Configure Fabric Extend Logical Interfaces

Use this procedure to configure the Fabric Extend logical interface.

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.

Before you begin

Configure the Fabric Extend tunnel with a tunnel source IP address. See Configure Fabric Extend Tunnels.

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 Name, type the name of 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.
Optional: For BFDEnable, select enable to enable BFD.
For a Layer 2 Core, configure the following parameters:
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 Vids.
For a Layer 3 Core, complete the following parameters:
1. For DestIPAddr, type the destination IP address for the logical interface.
2. For ISIS Mtu, enter the Maximum Transmission Unit value, in bytes.
Optional: Configure a parallel tunnel for Fabric Extend:
1. For SrcIPAddr, type the source address for the parallel tunnel.
2. For NextHopVrf, select the VRF name to reach the logical tunnel destination IP associated with the parallel tunnel.
3. Select Apply.
Select Insert.

What to do next

Configure Fabric Extend on the switch at the other end of the tunnel.

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 a name associated with this logical interface, which can be up to 64 characters. Note: If you do not assign a name when you configure virtual NNI links for Multi-Area boundary nodes for 7520 Series and 7720 Series, the system autogenerates the name and displays the name as `Virtual-link-x`, where `x` is the logical interface ID.
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. You can use this field to specify the VRF to reach the logical tunnel destination IP associated with a parallel tunnel.
ISIS Mtu	Specifies the Maximum Transmission Unit (MTU) size in bytes for IS-IS packets that use this logical interface. The default value is 1600.
BfdEnable	Enables or disables BFD on an IS-IS Logical Interface.
SrcIPAddr	Configures an additional source address to use as the parallel tunnel to create a backup adjacency. Note: To use an IPsec-encrypted tunnel as the parallel tunnel ensure that you configure the same source IP address on the logical IS-IS interface and in the Fabric IPsec Gateway virtual machine.
Origin	Specifies the origin of the IS-IS logical interface configuration, either through Zero Touch Fabric Configuration (ZTF) or manual configuration (config) through CLI or EDM.
Multi-Area Virtual Link Note: Exception: only applies to 7520 Series and 7720 Series.	Enables (true) or disables (false) a Multi-area boundary node virtual NNI link on an IS-IS Logical Interface. The default is disabled.