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NE40E V800R010C10SPC500 Configuration Guide - IP Routing 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Routing
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Example for Configuring IS-IS Auto FRR

Example for Configuring IS-IS Auto FRR

Networking Requirements

If a fault occurs on a network, IS-IS Auto FRR fast switches traffic to a backup link before the route convergence, which prevents traffic interruption.

In Figure 9-22:

  • IS-IS runs between four routers.

  • The four routers are all Level-1-2 routers.

  • If Device C or Link T fails, it is required that the traffic forwarded by Device A be rapidly switched to the backup link.

Figure 9-22 Configuring IS-IS Auto FRR

Device Name

Interface

IP Address

Device A

GE1/0/0

10.0.1.1/24

GE2/0/0

10.1.1.1/24

Device B

GE1/0/0

10.1.1.2/24

GE2/0/0

10.2.1.1/24

Device C

GE1/0/0

10.0.1.2/24

GE2/0/0

10.3.1.1/24

Device D

GE1/0/0

10.3.1.2/24

GE2/0/0

10.2.1.2/24

GE3/0/0

10.4.1.1/24

Configuration Roadmap

The configuration roadmap is as follows:

  1. Enable basic IS-IS functions on each router.

  2. Set a higher link cost (in compliance with the traffic protection inequality of IS-IS Auto FRR) on GE 2/0/0 of Device A, and ensure that Link T is preferentially selected.

  3. Enable IS-IS Auto FRR on Device A that forwards the protected traffic.

Data Preparation

To complete the configuration, you need the following data:

  • IP addresses of interfaces on each router

  • NET of each router

  • Level of each router

  • Costs of interfaces on each router

Procedure

  1. Configure IP addresses for interfaces. For configuration details, see Configuration Files in this section.
  2. Configure basic IS-IS functions.

    # Configure Device A.

    [~DeviceA] isis 1
    [*DeviceA-isis-1] is-level level-1-2
    [*DeviceA-isis-1] network-entity 10.0000.0000.0001.00
    [*DeviceA-isis-1] quit
    [*DeviceA] interface gigabitethernet 1/0/0
    [*DeviceA-GigabitEthernet1/0/0] isis enable 1
    [*DeviceA-GigabitEthernet1/0/0] quit
    [*DeviceA] interface gigabitethernet 2/0/0
    [*DeviceA-GigabitEthernet2/0/0] isis enable 1
    [*DeviceA-GigabitEthernet2/0/0] commit
    [~DeviceA-GigabitEthernet2/0/0] quit

    # Configure Device B.

    [~DeviceB] isis 1
    [*DeviceB-isis-1] is-level level-1-2
    [*DeviceB-isis-1] network-entity 10.0000.0000.0002.00
    [*DeviceB-isis-1] quit
    [*DeviceB] interface gigabitethernet 1/0/0
    [*DeviceB-GigabitEthernet1/0/0] isis enable 1
    [*DeviceB-GigabitEthernet1/0/0] quit
    [*DeviceB] interface gigabitethernet 2/0/0
    [*DeviceB-GigabitEthernet2/0/0] isis enable 1
    [*DeviceB-GigabitEthernet2/0/0] commit
    [~DeviceB-GigabitEthernet2/0/0] quit

    # Configure Device C.

    [~DeviceC] isis 1
    [*DeviceC-isis-1] is-level level-1-2
    [*DeviceC-isis-1] network-entity 10.0000.0000.0003.00
    [*DeviceC-isis-1] quit
    [*DeviceC] interface gigabitethernet 1/0/0
    [*DeviceC-GigabitEthernet1/0/0] isis enable 1
    [*DeviceC-GigabitEthernet1/0/0] quit
    [*DeviceC] interface gigabitethernet 2/0/0
    [*DeviceC-GigabitEthernet2/0/0] isis enable 1
    [*DeviceC-GigabitEthernet2/0/0] commit
    [~DeviceC-GigabitEthernet2/0/0] quit

    # Configure Device D.

    [~DeviceD] isis 1
    [*DeviceD-isis-1] is-level level-1-2
    [*DeviceD-isis-1] network-entity 10.0000.0000.0004.00
    [*DeviceD-isis-1] quit
    [*DeviceD] interface gigabitethernet 1/0/0
    [*DeviceD-GigabitEthernet1/0/0] isis enable 1
    [*DeviceD-GigabitEthernet1/0/0] quit
    [*DeviceD] interface gigabitethernet 2/0/0
    [*DeviceD-GigabitEthernet2/0/0] isis enable 1
    [*DeviceD-GigabitEthernet2/0/0] commit
    [~DeviceD-GigabitEthernet2/0/0] quit

  3. Set the cost of Gigabit Ethernet 2/0/0 on Device A to 30, and then check routing information.

    # Configure the cost of GE 2/0/0 on Device A to 30.

    [~DeviceA] interface gigabitethernet 2/0/0
    [~DeviceA-GigabitEthernet2/0/0] isis cost 30
    [*DeviceA-GigabitEthernet2/0/0] commit
    [~DeviceA-GigabitEthernet2/0/0] quit

    # Check information about the link from Device A to Device D. Link T has a lower cost, and IS-IS preferentially selects Link T to send traffic that is forwarded by Device A.

