IBM 6 MPLS User's Manual
Contents
1. MPLS Configuration Attributes olki Attribute Value MPLS Configuration model mpls_config_object EXP lt gt Drop Precedence Standard Mappings EXP lt gt PHB Standard Mappings FEC Specifications EJ LSP Specification File Not Used Traffic Trunk Profiles X a i a I Apply Changes to Setected Objects F Advanced Z a Traffic Trunk Profiles Table Details E Trunk Name 64 Kbps AF1x 64 Kbps AF3x Attribute Traffic Profile A J nm Out of Profile Action 2 Discard Traffic Class Z EF 5 a Details SE Traffic Profile Table lolx Attribute Maximum Bit Rate bits sec 32 000 Average Bit Rate bits sec 32 000 Maximum Burst Size bits 32 000 Details Cancel EXP lt gt Drop Precedence and EXP lt gt PHB These attributes specify how EXP bits in the MPLS shim header are translated into diffserv information at each LSR For E LSPs LSRs determine Per Hop Behavior PHB while on L LSPs they determine Drop Precedence Use the default setting unless you are analyzing the effects of QoS Modeler Release 10 0 SPM 6 5 Specialized Models User Guide 6 MPLS Model User Guide Figure 6 5 Mapping EXP Bits to Drop Precedence and PHB MPLS Configuration Attributes Value name MPLS Configuration model mpls_config_object EXP lt gt Drop Precedence Standard Mappings EXP lt gt PHB FEC Specifications e lt ss ig LS2. e Directionality specifies if an LSP is unidirectional or bidirectional Dynamic LSPs are always unidirectional e LSP Type specifies whether the LSP is of type E LSP or L LSP For E LSP three experimental bits in the shim header carry the Diff Serv information This provides eight different types of service TOS per LSP For L LSP TOS information is contained in the MPLS label and all packets traversing the link are treated equally e Path Details specifies which packets use the LSP and defines how packets are forwarded through the LSP This attribute is automatically configured for dynamic LSPs To configure this attribute for static LSPs select Update LSP Details from the Protocols gt MPLS menu Figure 6 9 Path Details for a Static LSP Path Details Table BEES Interface In Interface Out Label In Label Operation All Not Used 0 2 Push 1 2 3 2 Swap 1 2 2 2 Swap 1 2 2 3 Swap 3 3 1 2 Swap 0 2 Not Used Not Used Pop af nseri Cancel Recovery Parameters specifies recovery parameters that are used to reroute traffic on this LSP if there is a link or node failure along the LSP Modeler Release 10 0 SPM 6 9 6 MPLS Model User Guide Specialized Models User Guide 6 MPLS Model User Guide Figure 6 10 Recovery Parameters Configuration E Recovery Parameters Table Oy x Attribute Retry Timer seconds Number of Attempts Details Eomae Cancel
3. End of Procedure 6 2 SPM 6 14 Modeler Release 10 0 Specialized Models User Guide 6 MPLS Model User Guide Co LS LS nstrained OSPF CSPF is used to implement constraint based routing of Ps You can configure dynamic LSPs to use constraint based routing in the P s TE Parameters attribute by setting the Bandwidth Delay and Hop Count constraints When using TE constraints the model must be configured to use CSPF as follows The CR LDP simulation attribute must be set to CSPF The IP routing protocol must be set to OSPF You can set the dynamic routing protocol to OSPF using the IP Dynamic Routing Protocol simulation attribute With static LSPs you can specify the exact route used by the LSP Static LSPs allow more routing control but offer less resiliency to node and link failures For this reason you should always specify at least one backup route when configuring static LSPs in your network Procedure 6 3 Creating Static LSPs 1 2 Click on the MPLS_E LSP_STATIC object in the MPLS object palette In the project workspace click on the LSP s ingress LER Click on the next link or router in the LSPs route The tooltips indicate which links and routers can be added to the route Hold the cursor over a link or router for details about adding it to the LSP Continue clicking on each link or router in the route until all have been added Right click in the project workspace and select Finish Pat
