the operation was successful. ClickClose.

----End

13.5 Configuring an RPR EVPLAN Service

The RPR EVPLAN trail enables the RPR Ethernet service to be dynamically shared by multiple

points, which meets the dynamic feature of data services and saves bandwidth resources. By

using the trail management function, you can configure an RPR EVPLAN service directly from

the angle of networking. In this way, the configuration process is simplified.

Prerequisite


l The RPR based on trunk link must be configured.

l The working mode of RPR board external ports must be set.

l The RPR protocol must be started.

Procedure

Step 1 Choose Trail > Ethernet Trail Creation > RPR EVPLAN Creation from the Main Menu.

Step 2 Double-click the appropriate NE in the Trail View.

Step 3 Select a board underSlot Layout and ports underAvailable Timeslots/Ports, and then click

. ClickOK.





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Step 4 Repeat Steps 2 and 3 to select required nodes for the RPR EVPLAN.

Step 5 ClickNext.

Step 6 Set the attributes for all ports on the RPR EVPLAN trail, such as TAG, Port Enabled, EntryDetection.

Step 7 To create VLAN, clickAdd in VLAN Configuration. The VLAN Configuration for EthernetTrail dialog box is displayed.

Step 8 Enter a value in the VLAN ID field. Select appropriate mounted ports in the Available Mounted

Ports list, and click .

Step 9 ClickOKorApply. Repeat Steps 7 through 9 to create more VLANs as necessary.

Step 10 ClickNext.

Step 11 Optional: Complete the RPR EVPLAN trail information, such as Name, Customer, TrailID and Remark.

Step 12 Optional: Set the activation status for the RPR EVPLAN trail.






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NOTE

If you check the Activate the trail check box, the configured trails are immediately delivered to NEs. If

you uncheck the check box, you can activate the trails as required after they are created.

Step 13 ClickFinish. A prompt appears and clickFinish.

----End





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Documents

01-13 Configuring RPR Services in the End-To-End Mode