    [~DeviceA] display isis route verbose
                                                                                    
                             Route information for ISIS(1)                          
                             -----------------------------                          
                                                                                    
                            ISIS(1) Level-1 Forwarding Table                        
                            --------------------------------                        
                                                                                    
     IPV4 Dest  : 10.4.1.0/24       Int. Cost : 30            Ext. Cost : NULL     
     Admin Tag  : -                  Src Count : 1             Flags     : A/-/L/-/-
     Priority   : Low 
     NextHop    :                    Interface :               ExitIndex :          
        10.0.1.2                            GE1/0/0                   0x00000003
                                                                                    
         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 Dest  : 10.4.1.0/24       Int. Cost : 30            Ext. Cost : NULL     
     Admin Tag  : -                  Src Count : 3             Flags     : -/-/-/-/-
                                                                                    
         Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
                                     U-Up/Down Bit Set   
    

  4. Enable IS-IS Auto FRR.

    # Enable IS-IS Auto FRR on Device A.

    [~DeviceA] isis
    [~DeviceA-isis-1] frr
    [*DeviceA-isis-1-frr] loop-free-alternate
    [*DeviceA-isis-1-frr] commit
    [~DeviceA-isis-1-frr] quit
    [~DeviceA-isis-1] quit

  5. Verify the configuration.

    # Check information about the link from Device A to Device D. The command output shows that IS-IS generates a backup link.

    [~DeviceA] display isis route verbose
                                                                                    
                             Route information for ISIS(1)                          
                             -----------------------------                          
                                                                                    
                            ISIS(1) Level-1 Forwarding Table                        
                            --------------------------------                        
                                                                                    
     IPV4 Dest  : 10.4.1.0/24       Int. Cost : 30            Ext. Cost : NULL     
     Admin Tag  : -                  Src Count : 1             Flags     : A/-/L/-/-
     Priority   : Low 
     NextHop    :                    Interface :               ExitIndex :          
        10.0.1.2                            GE1/0/0                   0x00000003    
     (B)10.1.1.2                           GE2/0/0                   0x00000004
                                                                                    
         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 Dest  : 10.4.1.0/24       Int. Cost : 30            Ext. Cost : NULL     
     Admin Tag  : -                  Src Count : 3             Flags     : -/-/-/-/-
                                                                                    
         Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
                                     U-Up/Down Bit Set   
    

Configuration Files

  • Device A configuration file

    #
    sysname DeviceA
    #
    isis 1
     network-entity 10.0000.0000.0001.00
     frr
      loop-free-alternate level-1
      loop-free-alternate level-2
    #
    interface gigabitethernet 1/0/0
     undo shutdown
     ip address 10.0.1.1 255.255.255.0
     isis enable 1
    #
    interface gigabitethernet 2/0/0
     undo shutdown
     ip address 10.1.1.1 255.255.255.0
     isis enable 1
     isis cost 30
    #
    return
  • Device B configuration file

    #
    sysname DeviceB
    #
    isis 1
     network-entity 10.0000.0000.0002.00
    #
    interface gigabitethernet 1/0/0
     undo shutdown
     ip address 10.1.1.2 255.255.255.0
     isis enable 1
    #
    interface gigabitethernet 2/0/0
     undo shutdown
     ip address 10.2.1.1 255.255.255.0
     isis enable 1
    #
    return
  • Device C configuration file

    #
    sysname DeviceC
    #
    isis 1
     network-entity 10.0000.0000.0003.00
    #
    interface gigabitethernet 1/0/0
     undo shutdown
     ip address 10.0.1.2 255.255.255.0
     isis enable 1
    #
    interface gigabitethernet 2/0/0
     undo shutdown
     ip address 10.3.1.1 255.255.255.0
     isis enable 1
    #
    return
  • Device D configuration file

    #
    sysname DeviceD
    #
    isis 1
     network-entity 10.0000.0000.0004.00
    #
    interface gigabitethernet 1/0/0
     undo shutdown
     ip address 10.3.1.2 255.255.255.0
     isis enable 1
    #
    interface gigabitethernet 2/0/0
     undo shutdown
     ip address 10.2.1.2 255.255.255.0
     isis enable 1
    #
    interface gigabitethernet 3/0/0
     undo shutdown
     ip address 10.4.1.1 255.255.255.0
     isis enable 1
    #
    return
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Updated: 2019-01-03

Document ID: EDOC1100055018

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