4. and link models from the standard model library The LER Label Edge Router and LSR Label Switching Router node models in the MPLS object palette are preconfigured to support MPLS However you can configure any of the router models in the standard model library to model LERs and LSRs Figure 6 1 MPLS Object Palette Object Palette MPLS jorx MPLS Configure Palette Ens ethernet2_slip8_ler ethernet2_slip8_Isr Oc3 j E LSP 4 7 E LSP PPP_SONET_OC3 MPLS_E LSP_DYNAMIC MPLS_E LSP_STATIC Global MPLS attributes which are used to configure network wide MPLS parameters are grouped in the MPLS configuration object Router specific MPLS attributes are grouped in the MPLS Parameters attribute on each router They are described in Router Attributes on page SPM 6 6 MPLS Configuration Object Attributes Some of the important MPLS configuration object attributes are described below e FEC Specifications This attribute specifies the Forwarding Equivalence Class FEC parameters used by MPLS in the network FECs classify and group packets so that all packets in a group are forwarded the same way FECs are based on any of the IP header fields ToS Protocol Source Address Range Destination Address Range Source Port and Destination Port can all be used to define a FEC Figure 6 2 Specifying FEC Attributes on page SPM 6 4 shows the attribute sequence for defining an FEC Modeler Release 10 0 SPM 6 3 Spec
5. is IGP CSPF Retry Timer specifies how long an ingress LER waits after detecting a node or link failure before rerouting an LSP that traverses the failed node or link The default value for this attribute is 45 seconds LDP Discovery End Time specifies when LDP discovery ends After this time no more LDP discovery packets are sent through the network This value should occur after the network reaches a final constant state in the simulation since no network topology or device status changes are reflected in the LDP routing tables after LDP Discovery End Time LDP Discovery Start Time specifies when LDP starts sending discovery packets through the network Set this attribute to a value other than Do Not Start to enable LDP LSP Signaling Protocol specifies whether dynamic LSPs are signaled using CR LDP constraint based routed LDP or RSVP The default value is CR LDP SPM 6 8 Modeler Release 10 0 Specialized Models User Guide LSP Attributes Some of the important LSP attributes are described below Most of these attributes can also be configured in the LSP browser which is described in the next section Figure 6 8 Configuring an LSP s Attributes Portland Dallas Attributes Biles model MPLS_E LSP_DYNAMIC Directionality Uni directional LSP Type E LSP Dynamic Path Details J Recovery Parameters Default Setup Parameters Default TE Parameters Default x I Advanced cms C
6. specifies how node and link failures are detected Modeler Release 10 0 SPM 6 7 Specialized Models User Guide 6 MPLS Model User Guide Figure 6 7 Configuring LDP Parameters Las egas Attributes z oj x Type outer Attribute Value aj E LDP Parameters D Discovery Configuration D Subinterface Information RI i E Discovery Configuration H Link Hellos Enabled D J Link Hello Message Interval seco 20 D Link Hello Hold Time seconds 1 000 000 D J Targeted Hellos Disabled D H Targeted Hello Message Interval 0 0 Targeted Hello Hold Time 0 0 L Targeted Hello Receive Filters None ElSession Configuration D J Keepalive Interval No Keepalive Messages D L Hold Time Timeout None ERecovery Configuration D J Link Failure Detection Through Loss of Signal D L Node Failure Detection Immediate El dvertisement Policies J J Export Policies None D L Import Policies None Ellnterface Information D rows 10 Elow 0 HName IFO F Status Disabled Same as Router Level hd I Apply Changes to Selected Objects J Advanced l Find Next Cancel Simulation Attributes The following simulation attributes are available Configure Run Discrete Event Simulation dialog box when using the MPLS model suite CR LDP Routing specifies if CR LDP routing uses CSPF or conventional IGP to determine routes in loosely defined LSPs The default value
