Dell Brocade G620 Brocade 8.0.1 Fabric OS Troubleshooting and Diagnostics Guid - Page 35

Connectivity, Port initialization and FCP auto-discovery process

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Connectivity ∙ Port initialization and FCP auto-discovery process...35 ∙ Link issues...36 ∙ Connection problems...37 ∙ Link failures...39 ∙ Marginal links...41 ∙ Device login issues on Fabric switch...43 ∙ Device login issues on Access Gateway...45 ∙ Media-related issues...46 ∙ Segmented fabrics...47 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_Port/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 allows you to configure a switch port to connect to a port to mirror a specific source port and destination port traffic passing through 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. ∙ VEX_Port-A virtual EX_Port. It connects a Fibre Channel router to an edge fabric. From the point of view of a switch in an edge fabric, a VEX_Port appears as a normal VE_Port. It follows the same Fibre Channel protocol as other VE_Ports. However, the router terminates VEX_Ports rather than allowing different fabrics to merge as would happen on a switch with regular VE_Ports. Figure 2 shows the process behind port initialization. Understanding this process can help you determine where a problem resides. For example, if your switch cannot form an E_Port, you understand that the process never got to that point or does not recognize the switch as an E_Port. Possible solutions would be to look at licensing and port configuration. Verify that the correct licensing is installed or that the port is not configured as a loop port, a G_Port, or the port speed is not set. Brocade Fabric OS Troubleshooting and Diagnostics Guide 53-1004126-01 35

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Connectivity
∙
Port initialization and FCP auto-discovery process
......................................................................................................................................
35
∙
Link issues
.............................................................................................................................................................................................................................
36
∙
Connection problems
......................................................................................................................................................................................................
37
∙
Link failures
...........................................................................................................................................................................................................................
39
∙
Marginal links
.........................................................................................................................................................................................................................
41
∙
Device login issues on Fabric switch
.....................................................................................................................................................................
43
∙
Device login issues on Access Gateway
..............................................................................................................................................................
45
∙
Media-related issues
.......................................................................................................................................................................................................
46
∙
Segmented fabrics
............................................................................................................................................................................................................
47
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_Port/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 allows you to configure a switch port to connect to a port to mirror a specific source port
and destination port traffic passing through 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.
∙
VEX_Port—A virtual EX_Port. It connects a Fibre Channel router to an edge fabric. From the point of view of a switch in an
edge fabric, a VEX_Port appears as a normal VE_Port. It follows the same Fibre Channel protocol as other VE_Ports. However,
the router terminates VEX_Ports rather than allowing different fabrics to merge as would happen on a switch with regular
VE_Ports.
Figure 2
shows the process behind port initialization. Understanding this process can help you determine where a problem resides. For
example, if your switch cannot form an E_Port, you understand that the process never got to that point or does not recognize the switch
as an E_Port. Possible solutions would be to look at licensing and port configuration. Verify that the correct licensing is installed or that
the port is not configured as a loop port, a G_Port, or the port speed is not set.
Brocade Fabric OS Troubleshooting and Diagnostics Guide
53-1004126-01
35