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Configuring Virtual Link Extension State Tracking

In addition to the above configuration steps, it is often common to also turn on state tracking in order to make sure that link state changes are mirrored:

CLI (network-admin@leaf-1)> vle-create name vLE-1 node-1 leaf-1 node-1-port 10 node-2 leaf-5 node-2-port 17 tracking

This configuration step requires specifying the two vLE nodes (leaf-1 and leaf-5) as well as their respective ports in addition to the tracking option by following this syntax:

CLI (network-admin@leaf-1)> vle-create

vle-create	Create vLE configuration.
name name-string	Specify the vLE name.
vnet vnet-name	Specify the vNET assigned to this vLE.
node-1 fabric-node name	Specify the vLE node 1 name.
node-2 fabric-node name	Specify the vLE node 2 name.
node-1-port node-1-port-number	Specify the vLE node 1 port.
node-2-port node-2-port-number	Specify the vLE node 2 port.
node-1-port-desc node-1-port-desc-string	Specify a description for the node 1 port.
node-2-port-desc node-2-port-desc-string	Specify a description for the node 2 port.
[tracking\|no tracking]	Enable or disable tracking between vLE ports.
ports-state override\|enable\|disable	Specify the ports admin control state.

The link state tracking configuration can be verified with the vle-show command:

CLI (network-admin@leaf-1) > vle-show layout vertical

name: vLE-1

vnet:

node-1: leaf-1

node-2: leaf-5

node-1-port: 10

node-2-port: 17

node-1-port-desc:

node-2-port-desc:

status: up

tracking: enabled

ports-state: override

create-time: 08:47:56

Furthermore, since a vLE transparently transmits PDUs over to the other end, it is possible to test state tracking by leveraging for example the LLDP protocol messages exchanged between two test switches (sw-1 and sw-2 in the figure above) connected to the vLE ports 10 and 17.

The two test switches exchange LLDP messages by default, so the LLDP peer relationship can just be shown with the command:

CLI (network-admin@sw-1) > lldp-show

switch local-port bezel-port chassis-id port-id port-desc sys-name

------ ---------- ---------- ---------- ------- ----------------- --------

sw-1 1 1 0b0012c0 1 PN Switch Port(1) sw-2

Then, if a vLE port is disabled (in this case, port 10), the peer relationship is lost and lldp-show does not display a neighbor anymore. The test switch’s port also goes down thanks to vLE state tracking. Once the port is re-enabled, the neighboring relationship is re-established:

CLI (network-admin@leaf-5) > port-config-modify port 17 disable

CLI (network-admin@sw-1) > port-phy-show port 1

switch port bezel-port state speed eth-mode max-frame learning def-vlan

------ ---- ---------- ----- ----- ---------- --------- -------- --------

sw-1 1 1 down 10000 10Gbase-cr 1540 off 0

CLI (network-admin@sw-1) > lldp-show

CLI (network-admin@leaf-5) > port-config-modify port 17 enable

CLI (network-admin@leaf-5) > port-phy-show port 17

port bezel-port state speed eth-mode max-frame learning def-vlan

---- ---------- ----- ----- -------- --------- -------- --------

17 17 up 10000 10G-SFI 1540 off 0

CLI (network-admin@sw-1) > port-phy-show port 1

switch port bezel-port state speed eth-mode max-frame learning def-vlan

-------- ---- ---------- ----- ----- ---------- --------- -------- --------

sw-1 1 1 up 10000 10Gbase-cr 1540 off 1

CLI (network-admin@sw-1) > lldp-show

switch local-port bezel-port chassis-id port-id port-desc sys-name

------- ---------- ---------- ---------- ------- ----------------- --------

sw-1 1 1 0b0012c0 1 PN Switch Port(1) sw-2

To enable or disable tracking between existing vLE ports, use the vle-modify command:

CLI (network-admin@switch) > vle-modify name name-string tracking|no tracking

vle-modify	Modify virtual link extension tracking
name name-string	The vLE name to be modified
tracking\|no tracking	Enable or disable tracking between vLE ports

To delete a state tracking configuration, use the vle-delete command:

CLI (network-admin@switch) > vle-delete name name-string

Configuring vLE in vNET

Starting from Netvisor ONE version 6.1.0, you can configure a vLE on vNET managed ports. This enhancement enables you to separate the management of the feature on a per tenant basis.

To configure a vLE in a vNET, follow the steps from step 1 to step 4 discussed in the Configuring Virtual Link Extension section. You can then use the vle-create command to configure the vNET and enable state tracking. For example, as an extension of step 4, you can assign the vNET vnet1 to the vLE vLE-1 and enable state tracking by using the command:

CLI (network-admin@switch) > vle-create name vLE-1 vnet vnet1 node-1 leaf-1 node-1-port 10 node-2 leaf2 node-2-port 17 tracking

Note: vLE creation is not allowed on vNET shared ports.

Use the vle-show command to display the configuration.

CLI (network-admin@switch) > vle-show

vle-show	Display vLE configuration.
name name-string	The vLE name.
id	The ID assigned to the vLE.
vnet vnet-name	The vNET assigned to this vLE.
node-1 fabric-node-name	vLE node 1 name.
node-2 fabric-node-name	vLE node 2 name.
node-1-port node-1-port-number	vLE node 1 port.
node-2-port node-2-port-number	vLE node 2 port.
node-1-port-desc node-1-port-desc-string	Description for the node 1 port.
node-2-port-desc node-2-port-desc-string	Description for the node 2 port.
status unknown\|remote-down\|local-down\|up\|down\|disabled	The vLE status.
[tracking\|no tracking]	Enable or disable tracking between vLE ports.
ports-state override\|enable\|disable	Ports admin control state.
create-time date/time: yyyy-mm-ddTHH:mm:ss	Time at which the vLE was created.
elapsed-time duration: #d#h#m#s	Time duration since the vLE was created.
up-time duration: #d#h#m#s	Time since the last instance at which the vLE came online.

CLI (network-admin@leaf-1) > vle-show format all layout vertical

name: vle1

id: 900ad7:0

vnet: vnet1

node-1: leaf-1

node-2: leaf-2

node-1-port: 10

node-2-port: 17

node-1-port-desc:

node-2-port-desc:

status: up

tracking: enabled

ports-state: override

create-time: 09:44:56

elapsed-time: 11m37s

up-time: 0s