7. EC Details for E mail and FTP Traffic FEC Details Table Ce Protocol Source Address Ran Destination Address Source Port Destination Port Unassigned Unassigned Unassigned Unassigned Unassigned Ftp Server Unassigned Unassigned Unassigned Unassigned Email Server e gt e Rows Delete Insent Duplicate Moye Up AT Details Eomae Cancel IL o J Therefore if the IP header of a packet contained either email or FTP it would qualify for the FEC defined in Figure 6 3 and would be sent over the corresponding LSP SPM 6 4 Modeler Release 10 0 Specialized Models User Guide 6 MPLS Model User Guide LSP Specification File This attribute indicates whether the network LSPs should be configured according to the text file specified You can update the text file by clicking OK in the LSP Browser Updating the file recreates the file based on the current network LSP settings including LSPs that might not have been in the original file such as those created manually Traffic Trunk Profiles This attribute specifies out of profile actions and traffic classes for traffic trunks in the network Traffic trunks capture traffic characteristics such as peak rate average rate and average burst size The default Trunk Details setting configures a trunk with a value of 32 000 bits sec for maximum and average bit rate and 32 000 bits for maximum burst size Figure 6 4 Specifying Traffic Trunk Profiles
8. P Specification File Pa Not Used x ai Traffic Trunk Profil is z taffic Trunk Profiles RAA zN ae T Apply Changes to Selected Objects I Advanced lie bee a Befais Eromote Cancel we Berea ee olki Mapping Name Mapping Details Standard Mappings PiS My Mapping 1 w l ee v i me rf ma 2 Rows ete Inset Duplicate Moye Up Move Down Deta 5 Promote Cancel P E CEA Details Table OF x EXP 0 AF11 1 AF21 2 AF22 3 AF31 4 AF32 5 AF4 6 EF 7 EF v 4 gt s Rows Delete Inset Duplicate Move Up Move Down Details Rromate Cancel Kf Router Attributes Some of the important MPLS Parameters attributes set on routers are described below Traffic Mapping Configuration This attribute specifies bindings between FECs and LSPs Each row of the Traffic Mapping Configuration table specifies a distinct traffic engineering TE binding Each TE binding specifies the FEC traffic trunk and LSP that is applied to the label of the incoming packet Only previously defined values appear in the attribute pull down lists If no values appear in the attribute pull down lists verify that you have defined the FECs and traffic trunks in the MPLS Configuration object and that the LSPs appear in the network path browser SPM 6 6 Modeler Release 10 0 Specialized Models User Guide 6 MPLS Model User Guide When an unlabeled packet arrives at an ingress LER the follo
9. Specialized Models User Guide 6 MPLS Model User Guide 6 MPLS Model User Guide Model Features Multi Protocol Label Switching MPLS is a multi layer switching technology that uses labels to determine how packets are forwarded through a network The first part of this document describes key features of the MPLS specialized model and the second part focuses on procedures for configuring MPLS in your network model This section contains a list of the main features available in the Multi Protocol Label Switching model e The MPLS model captures the following protocol behavior Table 6 1 MPLS Model Features Feature Description LSP Label Switched Path configuration e LSPs can be created manually or automatically from traffic conversation pairs LSPs are easily reused in other scenarios or projects by using the LSP import and export features Both dynamic and static LSPs are created using the path object Differential Services DiffServ DiffServ extensions as defined in RFC 2475 are provided e The model enables you to perform QoS quality of service analyses by accounting for different types of service Traffic Engineering Traffic engineered routes are computed using Constrained Shortest Path First CSPF with OSPF or IS IS routing protocols End of Table 6 1 Modeler Release 10 0 SPM 6 1 Specialized Models User Guide 6 MPLS Model User Guide e MPLS m
