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NE40E V800R010C10SPC500 Configuration Guide - IP Routing 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Routing
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Configuring IS-IS IPv4 MT to Isolate Multicast Services from Unicast Services

Configuring IS-IS IPv4 MT to Isolate Multicast Services from Unicast Services

On an IS-IS IPv4 network, IS-IS multi-topology (MT) improves usage of network resources by allowing services to run in multiple logical topologies.

Usage Scenario

On a traditional IP network, only one unicast forwarding table is available on the forwarding plane because only one unicast topology exists, which forces services transmitted from one router to the same destination address to share the same next hop, and various end-to-end services such as voice and data services, to share the same physical links. As a result, some links may become heavily congested while others remain relatively idle. In addition, QoS requirements vary based on services. The traditional unicast topology cannot meet various QoS requirements.

IS-IS MT allows multiple separate logical topologies to be deployed in an IS-IS autonomous system (AS). Separate multicast topologies can be set up for multicast services, and this configuration isolates multicast topologies from unicast topologies.

IS-IS MT allows users to configure the network flexibly, reducing network construction cost.

To configure IS-IS MT, perform the following steps. First, associate an IS-IS process with topology instances so that the SPF calculation can be performed for the topology instances in the IS-IS process. Second, associate a specified interface with the topology instances so that every link can participate in the SPF calculation.

Pre-configuration Tasks

Before configuring IS-IS MT to isolate IPv4 multicast services from IPv4 unicast services, complete the following tasks:

Configuration Procedures

Figure 9-2 Configuring IS-IS MT to isolate IPv4 multicast services from IPv4 unicast services

Enabling IPv4 MT for an IS-IS Process

Based on service requirements and the network plan, an IS-IS process can be associated with various topology instances so that multiple logical topologies are deployed in an IS-IS AS.

Context

You can associate an IS-IS process with unicast or multicast topology instances as required so that the SPF calculation can be performed for the topology instances in the IS-IS process. Then, you can configure parameters, such as the interface cost and protocol priority for the topology instances.

The configuration in an IS-IS topology instance view takes effect only on the topology instance. Therefore, you can configure different features and parameters for different topology instances as required.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ip topology topology-name

    An IPv4 topology instance is configured.

  3. Run isis [ process-id ]

    The IS-IS view is displayed.

  4. Run cost-style { wide | wide-compatible }

    The cost style of packets sent and received by the router is set to wide or wide-compatible.

    NOTE:
    Go to Step 5 or Step 6 as required.
    • If the router supports only unicast services, go to Step 5.
    • If the router supports only multicast services, go to Step 6.
    • If the router supports both unicast and multicast services, perform the following steps.

  5. Run topology topology-name topology-id topology-id

    The IS-IS process is associated with a specified unicast topology instance, and the IS-IS unicast topology instance view is displayed.

  6. Run topology multicast topology-id multicast

    The IS-IS process is associated with a specified multicast topology instance, and the IS-IS multicast topology instance view is displayed.

  7. (Optional) Configure IS-IS features for IPv4 topology instances using the following commands:

    • To set the priority of IS-IS, run the preference command.

    • To enable an IS-IS device to generate a default route, run the default-route-advertise command.

    • To enable an IS-IS device to import routes from other routing protocols in the IS-IS view, run the import-route command.

    • To control IS-IS route leaking from a Level-1 area to a Level-2 area, run the import-route isis level-1 into level-2 command.

    • To control IS-IS route leaking from a Level-2 area to a Level-1 area, run the import-route isis level-2 into level-1 command.

    • To enable IS-IS summarization, run the summary command.

    • To configure a link cost for all interfaces of a specified IS-IS process, run the circuit-cost { cost | maximum } [ level-1 | level-2 ] command.
    • To enable IS-IS to automatically calculate the interface cost according to the interface bandwidth, run the auto-cost enable [ compatible ] command.
    • To set a bandwidth reference value used for automatic interface cost calculation, run the bandwidth-reference value command.
    • To set the maximum number of equal-cost routes for load balancing, run the maximum load-balancing number command.

  8. Run commit

    The configuration is committed.

Enabling MT for IPv4 an IS-IS Interface

After IS-IS MT is enabled, associate a specified interface with MT instances so that specified links can participate in the SPF calculation for the topology instances.

Context

Various topology instances can be associated with one interface so that specified links of the interface can participate in the SPF calculation for the topology instances.

The following parameters can be configured for an interface in different topology instances:
  • Cost of the interface in each topology instance

  • Administrative tag of the interface in each topology instance

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The physical interface view is displayed.

  3. Run ip topology topology-name enable

    An IPv4 topology instance is enabled for the interface.

  4. Run isis topology topology-name

    The interface is associated with the IS-IS IPv4 topology instance.

    NOTE:

    If You want to associate an interface with multiple IPv4 topology instances, repeat this step and specify different topology names.

  5. (Optional) Run isis topology topology-name cost cost [ level-1 | level-2 ]

    A cost is configured for the interface in the IS-IS topology instance.

    A cost change on an interface will trigger route reselection. Therefore, change the cost during network planning.

  6. (Optional) Run isis topology topology-name tag-value tag [ level-1 | level-2 ]

    An administrative tag is configured for the interface in the IS-IS topology instance.

    An administrative tag is carried in routes and used by route-policies to filter routes.

  7. Run commit

    The configuration is committed.

Verifying the Configuration of IS-IS IPv4 Multi-Topologies Used to Isolate Multicast Services from Unicast Services

After configuring IPv4 IS-IS MT to isolate multicast services from unicast services, check the IS-IS MT configurations.

