Configure Fabric Extend Logical Interfaces

Use the following procedure to configure Fabric Extend (FE) on switches with native FE support.

Configure Fabric Extend Logical Interfaces for Native Support

Configuring Fabric Extend (FE) consists of two primary tasks: configuring the tunnel source address and configuring the logical interface. These tasks must be completed on both ends of the tunnel.

About this task

VRF is an optional parameter. If you do not configure a VRF, then FE uses the GRT.

For a logical IS-IS interface, Layer 2 and Layer 3 refer to the following use cases:

Layer 2 — Fabric Extend VID (FE-VID)
Layer 3 — Fabric Extend IP (FE-IP)

Procedure

In the navigation pane, expand Configuration > Fabric.
Select IS-IS.
Select the Logical Interfaces tab.
Select Insert.
For Id, type the index number that uniquely identifies this logical interface.
For Type, select the type of core network that the tunnel will traverse:

Note

Different fields are available depending on the type of core network you select.
- If it is a Layer 2 Core, select layer2.
- If it is a Layer 3 Core, select ip.
For Name, type the name of this logical interface.
Optional: For BFDEnable, select enable to enable BFD.
For a Layer 2 Core, configure the following fields:
1. For DestIfIndex, select the physical port that the logical interface connects to or enter the name of the MLT.
2. For Vids, type the list of VLANs for this logical interface.
3. For PrimaryVid, type the primary tunnel VLAN ID.
  
  Note
  
  The primary VLAN ID must be one of the VIDs listed in the Vids field.
For a Layer 3 Core, complete the following field:
1. For DestIPAddr, type the destination IP address for the logical interface.
Select Insert.

Logical Interfaces Field Descriptions

Use the data in the following table to use the Logical Interfaces tab and the Insert Logical Interfaces dialog. The available fields in the dialog differ depending on the type of core you select: layer 2 or ip.


Name	Description
Id	Specifies the index number that uniquely identifies this logical interface. This field displays on the Insert Logical Interfaces dialog only.
IfIndex	Specifies the index number that uniquely identifies this logical interface. This field is read-only. This field displays on the Logical Interfaces tab only.
Name	Specifies the administratively assigned name of this logical interface, which can be up to 64 characters.
Type	Specifies the type of logical interface to create: Specify layer 2 for a Layer 2 core network that the tunnel will traverse. Specify ip for a Layer 3 core network that the tunnel will traverse.
DestIPAddr	Specifies the destination IP address for the IP-type logical interface.
DestIfIndex	Specifies the physical port or MultiLink Trunking (MLT) that the Layer 2 logical interface is connected to.
Vids	Specifies the list of VLANs that are associated with this logical interface.
PrimaryVid	Specifies the primary tunnel VLAN ID associated with this Layer 2 Intermediate-System-to-Intermediate-System (IS-IS) logical interface.
CircIndex	Identifies the IS-IS circuit created under the logical interface. This field displays on the Logical Interfaces tab only.
NextHopVrf	Displays the next-hop VRF name to reach the logical tunnel destination IP. This field displays on the Logical Interfaces tab only.
BfdEnable	Enables or disables BFD on an IS-IS Logical Interface.