10. Trunk Profiles The Traffic Trunk Profiles Table appears 3 Change the Rows value to 1 4 Specify a name for the trunk such as Default Traffic Trunk 5 Leave the Trunk Details attribute as Default End of Procedure 6 5 This procedure can be modified to set up separate trunks for traffic of different priorities To do this double click on the Trunk Details attribute and specify the appropriate values for each traffic trunk SPM 6 16 Modeler Release 10 0 Specialized Models User Guide 6 MPLS Model User Guide Creating TE Bindings on LERs After you create the LSPs FECs and traffic trunks you can create TE bindings that govern which packets are sent to which LSPs You do this in the LER s MPLS Parameters Traffic Mapping Configuration attribute Procedure 6 6 Creating a TE Binding 1 Open the LER s Traffic Mapping Configuration attribute dialog box MPLS Parameters Traffic Mapping Configuration Add a row to the table Click in the Interface In column and specify which interfaces the binding applies to in the Interface Binding Specification table To select an interface click in the Apply Binding column for that interface to toggle the value to Yes The interface s you selected appear in the Traffic Mapping Configuration dialog box Note that the interface number for higher layers corresponds to the router s loopback interface Select a FEC for the binding from the FEC pull
11. down menu Select a traffic trunk for the binding from the Traffic Trunk pull down menu Click in the LSP column to specify the primary and backup LSPs End of Procedure 6 6 Modeler Release 10 0 SPM 6 17 Specialized Models User Guide 6 MPLS Model User Guide Exporting LSP Configuration Details for Use in Other Scenarios You can reuse LSPs that you have configured elsewhere by exporting the LSP configuration details to an ASCII file and using this file to create LSPs in the network Procedure 6 7 Exporting LSP Configuration to an ASCII File 1 From the Protocols gt MPLS menu choose Browse Edit LSP Information The LSP Browser appears 2 Click Export to export the LSP configuration for all LSPs to a file The Output File Name dialog box appears 3 Specify a name for the file 4 Click OK to perform the export The file is saved in the primary models directory 5 Click Cancel to close the LSP Browser End of Procedure 6 7 The exported file contains the attribute settings of all LSPs in the network You can use the file as is in other scenarios or you can modify the file to add remove or change LSPs Notice that the LSP configuration file closely resembles the Path Details table for each LSP Procedure 6 8 Using an LSP Configuration File in a Scenario 1 Open the MPLS Configuration object s Attributes dialog box 2 Select the LSP configuration file you wish to import from the LSP Speci
12. e 5 Click the Export To Network button to create the LSPs in the network The LSPs appear in the network End of Procedure 6 1 To create dynamic LSPs manually you must specify the end points ingress and egress LERs of the LSP You can also specify one or more intermediate routers or links along the path When a specific link is selected for the LSP path that hop is marked as strict and the LSP is always set up through that link Use this method to indicate that certain routers or links must be used when routing packets in an LSP If a node or link on a dynamic LSP s route fails the ingress LER automatically tries to find an alternate route However if the failed link or node is marked as strict the entire LSP fails and the ingress LER diverts packets to the backup LSP if one exists Procedure 6 2 Creating Dynamic LSPs Manually 1 Click on the MPLS_E LSP_DYNAMIC object in the MPLS object palette 2 Inthe project workspace click on the LSP s ingress LER 3 Ifthe LSP must use certain routers or links click on the intermediate routers or links that must be used Be sure to click on the objects in the same order that they occur in the LSP 4 Click on the LSP s egress LER 5 Double click in the project workspace to finish drawing the LSP 6 Ifyou are finished creating dynamic LSPs right click in the project workspace and select Abort Path Definition to exit path definition mode Otherwise draw the next dynamic LSP
