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Enhanced FIPS Snooping Bridge (E-FSB) Disclosure Number: IPCOM000238092D
Publication Date: 2014-Aug-01
Document File: 4 page(s) / 142K

Publishing Venue

The Prior Art Database


Disclosed is a solution that enhances the FIP snooping bridge(FSB) by adding the routing capabilities so that the Fibre Channel Over Ethernet(FCoE) traffic takes the shortest path between two end nodes resulting in reduced traffic latency and optimal bandwidth provisioning

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Enhanced FIPS Snooping Bridge (E-FSB)

In Data Centre Bridge Networks, involving FCoE nodes, the FCoE traffic between end nodes(enodes) has to traverse a longer path through each switch(FSB) between FCF and the enodes. This happens even if the enodes are connected directly to the same switch(FSB). This introduces latency as well as requires higher bandwidth provisioning for the involved L2 links. As far as we are aware, there are no available solutions which handle this problem in the Fibre Channel Backbone 5 (FC-BB5) based deployments. There is a solution[1], based on FC-BB6, which supports VN_port to VN_port connectivity. This design requires the end points(vn_ports) to have the intelligence to talk to peer VN_port directly. Our proposal doesn't depend on FC-BB6 i.e., VN_ports to VN_ports link. It works with FC-BB5 and is applicable to existing infrastructure in Data Centres based on FC-BB5. It introduces intelligence in the FSB access switches so the traffic between VN_ports is routed directly without the need to be forwarded to FCF.

Disclosed solution adds FCoE routing capabilities to the FSB, called, Enhanced FIP Snooping Bridge(E-FSB). With E-FSB, the FCoE traffic between e-nodes takes the shortest path available.

Fig. 1

The figure 1 depicts an example of FCoE traffic flow between a host and target under existing SAN paradigm. Hosts/targets in FCoE network are connected to FCF/NPV through access switches which function as FIP snooping bridges(FSB). The traffic is routed by the Fibre Channel Forwarder(FCF) even though the host and target are connected to the common FSB switch.

FCoE data traffic needs to traverse all hops of L2 network even if Host and target are connected


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to same FSB, for example, consider figure 2, traffic from T1 to H1 has to traverse from Fn to F1 and back to Fn, a total of (2 x n) hops as shown in figure 2.

The FCoE routing dependency on FCF creates bottleneck, adds...