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Example for Configuring Link Redundancy in a Smart Link Group

Networking Requirements

As shown in Figure 1, a dual-homing networking is used to enhance network reliability. The customer wants to eliminate loops on the network while implementing link redundancy and fast convergence.

Figure 1 Link redundancy in a Smart Link group

Configuration Roadmap

The configuration roadmap is as follows:

  1. Create VLANs and configure related interfaces to allow packets of these VLANs to pass through.

  2. Create a Smart Link group on SwitchA and specify the master and slave interfaces.

  3. Enable revertive switching on SwitchA to enable traffic to be switched back to the original active link after the active link recovers.

  4. Enable SwitchA to send Flush packets.

  5. Enable interfaces of SwitchB, SwitchC, and SwitchD to receive Flush packets.

  6. Enable the Smart Link group on SwitchA.

Procedure

  1. Configure VLANs.

    # Create VLANs on SwitchA and configure related interfaces to allow packets of these VLANs to pass through. The configurations of SwitchB, SwitchC, and SwitchD are similar to the configuration of SwitchA, and are not mentioned here.

    <HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] vlan batch 10 to 30 
[SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] port link-type trunk
[SwitchA-GigabitEthernet0/0/1] port trunk allow-pass vlan 10 to 30
[SwitchA-GigabitEthernet0/0/1] quit
[SwitchA] interface gigabitethernet 0/0/2
[SwitchA-GigabitEthernet0/0/2] port link-type trunk
[SwitchA-GigabitEthernet0/0/2] port trunk allow-pass vlan 10 to 30
[SwitchA-GigabitEthernet0/0/2] quit

  2. Create a Smart Link group on SwitchA and specify the master and slave interfaces.

    # Configure SwitchA.

    [SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] stp disable
[SwitchA-GigabitEthernet0/0/1] quit
[SwitchA] interface gigabitethernet 0/0/2
[SwitchA-GigabitEthernet0/0/2] stp disable
[SwitchA-GigabitEthernet0/0/2] quit
[SwitchA] smart-link group 1
[SwitchA-smlk-group1] port gigabitethernet 0/0/1 master
[SwitchA-smlk-group1] port gigabitethernet 0/0/2 slave

  3. Enable revertive switching and set the WTR time.

    # Configure SwitchA.

    [SwitchA-smlk-group1] restore enable
[SwitchA-smlk-group1] timer wtr 30

  4. Enable SwitchA to send Flush packets.

    # Configure SwitchA to send Flush packets containing an SHA-encrypted password.

    [SwitchA-smlk-group1] flush send control-vlan 10 password sha huawei-123

  5. Enable interfaces of SwitchB, SwitchC, and SwitchD to receive Flush packets.

    # Enable SwitchB to receive Flush packets containing an SHA-encrypted password.

    [SwitchB] interface gigabitethernet 0/0/1
[SwitchB-GigabitEthernet0/0/1] smart-link flush receive control-vlan 10 password sha huawei-123
[SwitchB-GigabitEthernet0/0/1] stp disable
[SwitchB-GigabitEthernet0/0/1] quit
[SwitchB] interface gigabitethernet 0/0/2
[SwitchB-GigabitEthernet0/0/2] smart-link flush receive control-vlan 10 password sha huawei-123
[SwitchB-GigabitEthernet0/0/2] stp disable
[SwitchB-GigabitEthernet0/0/2] quit

    # Enable SwitchC to receive Flush packets containing an SHA-encrypted password.

    [SwitchC] interface gigabitethernet 0/0/1
[SwitchC-GigabitEthernet0/0/1] smart-link flush receive control-vlan 10 password sha huawei-123
[SwitchC-GigabitEthernet0/0/1] stp disable
[SwitchC-GigabitEthernet0/0/1] quit
[SwitchC] interface gigabitethernet 0/0/2
[SwitchC-GigabitEthernet0/0/2] smart-link flush receive control-vlan 10 password sha huawei-123
[SwitchC-GigabitEthernet0/0/2] stp disable
[SwitchC-GigabitEthernet0/0/2] quit

    # Enable SwitchD to receive Flush packets containing an SHA-encrypted password.

    [SwitchD] interface gigabitethernet 0/0/1
[SwitchD-GigabitEthernet0/0/1] smart-link flush receive control-vlan 10 password sha huawei-123
[SwitchD-GigabitEthernet0/0/1] stp disable
[SwitchD-GigabitEthernet0/0/1] quit
[SwitchD] interface gigabitethernet 0/0/2
[SwitchD-GigabitEthernet0/0/2] smart-link flush receive control-vlan 10 password sha huawei-123
[SwitchD-GigabitEthernet0/0/2] stp disable
[SwitchD-GigabitEthernet0/0/2] quit

  6. Enable the Smart Link group on SwitchA.

    [SwitchA-smlk-group1] smart-link enable
[SwitchA-smlk-group1] quit

  7. Verify the configuration.

    # Run the display smart-link group command to view information about the Smart Link group on SwitchA. If the following information is displayed, the configuration is successful:

    • The Smart Link function is enabled.
    • The WTR time is 30s.
    • The control VLAN ID is 10.
    • GE0/0/1 is the master interface and is in Active state, whereas GE0/0/2 is the slave interface and is in Inactive state.
    [SwitchA] display smart-link group 1
Smart Link group 1 information :
  Smart Link group was enabled
  Wtr-time is: 30 sec.
  There is no Load-Balance
  There is no protected-vlan reference-instance
  DeviceID: 0018-2000-0083  Control-vlan ID: 10
  Member                  Role   InstanceID State    Flush Count Last-Flush-Time
  ---------------------------------------------------------------------------------

  GigabitEthernet0/0/1    Master 0          Active   1           2009/01/05 10:33:46 UTC+05:00
  GigabitEthernet0/0/2    Slave  0          Inactive 0           0000/00/00 00:00:00 UTC+05:00

    # Run the shutdown command to shut down GE0/0/1. Then GE0/0/1 changes to Inactive state, and GE0/0/2 changes to Active state.

    [SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] shutdown
    [SwitchA-GigabitEthernet0/0/1] display smart-link group 1
Smart Link group 1 information :
  Smart Link group was enabled
  Wtr-time is: 30 sec.
  There is no Load-Balance
  There is no protected-vlan reference-instance 
  DeviceID: 0018-2000-0083  Control-vlan ID: 10
  Member                  Role   InstanceID State    Flush Count Last-Flush-Time
  ---------------------------------------------------------------------------------

  GigabitEthernet0/0/1    Master 0          Inactive 1           2009/01/05 10:33:46 UTC+05:00
  GigabitEthernet0/0/2    Slave  0          Active   1           2009/01/05 10:34:46 UTC+05:00

    # Run the undo shutdown command to restore GE0/0/1.

    [SwitchA-GigabitEthernet0/0/1] undo shutdown

    # After 30s, GE0/0/1 is in Active state and GE0/0/2 is in Inactive state.

    [SwitchA-GigabitEthernet0/0/1] display smart-link group 1
Smart Link group 1 information :
  Smart Link group was enabled
  Wtr-time is: 30 sec.
  There is no Load-Balance
  There is no protected-vlan reference-instance 
  DeviceID: 0018-2000-0083  Control-vlan ID: 10
  Member                  Role   InstanceID State    Flush Count Last-Flush-Time
  ---------------------------------------------------------------------------------

  GigabitEthernet0/0/1    Master 0          Active   2           2009/01/05 10:35:46 UTC+05:00
  GigabitEthernet0/0/2    Slave  0          Inactive 1           2009/01/05 10:34:46 UTC+05:00

Configuration Files

  • SwitchA configuration file

    #
sysname SwitchA
#
vlan batch 10 to 30
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10 to 30
 stp disable
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 10 to 30
 stp disable
#
smart-link group 1
 restore enable
 smart-link enable
 port GigabitEthernet0/0/1 master
 port GigabitEthernet0/0/2 slave
 timer wtr 30
 flush send control-vlan 10 password sha %^%#rwIhOw`~g7,xyl>~|:v9Cyw2CH,7l2\dbzA[cH3YA9BdA;1qqSs%WJHM3|hO%^%#
#
return

  • SwitchB configuration file

    #
sysname SwitchB
#
vlan batch 10 to 30
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10 to 30
 stp disable
 smart-link flush receive control-vlan 10 password sha %^%#fR)IGHHT:>]iNbG:Nq#)<^1p#`np!T#/\V&%)iHB_ibX!99]e#E{/L2Sxw!I%^%#
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 10 to 30
 stp disable
 smart-link flush receive control-vlan 10 password sha %^%#XbPxG#g5C6$/*d2^GRU>3ODTJF_C(Bht`^*}tT05u]7SIZ5y%9bQ!x~3:v;O%^%#
#
return

  • SwitchC configuration file

    #
sysname SwitchC
#
vlan batch 10 to 30
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10 to 30
 stp disable
 smart-link flush receive control-vlan 10 password sha %^%#IOf[Q`=F=QK"O4-j9A}Y-N7<,F~cn%/NR:G-,L5*[SMN,FlIYAZd88*ObE;T%^%#
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 10 to 30
 stp disable
 smart-link flush receive control-vlan 10 password sha %^%#vMK'GvJozEo1Fi:%~jkO<ge&0HgYZVh@ch709e49'r8&M{k6X.NzX)<K_R<P%^%#
#
return

  • SwitchD configuration file

    #
sysname SwitchD
#
vlan batch 10 to 30
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10 to 30
 stp disable
 smart-link flush receive control-vlan 10 password sha %^%#:ssvXl%=T&UGOl$eoPWJaQ'>)@+TbEELAQM=7sh~J1>;>,H<HIEjK$@kW1B1%^%#
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 10 to 30
 stp disable
 smart-link flush receive control-vlan 10 password sha %^%#i~K431w:TERjN]OK0kS+Y*VB=*-BP2+X33UoHVG#{<qPBD:s1.~,2h/s($\&%^%#
#
return
Parent Topic: Configuration Examples for Smart Link and Monitor Link
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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