13. e of an LSR receives labeled packets or packets with matching FEC descriptions it performs no IP processing on the packet Instead the packet is re directed to the mpls_mgr process for MPLS forwarding mpls_mgr uses ILM incoming label map and FTN FEC to NHLFE maps to forward packets mpls_ldp_mgr Implements the LDP control plane in the LDP module of all routers This process is the dispatcher for the mpls_discovery_mgr mpls_session_mgr and mpls_Isp_mgr processes mpls_discovery_mgr Sends periodic broadcast hello messages over UDP to discover MPLS enabled neighbor routers mpls_session_mgr Negotiates opens and maintains TCP sessions to neighboring LDP routers The TCP sessions are used to exchange label maps This process is based on RFC 3036 mpls_Isp_mgr Controls the exchange to label mappings between LDP peers Communication with LDP peers occurs through the session established by the mpls_session_mgr process This process is based on RFC 3036 End of Table 6 4 SPM 6 22 Modeler Release 10 0
14. euing Profiles DSCP Based attribute in the QoS configuration object Finally you must configure the affected routers to use the correct queueing scheme and queuing profile Procedure 6 9 Configuring the Queuing Stream and Profile of a Router 1 Set the Queuing Scheme attribute IP Routing Parameters Interface Information QoS Information 2 Set the Queuing Profile attribute to DSCP Based End of Procedure 6 9 Modeler Release 10 0 SPM 6 19 Specialized Models User Guide 6 MPLS Model User Guide If you change the queuing scheme later make sure you reset the queuing profile because the order of these steps is important Figure 6 15 Configuring QoS on an LER x IP Routing Parameters Table ol x Attribute Value Router ID Auto Assigned Autonomous System Number Auto Assigned Interface Information a a Loopback Interfaces ee Default Route ea Auto Assigned _ Multipath Routes LareShold Unlimited we ee eee Static Boutifig Table None x PE GSS a A ie ar s gt Details l Promote Cancel OK Interface Information Table olx Address Subnet Mask Active Auto Assigned Auto Assigned IP RIP None Disabled N A IF1 Active Auto Assigned Auto Assigned IP RIP None Disabled k N A IF2 Active AutoAssigned Auto Assigned IP RIP None Disabled E N A IF3 Active AutoAssigned Auto Assigned IP RIP None Disabled fJ oe NA IF4 Active AutoAssigned Auto Assigned IP RIP None Disabled bt YA IF5 Active AutoAssigned Au
15. fication File pull down menu 3 Click OK to close the Attributes dialog box The LSPs are added to the scenario By default LSPs from files are not displayed in the network To display these LSPs open the LSP browser and set their Display attributes to Yes End of Procedure 6 8 If you are using an LSP configuration file in your network any changes to LSPs that you make in the LSP browser are subsequently written to the configuration file when you click OK to close the browser SPM 6 18 Modeler Release 10 0 Specialized Models User Guide 6 MPLS Model User Guide Applying QoS to an MPLS Network Model Differential Services DiffServ extensions can be used to apply quality of service constraints to your MPLS network model To do this you must configure QoS do the following e Specify traffic classes in the MPLS configuration object e Adjust DSCP settings in the QoS configuration object e Configure queuing schemes and profiles on the affected routers To use different traffic classes in your MPLS network you must first specify separate traffic trunks for the different classes in the MPLS configuration object To do this use Procedure 6 5 on page SPM 6 16 to create a default traffic trunk However instead of setting the Trunk Details attribute to Default double click to set the traffic profile out of profile actions and traffic class of each trunk To configure quality of service parameters edit the Priority Qu
16. h Definition to finish drawing the LSP If you are finished creating static LSPs right click in the project workspace and select Abort Path Definition Otherwise draw the next static LSP From the Protocols gt MPLS menu choose Update LSP Details to configure label switching information on the LSP s End of Procedure 6 3 Modeler Release 10 0 SPM 6 15 Specialized Models User Guide 6 MPLS Model User Guide Creating FECs and Traffic Trunks The traffic engineering bindings that govern how packets are labeled and forwarded in a network use FECs and traffic trunks to classify packets All of the FECs and traffic trunks in a network are defined in the MPLS configuration object Procedure 6 4 Creating FECs 1 Place an MPLS configuration object in the project workspace and open its Attributes dialog box 2 Double click on the value for FEC Specifications The FEC Specifications Table appears 3 Change the Rows value to the number of FECs you want to create 4 For each FEC assign a name then double click in the Details column to describe the FEC End of Procedure 6 4 To work correctly the model requires that you set up at least one default traffic trunk Additional trunks can be used to handle prioritized flows Procedure 6 5 Creating a Default Traffic Trunk 1 Place an MPLS configuration object in the project workspace and open its Attributes dialog box 2 Double click on the value for Traffic
