High System ID – > 48 bit VDC MAC Address.

High Root Priority -> 8 Bit value(default=64).

Fabric Path automatically builds two separate logical tree or Multi destination tree for handling Mutidestination traffic.like spanning-tree, each tree has a root that is chosen automatically based on below criteria. Multidestination traffic can be mutlicast, broadcast and unknown unicast. when frame leaves the fabric path network to go to CE N/W the egressing switch de-encapsulates the frame and sends as regular CE header. No MAC learning or lookup required inside the core and traffic forwarding is done based on switch id. When a frame enters to fabric path domain from CE Network, the ingressing switch encapsulates the frame with a fabric path header.

DRAP: Dynamic resource allocation Protocol an extension to fabric path IS-IS that ensures network wide unique and consistent switch id and.

for verification and troubleshooting recommended to manually assign the switch id using fabricpath switch-id command.

Switch id can be assinged dynamically or statically.

Switch id is 12 bit address that represent the switch inside fabric path topology.

Fabric leaf switch must be Root for Classical Ethernet Domain,.

Basically leaf switch connect CE domain to Fabric Path domain.

Forward traffic only based on the switch id.Devices at the core of the fabricpath topology.Exchange topology info through L2 IS-IS adjacency.Forward traffic based on “Switch-Id Table.A Port which is configured with command.Link on leaf up to spine or spine to spine.

Port which is connected to another fabric path devices.Forward traffic based on MAC address Table.Sends/receives Traffic based in standard Ethernet frame Format.A Port which is not configured with command.An interface which is connected to traditional N/W device.Sync Mac Table means MAC address Table can’t be scaled.Īsync Tables means Mac address table will be scaled or optimized using conversational MAC learningĬE(Classical Ethernet):- Regular Ethernet with regular STP. STP introduce sub-optimal path means shortest path may not be used STP provides limited bandwidth (no load balancing by default) This is accomplished using IS-IS protocol. In Fabric Path each device in topology is identified by switch id and all layer 2 forwarding tables are built based on reachability to each switch id. Fabric Path is a plug and play protocol, it enables each device to build overall view of topology in same way like link state protocol does.

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