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In transit mode, all the incoming traffic is mapped to one internal bridge-domain (VLAN). A pure Layer 2 spine node does not learn the MAC addresses; however, the packet is switched based on the switch ID lookup table in the FabricPath header.
In a FabricPath network, the Layer 2 spine node can be configured in Transit mode. After the spine is configured in the Transit mode, uni-destination traffic received on the spine is forwarded based on the FTAG (forwarding tag) and destination switch ID. For multi-destination traffic, the traffic on the spine is forwarded based on FTAG, which is the identifier of the multi-destination traffic that is selected by the ingress switch.
The spine will forward all the fabric-path data for all VLANs. For any other traffic, for example, carrier ethernet ports or SVI or Layer 3-specific data, processing is dependent on the SVI or Layer 3 configuration, based on SVI enabled on the spine switch.
The following are the guidelines and limitations for configuring FabricPath in Transit mode:
To configure the FabricPath in transit mode, perform the following.
Step 1 Enter the global configuration mode:
Step 2 Install the FabricPath feature set on the switch.
Step 3 Enables the FabricPath feature set on the switch.
Step 4 Configure the FabricPath in transit mode:
Step 5 Copy and save the running configuration to the startup configuration.
Step 6 Reload the spine for transit mode to take effect.
This example shows a running configuration, followed by a verification command that displays the configuration details for Cisco FabricPath in Transit Mode.
The following is the output for the show fabricpath mode command.
The following table lists the release history for these features.
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