17. ialized Models User Guide 6 MPLS Model User Guide Figure 6 2 Specifying FEC Attributes MPLS Configuration Attributes Attribute Value MPLS Configuration model mpls_contig_object EXP lt gt Drop Precedence Standard Mappings EXP lt gt PHB Standard Mappings FEC Specifications Ge ice LSP Specification File A Z Not Used hese Traffic Trunk Profiles 2 aid FT OE Sey I Apply Charges to Selected Objects T Advanced be Fi TN has i E FEC Details ia A eel 7 7 Eao o gt whee REO 10 Rows gt Paete Inser Duplicate Move Up Mave Gown om oe e fe p Detak Promote Cancel OK T Bisa ae EE FEC Details Table olx Source Address Range Destination Address Range Source Port Destination Port Unassigned Unassigned Unassigned 192 0 8 2 Unassigned Unassigned oil po Rows Delete Inser Duplicate Move Up Moye Dai Details Emoe Cancel al The FEC Details Table helps define the FEC through a set of match rules which are combinations of TCP UDP and IP header fields FECs are determined by taking a logical AND of the column settings in a row and by taking a logical OR of each of the rows In other words for a packet to qualify for a particular FEC the IP header fields must satisfy every condition of at least one row of the defined FEC For example a FEC that consists only of email and ftp traffic would be specified as shown in Figure 6 3 Figure 6 3 F
18. lay Show All LSPs Displays hidden LSPs in the workspace This operation does not display LSPs which are configured only in the LSP configuration file To display those LSPs use the display functions in the LSP browser Hide All LSPs Hides LSPs displayed in the project workspace from view Clear All LSPs Deletes all LSPs in the network and resets the traffic mapping configuration Deploy MPLS VPNs Configure Interface Status Enables disables MPLS protocol status on either selected or all routers Model User Guide Opens this document End of Table 6 3 Modeler Release 10 0 SPM 6 21 Specialized Models User Guide 6 MPLS Model User Guide Information for OPNET Modeler Users The rest of this document contains information for model developers Such as OPNET Modeler users The following sections describe the topics necessary for understanding the internal details of and interfacing to the MPLS model Model Architecture Each node that can use MPLS has an IP module which contains a dispatcher process that spawns MPLS processes The following table lists the process models used by the MPLS model Table 6 4 MPLS Process Models Process model Description mpls_mgr One instance of this process is spawned by ip_dispatch on each MPLS enabled node in the network It represents the forwarding component of MPLS and the forwarding control plane When the IP modul
19. ng the LSP Browser This column indicates if the attribute values shown are These attributes set the LSP s Path Details and from the GUI or the LSP Setup TE and Recovery specification file Parameters attributes be LSP Browser Name Dynamic DC Access Atlanta Access Dynamic DC Access Dallas_Access Dynamic Atlanta Access Phoenix Dynamic Atlanta Access DC Access Dynamic Atlanta Access Portland Dynamic Dallas_Access Portland Dynamic DC Access Phoenix Dynamic Phoenix DC Access Dynamic Phoenix Portland Dynamic Portland Atlanta Access Export Clicking here toggles the display Clicking OK saves the current settings in settings the workspace is immediately the LSP specification file or creates this refreshed to show or hide the LSPs file if one does not yet exist Modeler Release 10 0 SPM 6 11 Specialized Models User Guide Available Statistics 6 MPLS Model User Guide To analyze MPLS performance you can collect path statistics on end to end delay utilization and the amount of traffic on the LSP These statistics can be collected on a per flow or per LSP basis where flows are individual flows of traffic within an LSP Figure 6 14 Selecting Statistics to Collect Choose Results Dixi E Global Statistics Ej Node Statistics WD Link Statistics Path Statistics Flows E Flow Delay seconds HE Flow Traffic In bits sec HB Flow Traffic In packe
