Configure Fabric Extend
Use the following procedure to configure Fabric Extend (FE) between a Main office to a Branch office, which is a typical deployment. However, if your deployment creates tunnels between two switches that support Fabric Extend natively, then repeat those steps and ignore the steps for switches that require an ONA.
Before you begin
The tunnel source IP address can be a brouter port IP, a CLIP IP, or a VLAN IP.
![Note](images/note.png)
Note
Product Notice: Except VSP 8600 Series, all product series support a VLAN IP as the Fabric Extend tunnel source IP address.
For information about product support, see Fabric Extend Considerations.
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The tunnel source IP address must be on the GRT, not on a VRF.
Note
A best practice is to use separate IP addresses for the SPBM IP Shortcuts ip-source-address command and the Fabric Extend ip-tunnel-source-address command. However, if you want these IP addresses to be the same, you MUST exclude the ip-source-address address with an IS-IS accept policy. You cannot use the redistribute command with a route map exclusion.
Specify a CLIP interface to use as the source address for SPBM IP shortcuts.
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If IP Shortcuts is enabled, you must configure an IS-IS accept policy or exclude route-map to ensure that tunnel destination IP addresses are not learned through IS-IS.
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Configure a CLIP and tunnel source IP address on the VRF.
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Remote management of the VSP 4450 Series is only possible after establishing IP Shortcut over IS-IS. (Alternatively, you can enable GRT-VRF redistribution locally.)
About this task
Configuring Fabric Extend 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.
The VSP 4450 Series source address command is different from other platforms. Also note that the logical interface commands are different between Layer 2 and Layer 3 networks.
![Note](images/note.png)
Note
VRF is an optional parameter. If a VRF is not configured, then FE uses the GRT.
Procedure
The following steps are for platforms that support FE natively:
The following steps are for platforms that require an ONA to support FE:
![Note](images/note.png)
Note
The interface VLAN connecting to the ONA network port is always in the GRT and the member port that the VLAN is part of is always an access port.
Variable Definitions
The following table defines parameters for the ip-tunnel-source-address command.
Variable |
Value |
---|---|
<A.B.C.D> |
Specifies the IS-IS IPv4 tunnel source address, which can be a brouter interface IP, a CLIP IP, or a VLAN IP. |
overlay |
Permits the configuration of the tunnel source address even though it belongs to a VRF with an attached I-SID. |
port <slot/port> Note:
Exception: only supported on VSP 4450 Series. |
Specifies the port that is connected to the ONA device port. |
vrf WORD<1–16> |
Specifies the VRF name associated with the IP tunnel. |
mtu <mtu_value> Note:
Exception: only supported on VSP 4450 Series. |
Specifies the Maximum Transmission Unit (MTU) size for each packet. Different hardware platforms support different MTU ranges. Use the CLI Help to see the available range for the switch. This parameter only applies to an ONA configuration. |
The following tables define parameters for the logical-intf isis command, depending on whether you have a Layer 2 or Layer 3 core.
Variable |
Value |
---|---|
<1–255> |
Specifies the index number that uniquely identifies this logical interface. |
port {slot/port[/sub-port] [-slot/port[/sub-port]] [,...]} |
Specifies the physical port that the logical interface is connected to in a Layer 2 network. |
vid <list of vids> |
Specifies the list of VLANs that are associated with this logical interface. |
primary-vid <2–4059> |
Specifies the primary tunnel VLAN ID associated with this Layer 2 IS-IS logical interface. |
mlt <mltId> |
Specifies the MLT ID that the logical interface is connected to in a Layer 2 network. |
name WORD<1–64> |
Specifies the administratively-assigned name of this logical interface, which can be up to 64 characters. |
mtu<750-9000> Note:
Exception: only supported on XA1400 Series. |
Specifies the Maximum Transmission Unit (MTU) size of each packet. The default MTU value is 1950. |
Variable |
Value |
---|---|
<1–255> |
Specifies the index number that uniquely identifies this logical interface. |
dest-ip <A.B.C.D> |
Specifies the tunnel destination IP address of the remote BEB. |
name WORD<1–64> |
Specifies the administratively-assigned name of this logical interface, which can be up to 64 characters. |
mtu<750-9000> Note:
Exception: only supported on XA1400 Series. |
Specifies the Maximum Transmission Unit (MTU) size of each packet. The default MTU value is 1950. |