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Configuration Guide - IP Routing 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 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 NEs.

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

  • 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

GE0/1/0

10.0.1.1/24

GE0/2/0

10.1.1.1/24

Device B

GE0/1/0

10.1.1.2/24

GE0/2/0

10.2.1.1/24

Device C

GE0/1/0

10.0.1.2/24

GE0/2/0

10.3.1.1/24

Device D

GE0/1/0

10.3.1.2/24

GE0/2/0

10.2.1.2/24

GE0/3/0

10.4.1.1/24

Configuration Roadmap

The configuration roadmap is as follows:

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

  2. Set a higher link cost (in compliance with the traffic protection inequality of IS-IS Auto FRR) on GE 0/2/0 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 NE

  • NET of each NE

  • Level of each NE

  • Costs of interfaces on each NE

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 0/1/0
[*DeviceA-GigabitEthernet0/1/0] isis enable 1
[*DeviceA-GigabitEthernet0/1/0] quit
[*DeviceA] interface gigabitethernet 0/2/0
[*DeviceA-GigabitEthernet0/2/0] isis enable 1
[*DeviceA-GigabitEthernet0/2/0] commit
[~DeviceA-GigabitEthernet0/2/0] 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 0/1/0
[*DeviceB-GigabitEthernet0/1/0] isis enable 1
[*DeviceB-GigabitEthernet0/1/0] quit
[*DeviceB] interface gigabitethernet 0/2/0
[*DeviceB-GigabitEthernet0/2/0] isis enable 1
[*DeviceB-GigabitEthernet0/2/0] commit
[~DeviceB-GigabitEthernet0/2/0] 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 0/1/0
[*DeviceC-GigabitEthernet0/1/0] isis enable 1
[*DeviceC-GigabitEthernet0/1/0] quit
[*DeviceC] interface gigabitethernet 0/2/0
[*DeviceC-GigabitEthernet0/2/0] isis enable 1
[*DeviceC-GigabitEthernet0/2/0] commit
[~DeviceC-GigabitEthernet0/2/0] 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 0/1/0
[*DeviceD-GigabitEthernet0/1/0] isis enable 1
[*DeviceD-GigabitEthernet0/1/0] quit
[*DeviceD] interface gigabitethernet 0/2/0
[*DeviceD-GigabitEthernet0/2/0] isis enable 1
[*DeviceD-GigabitEthernet0/2/0] commit
[~DeviceD-GigabitEthernet0/2/0] quit

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

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

    [~DeviceA] interface gigabitethernet 0/2/0
[~DeviceA-GigabitEthernet0/2/0] isis cost 30
[*DeviceA-GigabitEthernet0/2/0] commit
[~DeviceA-GigabitEthernet0/2/0] 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                            GE0/1/0                   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                            GE0/1/0                   0x00000003    
 (B)10.1.1.2                           GE0/2/0                   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 0/1/0
 undo shutdown
 ip address 10.0.1.1 255.255.255.0
 isis enable 1
#
interface gigabitethernet 0/2/0
 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 0/1/0
 undo shutdown
 ip address 10.1.1.2 255.255.255.0
 isis enable 1
#
interface gigabitethernet 0/2/0
 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 0/1/0
 undo shutdown
 ip address 10.0.1.2 255.255.255.0
 isis enable 1
#
interface gigabitethernet 0/2/0
 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 0/1/0
 undo shutdown
 ip address 10.3.1.2 255.255.255.0
 isis enable 1
#
interface gigabitethernet 0/2/0
 undo shutdown
 ip address 10.2.1.2 255.255.255.0
 isis enable 1
#
interface gigabitethernet 0/3/0
 undo shutdown
 ip address 10.4.1.1 255.255.255.0
 isis enable 1
#
return
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Updated: 2019-01-14

Document ID: EDOC1100058916

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