20. odels are implemented based on information available from the following sources Table 6 2 Reference Documents Model Features Document Traffic Engineering MPLS TE RFC 2702 Redauirements for Traffic Engineering Over MPLS FECs RFC 3031 Multiprotocol Label Switching Architecture IGP shortcuts draft hsmit mpls igp spf 00 Label Switched Paths Dynamic LSPs RFC 3031 Multiprotocol Label Switching Static LSPs Architecture LSP routing OSPF TE RFC 2676 QoS Routing and OSPF Extensions IS IS TE Label distribution LDP RFC 3036 LDP Specification CR LDP RFC 3212 Constraint based LSP Setup Using LDP RSVP TE RFC 3209 RSVP TE Extensions to RSVP for LSP Tunnels PP VPNs A framework for layer 3 PP VPNs RFC 2547 BGP MPLS VPNs BGP MPLS VPNs draft ietf ppvpn framework 05 Quality of Service QOS Architecture RFC 2475 An Architecture for Differentiated Services MPLS Support of Differentiated Services RFC 3270 Multi Protocol Label Switching draft ietf mpls diff ext 08 Restoration and Resiliency Fast reroute with bypass tunnels LSP protection with ingress backup draft ietf mpls rsvp lsp fastreroute 00 End of Table 6 2 SPM 6 2 Modeler Release 10 0 Specialized Models User Guide 6 MPLS Model User Guide Node Models Model Attributes The MPLS model suite supports workstation server router
21. ox e Setup Parameters specifies the duration of the LSP Figure 6 11 Setup Parameters Configuration Setup Parameters Table Oy x Attribute Value Start Time seconds 310 End Time seconds End of Simulation H Details Eomae Cancel IL x TE Parameters specifies the traffic engineering constraints used by CR LDP to find a route through the network CR LDP uses Constrained Routing to find the route that is the best fit for the specified constraints This attribute applies to dynamic LSPs only Make sure you account for network bandwidth availability when configuring static LSPs Figure 6 12 TE Parameters Configuration E TE Parameters Table or x Bandwidth 20 000 000 Delay No Constraints Hop Count Unlimited Hops Eomae Cancel ox SPM 6 10 Modeler Release 10 0 Specialized Models User Guide 6 MPLS Model User Guide LSP Browser After you create the LSPs in the network you may want to edit or view the default settings You do this in the LSP browser which you can access from the Protocols gt MPLS gt Browse Edit LSP Information menu item The browser enables you to Set the hop type of LERs Set the start and end times for the LSP Set threshold values for bandwidth delay and hop counts in the LSP Hide some or all of the LSPs from view in the Project Editor workspace Export LSP configuration details to a file Figure 6 13 Usi
22. se path objects in OPNET To create LSPs use the standard procedure for creating paths as described in the Building Models chapter of the User Guide manual Guru product documentation or the Communication Mechanisms chapter of the Modeling Concepts manual Modeler documentation You can create dynamic LSPs automatically using the Create LSPs From Traffic Conversation Pairs utility or manually using the standard procedure for creating path objects The Create LSPs From Traffic Conversation Pairs utility creates LSPs quickly based on some or all of the traffic conversation pairs in the network Procedure 6 1 Creating Dynamic LSPs from Demands 1 From the Protocols gt MPLS menu choose Configure LSPs from Demands The Assign IP Addresses dialog box appears Modeler Release 10 0 SPM 6 13 Specialized Models User Guide 6 MPLS Model User Guide 2 If you have not assigned IP addresses to all connected interfaces in the network click the Perform Auto Assignment button Otherwise click the Skip Auto Assignment button The MPLS Configuration dialog box opens This box shows all the traffic pairs configured in the network with suggested configuration for LSP configuration 3 Inthe MPLS LSP Configuration dialog box specify which traffic conversation pairs should not generate LSPs by changing their Create LSP fields to No 4 Verify that the LSP configuration is correct for each LSP you would like to creat
