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ME60 V800R010C10SPC500 Configuration Guide - IP Routing 01

This is ME60 V800R010C10SPC500 Configuration Guide - IP Routing
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Configuring IS-IS MT to Isolate IPv4 Services from IPv6 Services

Configuring IS-IS MT to Isolate IPv4 Services from IPv6 Services

On an IS-IS network, IS-IS MT improves usage of network resources by allowing multiple logical topologies to be deployed.

Usage Scenario

IPv4 and IPv6 share the same topology structure. An IPv4/IPv6 topology is an integrated topology in which IPv4 and IPv6 use the same shortest path in the SPF calculation. Therefore, the topology information of IPv6 must be the same as that of IPv4 when an IPv4/IPv6 topology is deployed.

However, in real-world situations, IPv4 and IPv6 may be deployed differently, and the topology information of IPv6 may differ from that of IPv4. In the scenario where an IPv4/IPv6 topology is deployed, some ME devices and links do not support IPv6, and they cannot receive IPv6 packets from the ME devices supporting the IPv4/IPv6 dual stack. As a result, these IPv6 packets are discarded. Similarly, IPv4 packets cannot be forwarded if ME devices and links that do not support IPv4 on the network. When various end-to-end services, such as voice and data services, share the same physical links, either IPv4 or IPv6 packets are discarded on the shared links, affecting transmission quality.

IS-IS MT allows multiple separate logical topologies to be deployed in an IS-IS AS, and the SPF calculation can be performed in an IPv6 topology independently. In addition, IPv6 forwarding tables can be created for the IPv6 topology.

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 multi-topologies to isolate IPv4 services from IPv6 services, complete the following tasks:

Configuration Procedures

Figure 9-9 Configuring IS-IS MT to isolate IPv4 services from IPv6 services

Enabling 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 IPv4 or IPv6 topology instances as required so that the SPF calculation can be performed for the topology instances in the IS-IS process. Then, configure parameters, you can 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 is created.

  3. Run ipv6 topology topology-name

    An IPv6 topology is created.

  4. Run isis [ process-id ]

    The IS-IS view is displayed.

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

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

    NOTE:
    Go to Step 6 or Step 7 as required.
    • If the ME device supports only IPv4 services, go to Step 6.
    • If the ME device supports only IPv6 services, go to Step 7.
    • If the ME device supports both IPv4 and IPv6 services, perform the following steps.

  6. Run topology topology-name [ topology-id { mulitcast | topology-id } ]

    The IS-IS process is associated with a specified IPv4 topology instance, and the IS-IS IPv4 topology instance view is displayed.

  7. Run ipv6 topology topology-name [ topology-id { mulitcast | topology-id } ]

    The IS-IS process is associated with a specified IPv6 topology instance, and the IS-IS IPv6 topology instance view is displayed.

  8. (Optional) Configure IS-IS features for 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.

  9. Run commit

    The configuration is committed.

Enabling MT for an IS-IS Interface

After IS-IS MT is enabled, associate a specified interface with MT 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

An interface transmitting different services needs to be associated with different topology instances. Perform the following operations:

Procedure

  1. Associate an interface with an IPv4 topology instance.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run ip topology topology-name enable

      An IPv4 topology instance is bound to the interface.

    4. Run isis topology topology-name

      An IPv4 topology instance is enabled on the interface.

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

      A cost is configured on the interface for the IS-IS IPv4 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 on the interface for the IS-IS IPv4 topology instance.

    7. Run commit

      The configuration is committed.

  2. Associate an interface with an IPv6 topology instance.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run ipv6 topology topology-name enable

      An IPv6 topology instance is bound to the interface.

    4. Run isis ipv6 topology topology-name

      An IPv6 topology instance is enabled on the interface.

    5. (Optional) Run isis ipv6 topology topology-name cost cost [ level-1 | level-2 ]

      A cost is configured on the interface for the IS-IS IPv6 topology instance.

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

    6. (Optional) Run isis ipv6 topology topology-name tag-value tag [ level-1 | level-2 ]

      An administrative tag is configured on the interface for the IS-IS IPv6 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 Multi-Topologies Used to Isolate IPv4 Services from IPv6 Services

After configuring IPv4 IS-IS MT to isolate IPv4 services from IPv6 services, check the configuration about IS-IS multi-topologies.

Prerequisites

IPv4 IS-IS MT has been configured to isolate IPv4 services from IPv6 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 | ipv6] [ topology topology-name ] [ verbose | [ level-1 | level-2 ] ] command to check IS-IS routing information.
  • Run the display isis spf-tree [ systemid systemid ] [ [ level-1 | level-2 ] | ipv6 | 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 IDs are 0, 3, 4, and 10.

<HUAWEI> display isis peer verbose

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-1 Forwarding Table
                          --------------------------------

 IPV4 Destination  IntCost    ExtCost ExitInterface     NextHop         Flags
-------------------------------------------------------------------------------
10.0.0.0/24        10         NULL    GE1/0/2           Direct          D/-/L/- 

       Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
                                 U-Up/Down Bit Set 

                          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 IPv4 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 ipv6 topology blue command to view SPT information about IS-IS IPv6 topology instance blue.

<HUAWEI> display isis spf-tree ipv6 topology blue
                          Shortest Path Tree for ISIS(1)
                          ---------------------------------
                                ipv6 topology blue
                                ------------------
            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: 2019-01-04

Document ID: EDOC1100059437

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