# Configuring an IST MLT

Use this procedure to configure an IST MLT.

| Important
| For SMLT to function properly, you must manually disable STP on all SMLT, IST, and SLT ports in all spanning tree groups or instances to which the ports belong. From Release 6.2 onwards, STP is automatically disabled by software on all SMLT ports. You must also disable STP on all edge switch MLT ports that are connected to the SMLT or SLT.

## Procedure steps

1. From the navigation tree, double-click VLAN.

2. From the VLAN tree, click MLT/LACP.

3. Select the MultiLink Trunks tab.

4. In the row containing the desired MLT, double-click the PortMembers field.

5. Select the ports to include in the MLT and click OK.

   For the 5000 Series, up to eight same-type ports can belong to a single MLT.

6. Double-click the Enable field and choose true.

7. Double-click the MltType field and choose istMLT from the list.

8. Click Apply.

9. Select any field in the IST MLT row and click the istMlt button.

10. In the PeerIp field, enter a peer IP address.

11. In the VlanId field, enter a VLAN ID.

12. In the SessionEnable field, click enable.

13. Click Apply.

## Variable definitions

The following table describes the IST MLT parameters .

Table 1. MLT/LACP IST MLT parameters
Variable | Value
--- | ---
PeerIp | Indicates the IST MLT peer IP address.
VlanId | Specifies an IST VLAN ID number from 1 to 4095.
SessionEnable | Displays the Enable/disable IST functionality.
Session Status | Displays the status: up or down