Multifabric Communication Using a Backbone Fabric

Abstract

A Fibre Channel router used to join fabrics. EX_ports are used to connect to the fabrics. The EX_port joins the fabric but the router will not merge into the fabric. Ports in the Fibre Channel router can be in a fabric, but other ports can be connected to other fabrics. Fibre Channel routers can be interconnected using a backbone fabric. Global, interfabric and encapsulation headers are developed to allow routing by conventional Fibre Channel switch devices in the backbone fabric and simplify Fibre Channel router routing. Phantom domains and devices must be developed for each of the fabrics being interconnected. Front phantom domains are present at each port directly connected to a fabric. Each of these is then connected to at least one translate phantom domain. Zoning is accomplished by use of a special LSAN zoning naming convention. This allows each administrator to independently define devices are accessible.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of co-pending U.S. patent application Ser. No. 10 / 903,471, entitled “Multifabric Communication Using a Backbone Fabric,” by Dennis Makishima and Daniel Chun and filed Jul. 30, 2004, which is hereby incorporated by reference.[0002]This application is also related to U.S. patent application Ser. Nos. 10 / 903,877, entitled “Multifabric Zone Device Import and Export,” by Daniel Chung and Dennis Makishima; 10 / 909,277, entitled “Multifabric Global Header,” by Steve Wilson, Robert Snively, Ed McClanahan, Dennis Makishima and Daniel Chung; 10 / 903,899, entitled “Interfabric Routing Header for Use with a Backbone Fabric,” by Robert Snively, Steve Wilson, Ed McClanahan, Dennis Makishima and Daniel Chung; and 10 / 903,499 (now U.S. Pat. No. 7,466,712), entitled “System and Method for Providing Proxy and Translation Domains in a Fibre Channel Router,” by Dennis Makishima and Daniel Chung, all hereby incorporated by refe...

AI Technical Summary

Benefits of technology

[0010]A Fibre Channel router according to the present invention can be used to join isolated Fibre Channel fabrics to allow greater interconnection of devices and overall improved manageability of the entire network. In a first embodiment the Fibre Channel router contains EX_ports to connect to each of the existing fabrics. The EX_port is a new port developed to have the port join the fabric but not to have the router itself merge into the fabric. Thus the Fibre Channel router can have ports that are members of multiple fabrics. The Fibre Channel router will translate addresses between the particular fabrics so that devices in the different fabrics can communicate.

[0013]One complexity arises because phantom or proxy domains and devices must be developed for each of the fabrics being interconnected, so that the devices on a particular fabric are not aware of the various translations which must occur. To this end, each Fibre Channel router has at least two domains that it develops. A first set of domains is the front phantom domains. These are domains present at each port directly connected to a fabric. Each of these front phantom domains is then connected to at least one translate phantom domain, there being one translate phantom domain for each particular fabric to which devices being translated are connected. The use of the front phantom domains for each connected port and a translate phantom domain for each connected fabric simplifies overall routing operations and provides redundancy and simplification of the software required.

Problems solved by technology

One complexity arises because phantom or proxy domains and devices must be developed for each of the fabrics being interconnected, so that the devices on a particular fabric are not aware of the various translations which must occur.

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