23. to Assigned IP RIP None Disabled None NAN IF6 Active AutoAssigned Auto Assigned IP RIP None Disabted None NAA x gt NS gt fo Aga 10 R Delete Insert Duplicate Moye Up MC Bre se ma Dupes isiu l QoS Information Table _ Oy x Details Promote Attribute Value Incoming CAR Profile None Outgoing CAR Profile None Always set the Queuing a Size Bytes MBytes Scheme before setting the Queuing Profile Queuing Scheme WFO Queuing Profile PHB Based Details Promote SPM 6 20 Modeler Release 10 0 Specialized Models User Guide 6 MPLS Model User Guide MPLS Menu Operations The Protocols gt MPLS menu enables you to configure edit and display MPLS features in the network topology With the MPLS menu operations you to streamline the MPLS configuration process Table 6 3 lists the operations available from the Project Editor s Protocols gt MPLS menu Table 6 3 MPLS Menu Summary Menu Item Description Update LSP Details Updates all static LSPs with label switching information Configure LSPs from Demands Creates dynamic LSPs between all traffic flows Browse Edit LSP Information Opens the LSP browser Import LSP Information Imports LSP information from files Display LSP Routes Displays the routes chosen by CR LDP Does not display link statistic information Hide all LSP Routes Hides LSP route disp
24. ts sec TM Flow Traffic Out bits sec UM Flow Traffic Out packets sec m LSP J Delay seconds HE Traffic In bits sec HI Traffic In packets sec HI Traffic Out bits sec OEE Traffic Out packets sec gt When analyzing your MPLS network you may also want to look at the routes used for the LSPs You can do this by selecting the Protocols gt MPLS gt Display LSP Routes menu item SPM 6 12 Modeler Release 10 0 Specialized Models User Guide 6 MPLS Model User Guide Configuring MPLS in a Network Creating LSPs Configuring MPLS in a network is a three step process Before you can runa simulation using MPLS you must 1 Create LSPs in the network topology 2 Create FECs and traffic trunks in the MPLS Configuration object 3 Configure LERs to direct packets into the appropriate LSPs After this basic configuration is in place you can add QoS differentiated services DiffServ constraints or traffic shaping parameters After you create your network topology you can add LSPs to the network There are three methods of adding LSPs to your network e From traffic conversation pairs e By drawing the LSPs in the Project Editor workspace e From text files The Update LSP Details operation creates traffic profiles and forward equivalence classes FECs for the LSPs which you can modify later as you fine tune your model The model supports both static and dynamic LSPs using the strict and loo
25. wing sequence occurs to determine the correct label for the packet 1 The TE binding is selected based on the packet FEC and the incoming interface 2 The packet is checked to make sure that its traffic characteristics conform to those specified for the TE binding s traffic trunk 3 The packet is labeled for and sent through the primary LSP specified for the TE binding Figure 6 6 Configuring TE Bindings E Traffic Engineering Configuration T able Traffic Trunk FTP Traffic 64 Kbps AF3x D J FTP Traffic 64 Kbps AFlx z 5 gt ee eee eae eer Duplicate Value Attribute Primary LSPs pins Backup LSPs Poa Not Use 1u This weight attribute configuration uses LER2 LER5 75 of the time and LER2 site9 LSP Name LER 2 LER 5 30 LER 2 site 9 10 2 Rows Delete Insert Details Duplicate EXP lt gt Drop Precedence and EXP lt gt PHB These attributes specify which mappings defined in the MPLS configuration object are used by the router LDP Parameters specifies Label Distribution Protocol parameters used by the LSR LDP Parameters is a compound attribute composed of the following sub attributes Discovery Configuration specifies Hello message parameters needed to learn of neighboring routers Session Configuration specifies Keep alive message parameters used to establish LDP sessions Recovery Configuration
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