Configure Fabric Extend Tunnels

Use the following procedure to configure the tunnel source address on a Fabric Extend (FE) tunnel. A typical deployment would be between a Main office and a Branch office.

You can also configure an optional parallel tunnel between the same two nodes to create a backup Fabric Extend adjacency. For more information, see Configure Fabric Extend Logical Interfaces.

Before you begin

If using the tunnel originating address, the logical interface 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
  
  To configure Fabric Extend using a tunnel source IP address on the GRT, use separate IP addresses for the SPBM IP Shortcuts (IpSourceAddress) and the Fabric Extend IpTunnelSourceAddress address. Exclude the IpSourceAddress address with an IS-IS accept policy if you want these IP addresses to be the same. You cannot use the redistribute command with a route-map exclusion.
  
  Specify a CLIP interface to use as the IpSourceAddress for SPBM IP shortcuts.
- If you enable IP Shortcuts, you must configure an IS-IS accept policy or use an exclude route-map to ensure that tunnel destination IP addresses are not learned through IS-IS.
- 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, configure a CLIP and tunnel source IP address on the VRF.

About this task

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

Note

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

Important

Switches that support a single active VRF have feature interactions with Fabric Extend. For more information, see the Configuration Rules in the VRF feature content. To assist with the single-active VRF restrictions, an overlay parameter is available for the IP tunnel source address configuration.

Procedure

In the navigation pane, expand Configuration > Fabric.
Select IS-IS.
Select the Globals tab.
For IpTunnelSourceAddress, type the IP tunnel source address.
Optional: For IpTunnelVrf, select the VRF.
Select Apply.

What to do next

Configure Fabric Extend Logical Interfaces

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, you must change the nickname when you change the system ID. If you want 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, in seconds. 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 the IS-IS system name. This can be used as the host name for dynamic host name exchange in accordance with RFC 2763. By default, the system uses the global system name as the IS-IS system name, until you manually configure it. Also, the system does not save the global system name in the running configuration on the switch.
IpSourceAddress	Specifies IP source address for SPBM IP shortcuts.
Ipv6SourceAddress	Specifies IPv6 source address for SPBM IP shortcuts.
IpTunnelSourceAddress	Specifies the IS-IS IPv4 tunnel source address.
IpTunnelVrf	Specifies the VRF name associated with the IP tunnel.
IpTunnelOverlay	Permits the configuration of the tunnel source address even though it belongs to a VRF with an attached I-SID. The default is disabled.
DesignatedBNHostName Note: Exception: only applies to 5520 Series, 5720 Series, 7520 Series, and 7720 Series.	Specifies the hostname of the designated boundary node.
DesignatedBNHomeSystemId Note: Exception: only applies to 5520 Series, 5720 Series, 7520 Series, and 7720 Series.	Specifies the system ID of the designated boundary node in the home area.
DesignatedBNRemoteSystemId Note: Exception: only applies to 5520 Series, 5720 Series, 7520 Series, and 7720 Series.	Specifies the system ID of the designated boundary node in the remote area.
MgmtClipIpAddr	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	Specifies whether the node is a member of the Fabric Area Network (FAN) .
DynamicallyLearnedArea	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 applies to 5520 Series, 5720 Series, 7520 Series, and 7720 Series.	Specifies the Multi-area SPB operational state. The default is disabled.
HelloPadding	Configures IS-IS hello padding on all IS-IS network-to-network interface (NNI) links. IS-IS hello padding is enabled by default. IS-IS logical-interfaces with a configured IS-IS MTU do not perform IS-IS Hello Padding, regardless of the global IS-IS Hello Padding configuration.
MAHomeAlwaysUp Note: Exception: only applies to 5520 Series, 5720 Series, 7520 Series, and 7720 Series.	Specifies the Multi-area SPB as a boundary node to forward traffic from the UNIs to the remote-area and from the remote-area to the UNIs without requiring an established adjacency in the home area. The default is disabled.