Configure Fabric Extend Tunnels

Use the following procedure to configure Fabric Extend (FE) between a Main office to a Branch office. This 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.

Note

VRF is an optional parameter. If a VRF is not configured, then FE uses the GRT.

Before you begin

The tunnel source IP address can be either a brouter port IP, a CLIP IP, or a VLAN IP.

Note

Product Notice: Except VSP 8600 Series, all product series support a VLAN IP as the Fabric Extend tunnel source IP address.

If using the tunnel originating address on the GRT, Fabric Extend has the following requirements:

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.
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.

If you are using the tunnel originating address on a VRF, Fabric Extend has the following requirements:

Configure a CLIP and tunnel source IP address on the VRF.
Remote management of the VSP 4450 Series is 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.

Note that the VSP 4450 Series source address command is different than other platforms. Also note that the logical interface commands are different between Layer 2 and Layer 3 networks.

Procedure

The following steps are for platforms that support FE natively:

In the navigation pane, expand Configuration > IS-IS.
Select IS-IS.
Select the Globals tab.
In the IpTunnelSourceAddress field, enter the IP tunnel source address.
If you are using a VRF, select IpTunnelVrf field.
Select Apply.

The following steps are for platforms that require an ONA to support FE:

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.

In the navigation pane, expand Configuration > IS-IS.
Select IS-IS.
Select the Globals tab.
In the IpTunnelSourceAddress field, enter the IP tunnel source address.
In the IpTunnelPort field, select the physical port that the logical interface is connected to in an Layer 2 network.
If you are using a VRF, select its name from the list for IpTunnelVrf.
In the IpTunnelMtu field, enter a value between 750 and 1950 to specify the size of the maximum transmission unit (MTU).
Select Apply.

Globals Field Descriptions

Use the data in the following table to use the Globals tab.


Name	Description
AdminState	Specifies the global status of IS-IS on the switch: on or off. The default is off.
LevelType	Sets the router type globally: level1: Level-1 router type level1and2: Level–1/2 router type is not supported. The default value is level1.
SystemId	Specifies the IS-IS system ID for the switch. Valid value is a 6–byte value in the format <xxxx.xxxx.xxxx>. Important: After you have configured the SPBM nickname and enabled IS-IS, if you require a change of the system ID, you must also change the nickname. However, for naming convention purposes or configuration purposes, you may not want to change the nickname. To maintain the same nickname with a different system ID, see Job aid.
MaxLspGenInt	Specifies the maximum interval, in seconds, between generated LSPs by this Intermediate system. The value must be greater than any value configured for RxmtLspInt. The default value is 900 seconds.
CsnpInt	Specifies the Complete Sequence Number Packet (CSNP) interval in seconds. This is a system level parameter that applies for L1 CSNP generation on all interfaces. The default value is 10.
RxmtLspInt	Specifies the minimum time between retransmission of an LSP. This defines how fast the switch resends the same LSP. This is a system level parameter that applies for L1 retransmission of LSPs. The default value is 5 seconds.
PSNPInterval	Specifies the Partial Sequence Number Packet (PSNP) interval in seconds. This is a system level parameter that applies for L1 PSNP generation on all interfaces. The default value is 2.
SpfDelay	Specifies the SPF delay in milliseconds. This value is used to pace successive SPF runs. The timer prevents two SPF runs from being scheduled very closely. The default value is 100 milliseconds.
HostName	Specifies a name for the system. This can be used as the host name for dynamic host name exchange in accordance with RFC 2763. By default, the system name comes from the host name configured at the system level.
IpSourceAddress	Specifies IP source address for SPBM IP shortcuts.
Ipv6SourceAddress	Specifies IPv6 source address for SPBM IP shortcuts.
IpTunnelSourceAddress Note: Exception: Not supported on VSP 8600 Series.	Specifies the IS-IS IP tunnel source address.
IpTunnelVrf Note: Exception: Not supported on VSP 8600 Series.	Specifies the VRF name associated with the IP tunnel.
MgmtIpAddr Note: Exception: Not supported on VSP 8600 Series.	Specifies the DvR management IP address for this node, in the DvR domain.
BackboneEnable	Select to enable this node to join the DvR backbone so that it can receive redistributed DvR host routes from all DvR Controllers in the network.
FanMember Note: Exception: Not supported on VSP 8600 Series.	Specifies whether the node is a member of the Fabric Area Network (FAN) .
DynamicallyLearnedArea Note: Exception: Not supported on VSP 8600 Series.	For FAN members, specifies the IS-IS area that is dynamically learned from the neighbor‘s Hello PDU if the node does not have the IS-IS manual area configured.
MAOperState Note: Exception: Only supported on VSP 7400 Series.	Specifies the Multi-area SPB operational state. The default is disabled.
HelloPadding Note: Exception: Not supported on VSP 8600 Series.	Configures IS-IS hello padding on all IS-IS NNI links. IS-IS hello padding is enabled by default.