HP StorageWorks 8/80 Brocade Fabric OS Troubleshooting and Diagnostics Guide v - Page 33
Connectivity Issues, In this Port initialization and FCP auto discovery process
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Connectivity Issues Chapter 3 In this chapter •Port initialization and FCP auto discovery process 19 •Link issues 21 •Connection problems 21 •Link failures 24 •Marginal links 26 •Device login issues 29 •Media-related issues 31 •Segmented fabrics 33 Port initialization and FCP auto discovery process The steps in the port initialization process represent a protocol used to discover the type of connected device and establish the port type and port speed. The possible port types are as follows: • U_Port-Universal FC port. The base Fibre Channel port type and all unidentified, or uninitiated ports are listed as U_Ports. • L_/FL_Port-Fabric Loop port. Connects public loop devices. • G_Port-Generic port. Acts as a transition port for non-loop fabric-capable devices. • E_Port-Expansion port. Assigned to ISL links. • F_Port-Fabric port. Assigned to fabric-capable devices. • EX_Port-A type of E_Port. It connects a Fibre Channel router to an edge fabric. From the point of view of a switch in an edge fabric, an EX_Port appears as a normal E_Port. It follows applicable Fibre Channel standards as other E_Ports. However, the router terminates EX_Ports rather than allowing different fabrics to merge as would happen on a switch with regular E_Ports. • M_Port-A mirror port. A mirror port lets you configure a switch port to connect to a port to mirror a specific source port and destination port traffic passing though any switch port. This is only supported between F_Ports. • VE_Port-A virtual E_Port. A Gigabit Ethernet switch port configured for an FCIP tunnel is called a VE port (virtual E-port). However, with a VEX_Port at the other end it does not propagate fabric services or routing topology information from one edge fabric to another. Fabric OS Troubleshoot and Diagnostics Guide 19 53-1001340-01