Prerequisites

IPv4 IS-IS MT has been configured to isolate multicast services from unicast services.

Procedure

  • Run the display isis peer [ verbose ] [ process-id | vpn-instance vpn-instance-name ] command to check information about IS-IS neighbors.
  • Run the display isis route [ process-id | vpn-instance vpn-instance-name ] [ ipv4 ] [ topology topology-name ] [ verbose | [ level-1 | level-2 ] | ip-address [ mask | mask-length ] ] * command to check IS-IS routing information.
  • Run the display isis spf-tree [ systemid systemid ] [ [ level-1 | level-2 ] | topology topology-name ] * verbose [ process-id | vpn-instance vpn-instance-name ] command to check IS-IS SPT information.

Example

Run the display isis peer verbose command to view IS-IS neighbor information. The command output shows that the neighbor status is Up and that the topology instance ID is 10.

<HUAWEI> display isis peer verbose
                         Peer Verbose information for ISIS( 1 )
                         
System Id       Interface         Circuit Id         State HoldTime Type     PRI
--------------------------------------------------------------------------------
0000.0000.2222  GE1/0/2           0000.0000.2222.01  Up    10s      L1(L1L2) 64 

  MT IDs supported     : 0(UP)  3(UP)  4(UP)  10(UP)
  Local MT IDs         : 0  3  4  10
  Area Address(es)     : 00     
  Peer IP Address(es)  : 10.0.0.2          
  Uptime               : 04:36:31
  Adj Protocol         : IPV4
  Restart Capable      : YES
  Suppressed Adj       : NO

  Total Peer(s): 1

Run the display isis route topology red command to view routing information about IS-IS topology instance red.

<HUAWEI> display isis route topology red
                          Route information for ISIS(1)
                          -----------------------------
                                 topology red
                                 --------------
                          ISIS(1) level-2 Forwarding Table
                          --------------------------------

 IPV4 Destination  IntCost    ExtCost ExitInterface     NextHop         Flags
-------------------------------------------------------------------------------
10.0.0.0/24        10         NULL    -                 Direct          D/-/L/- 
                
       Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
                                 U-Up/Down Bit Set 

Run the display isis spf-tree topology red command to view SPT information about IS-IS topology instance red.

<HUAWEI> display isis spf-tree topology red
                          Shortest Path Tree for ISIS(1)
                          ---------------------------------
                                topology red
                                ------------------
            Flags: I-Node is invalid       R-Node is directly reachable
                   O-Node is overload      A-Node is affected
                   U-Link is upward        D-Link is downward
                   F-Link is not on tree   N-Neighbor is attached to link
                   S-Link is IGP Shortcut

                          ISIS(1) Level-1 Shortest Path Tree

 Node              NodeFlag  Distance  Link                 LinkFlag   LinkCost
 ------------------------------------------------------------------------------
0000.0000.0001.00  -/-/-/-   0                                                  
                                        ->0000.0000.0001.01      D     10       
0000.0000.0001.01  -/R/-/-   10                                                 
                                        ->0000.0000.0001.00      U     0        
                                        ->0000.0000.0002.00      D     0        
0000.0000.0002.00  -/-/-/-   10                                                 
                                        ->0000.0000.0001.01      U     10       
`	
                          ISIS(1) Level-2 Shortest Path Tree

 Node              NodeFlag  Distance  Link                 LinkFlag   LinkCost
 ------------------------------------------------------------------------------
0000.0000.0001.00  -/-/-/-   0                                                  
                                        ->0000.0000.0001.01      D     10       
0000.0000.0001.01  -/R/-/-   10                                                 
                                        ->0000.0000.0001.00      U     0        
                                        ->0000.0000.0002.00      D     0        
0000.0000.0002.00  -/-/-/-   10                                                 
                                        ->0000.0000.0001.01      U     10       

Run the display isis spf-tree topology multicast command to view SPT information about IS-IS multicast topologies.

<HUAWEI> display isis spf-tree topology multicast
                          Shortest Path Tree for ISIS(1)
                          ---------------------------------
                                topology multicast
                                ------------------
            Flags: I-Node is invalid       R-Node is directly reachable
                   O-Node is overload      A-Node is affected
                   U-Link is upward        D-Link is downward
                   F-Link is not on tree   N-Neighbor is attached to link
                   S-Link is IGP Shortcut

                          ISIS(1) Level-1 Shortest Path Tree

 Node              NodeFlag  Distance  Link                 LinkFlag   LinkCost
 ------------------------------------------------------------------------------
0000.0000.0001.00  -/-/-/-   0                                                  
                                        ->0000.0000.0001.01      D     10       
0000.0000.0001.01  -/R/-/-   10                                                 
                                        ->0000.0000.0001.00      U     0        
                                        ->0000.0000.0002.00      D     0        
0000.0000.0002.00  -/-/-/-   10                                                 
                                        ->0000.0000.0001.01      U     10       

                          ISIS(1) Level-2 Shortest Path Tree

 Node              NodeFlag  Distance  Link                 LinkFlag   LinkCost
 ------------------------------------------------------------------------------
0000.0000.0001.00  -/-/-/-   0                                                  
                                        ->0000.0000.0001.01      D     10       
0000.0000.0001.01  -/R/-/-   10                                                 
                                        ->0000.0000.0001.00      U     0        
                                        ->0000.0000.0002.00      D     0        
0000.0000.0002.00  -/-/-/-   10                                                 
                                        ->0000.0000.0001.01      U     10       
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Updated: 2019-01-03

Document ID: EDOC1100055018

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