Enabling and Disabling a Virtual Link Extension End-to-End


At times, whether in the CLI or in the Arista NetVisor UNUM GUI, it can be convenient to manage vLE ports in pairs as a single entity (instead of doing so individually). Starting from NetVisor OS release 6.0.0, a new end-to-end vLE configuration option can be used to enable or disable both vLE ports at the same time as part of the vle-create command.


The new ports-state option can have three values:

  • override is the default setting which means that, as usual, each individual port state configuration takes precedence
  • disable means that both vLE ports get disabled together and this option takes precedence over each individual port state
  • enable means that both vLE ports get enabled and this option takes precedence over each individual port state.


For example:


CLI (network-admin@swi01) > vle-create name vle-test node-1 swi01 node-2 swi02 node-1-port 13 node-2-port 13 no-tracking ports-state disable


Note: If node-1 and node-2 are the same switch, then it becomes a local vLE configuration.


The vle-modify command can be used to further change the end-to-end vLE configuration after the initial vle-create.


For example, after setting ports-state to disable in vle-create, the user can revert to the default behavior in which local port configuration takes prececence with the following command:


CLI (network-admin@swi01) > vle-modify name vle-test ports-state override


In case of responsibility conflict in the CLI a message is printed out to explain what is taking precedence and to suggest a possible course of action.


For example, when a user tries to disable a vLE port when ports-state is set to enable, the following message is printed:


CLI (network-admin@swi01) > vle-show layout vertical

name:         vle-test

vnet:         

node-1:       swi01

node-2:       swi02

node-1-port:  13

node-2-port:  13

status:       up

tracking:     enabled

ports-state:  enable

create-time:  08:47:56


CLI (network-admin@swi01) > port-config-modify port 13 disable

port-config-modify: could not disable port 13 as it is VLE vle-test administratively enabled port. Use the following cli to override: vle-modify name vle-test ports-state override


Similarly, when a user tries to enable a vLE port when ports-state is disable:


CLI (network-admin@swi01) > vle-show layout vertical

name:         vle-test

vnet:         

node-1:       swi01

node-2:       swi02

node-1-port:  13

node-2-port:  13

status:       disabled

tracking:     enabled

ports-state:  disable

create-time:  08:47:56


CLI (network-admin@swi01) > port-config-modify port 13 enable

port-config-modify: could not enable port 13 as it is VLE vle-test administratively disabled port. Use the following cli to override: vle-modify name vle-test ports-state override


Even when the user configuration intent is the same (both in the local configuration and the vLE configuration), but there is still a responsibility conflict, a message is also printed out. For example, when a user tries to disable a vLE port when ports-state is disable:


CLI (network-admin@swi01) > vle-show layout vertical

name:         vle-test

vnet:         

node-1:       swi01

node-2:       swi02

node-1-port:  13

node-2-port:  13

status:       disabled

tracking:     enabled

ports-state:  disable

create-time:  08:47:56


CLI (network-admin@swi01) > port-config-modify port 13 disable

port-config-modify: could not disable port 13 as it is VLE vle-test administratively disabled port. Use the following cli to override: vle-modify name vle-test ports-state override


Or when a user tries to enable a vLE port when ports-state is enable:


CLI (network-admin@swi01) > vle-show layout vertical

name:         vle-test

vnet:         

node-1:       swi01

node-2:       swi02

node-1-port:  13

node-2-port:  13

status:       up

tracking:     enabled

ports-state:  enable

create-time:  08:47:56


CLI (network-admin@swi01) > port-config-modify port 13 enable

port-config-modify: could not enable port 13 as it is VLE vle-test administratively enabled port. Use the following cli to override: vle-modify name vle-test ports-state override

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