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How to configure Active/Standby port or LAG feature in EXOS

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TitleHow to configure Active/Standby port or LAG feature in EXOS
Objective
  • How to configure Active/Standby port or LAG feature in EXOS?
Environment
  • EXOS
  • Summit & BlackDiamond
  • Active - Standby / Software-Controlled Redundant port
Procedure
  • Active Standby feature in EXOS is known as Software-controlled Redundant port (SRP).
  • A software-controlled redundant port is configured to back up a specified primary port.
  • The redundant port tracks the link state of the associated primary port, and if the link on the primary port fails, the redundant port establishes a link and becomes active.
  • The following command will be used to configure Software redundant port (SRP) in EXOS:
configure ports primaryPort redundant secondaryPort {link [on | off]}
  • The Link option specifies the state of link of Redundant port. If you configure Link ON option, it will keep the redundant port active, but will block the traffic and Link OFF option will force the link down on redundant port.
NOTE: The default value is OFF.
  • SRP can also be used to configure an Active Standby LAG. For example, if you have LAG1 containing port 1:1 and LAG2 containing port 2:1 connected to peer switch/stack.
* Slot-1 Stack.9 # show sharing
Load Sharing Monitor
Config    Current Agg     Min     Ld Share    Ld Share  Agg   Link   Link Up
Master    Master  Control Active  Algorithm   Group     Mbr   State  Transitions
================================================================================
   1:1    1:1     LACP       1     L3          1:1        Y      A        3
   2:1    2:1     LACP       1     L3          2:1        Y      A        3
================================================================================
  • Now if you want only one of these LAG to be active at any given time then you can combine both master ports of LAG and form one redundant port configuration.
Slot-1 Stack.9 # configure port 1:1 redundant 2:1 link off
* Slot-1 Stack.10 # show sharing
Load Sharing Monitor
Config    Current Agg     Min     Ld Share    Ld Share  Agg   Link   Link Up
Master    Master  Control Active  Algorithm   Group     Mbr   State  Transitions
================================================================================
   1:1    1:1     LACP       1     L3          1:1        Y      A        3
   2:1            LACP       1     L3          2:1        -      R        3
================================================================================
  •  The above command will ensure that LAG1 will be Active at any given time.
  • LAG1 will be treated as down only if port 1:1 goes down and then redundant port will take action and will become active.
Slot-1 Stack.11 # disable port 1:1
Slot-1 Stack.12 # show ports 1:1,2:1 configuration no-refresh
Port Configuration
Port     Virtual    Port  Link  Auto   Speed      Duplex   Flow  Load   Media
         router     State State Neg  Cfg Actual Cfg Actual Cntrl Master Pri Red
================================================================================
1:1      VR-Default  D      R    ON  AUTO       AUTO                    UTP
2:1      VR-Default  E      A    ON  AUTO  1000 AUTO FULL    SYM        UTP
================================================================================
* Slot-1 Stack.13 # show sharing
Load Sharing Monitor
Config    Current Agg     Min     Ld Share    Ld Share  Agg   Link   Link Up
Master    Master  Control Active  Algorithm   Group     Mbr   State  Transitions
================================================================================
   1:1            LACP       1     L3          1:1        -      R        3
   2:1    2:1     LACP       1     L3          2:1        Y      A        4
================================================================================
NOTE: The master port is the only port of a load-sharing group that can be configured as either a primary or redundant port. (The entire trunk must go down before the software-controlled redundant port takes effect.)

 
Additional notes
  • When Configuring Software redundant port, the following criteria must be considered:
  1. You can configure only one redundant port for each primary port.
  2. The primary and redundant port must have identical VLAN memberships.
  3. Only one side of the link should be configured as redundant.
  4. You cannot have any Layer 2 protocols configured on any of the VLANs that are present on the
    ports. (You will see an error message if you attempt to configure software redundant ports on ports
    with VLANs running Layer 2 protocols.)

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