Link Failures - Brocade Communications Systems A7533A - Brocade 4Gb SAN Switch Base Troubleshooting Manual

2. Look for the device in the NS list, which lists the nodes connected to that switch. This allows
3. Enter the portLoginShow command to check the port login status.
4. Enter the fcpProbeShow command to display the FCP probing information for the devices
5. Check the port log to determine whether or not the device sent the FLOGI frame to the switch,

Link failures

A link failure occurs when a server, storage, or switch device is connected to a switch, but the link
between the devices does not come up. This prevents the devices from communicating to or
through the switch.
If the switchShow command or LEDs indicate that the link has not come up properly, use one or
more of the following procedures.
The port negotiates the link speed with the opposite side. The negotiation usually completes in one
or two seconds; however, sometimes the speed negotiation fails.
NOTE
Skip this procedure if the port speed is set to a static speed through the portCfgSpeed command.
Fabric OS Troubleshooting and Diagnostics Guide
53-1001187-01
FC4s: FCP [SEAGATE ST318304FC
Fabric Port Name: 20:0e:00:60:69:10:9b:5b
NL 051ee8; 3;21:00:00:20:37:d9:6f:eb;20:00:00:20:37:d9:6f:eb; na
FC4s: FCP [SEAGATE ST318304FC
Fabric Port Name: 20:0e:00:60:69:10:9b:5b
NL 051eef; 3;21:00:00:20:37:d9:77:45;20:00:00:20:37:d9:77:45; na
FC4s: FCP [SEAGATE ST318304FC
Fabric Port Name: 20:0e:00:60:69:10:9b:5b
N 051f00; 2,3;50:06:04:82:bc:01:9a:0c;50:06:04:82:bc:01:9a:0c; na
FC4s: FCP [EMC
Fabric Port Name: 20:0f:00:60:69:10:9b:5b
you to determine if a particular node is accessible on the network.
•
If the device is not present in the NS list, the problem is between the device and the
switch. There may be a time-out communication problem between edge devices and the
name server, or there may be a login issue. First check the edge device documentation to
determine if there is a time-out setting or parameter that can be reconfigured. Also, check
the port log for NS registration information and FCP probing failures (using the
fcpProbeShow command). If these queries do not help solve the problem, contact the
support organization for the product that appears to be inaccessible.
•
If the device is listed in the NS, the problem is between the storage device and the host.
There may be a zoning mismatch or a host/storage issue. Proceed to
Issues".
attached to the specified F_Port or L_Port. This information includes the number of successful
logins and SCSI INQUIRY commands sent over this port and a list of the attached devices.
and the switch probed the device.
0005]
0005]
0005]
SYMMETRIX 5267]
3

Link failures

Chapter 9, "Zone
25