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3-17
Cisco MDS 9000 Family Troubleshooting Guide
OL-5183-02, Cisco MDS SAN-OS Release 1.3
Chapter 3 Troubleshooting Switch Level Issues and Interswitch Connectivity
Troubleshooting Fx Port Connectivity
Service Options: 0x0(Class Not Supported)
Vendor Version: 00000000000000000000000000000000
If the FLOGI is received by the switch, but the port is still not coming up, further investigation is needed
to determine if the FLOGI is rejected by the switch (i.e. still using the fcanalyzer) or the cause is a
misbehaving host, a broken fiber or a flappy connection between the end device and the Fx port on the
switch. (If an Nx port is considered faulty by the driver/firmware or the ASIC used on the HBA, it can be
configured to be in optical bypass. This results in the RX and TX paths being internally connected in the
loopback by the on-board circuitry. If this happens, the switch port connected to the faulty device will reach
bit and word synchronization with itself. If the port is configured in auto mode, this will cause the port to issue
an ELP and try to initialize as a TE/E Port, even if an end device is physically connected to that interface. In
this case a port reason code of isolation due to ELP failure, can show up even if an ISL is not present. To fix
the issue, one possible approach is to reset the HBA or changing it if the problem persists.)
Point-to-point link comes up as FL_Port
If a point-to-point link comes up as a FL port, it could be caused by any of the following issues.
The switch port could be configured as either an autodetect port, or forced to be F port. In order to verify
the actual configuration of the port, again the show interface command can be used:
switch#show interface fc7/5
fc7/5 is up
Hardware is Fibre Channel
Port WWN is 20:4d:00:05:30:00:18:a2
Admin port mode is auto, trunk mode is on
Port mode is F, FCID is 0x660000
Port vsan is 1
Speed is 1 Gbps
Receive B2B Credit is 16
Receive data field size is 2112
Beacon is turned off
5 minutes input rate 256 bits/sec, 32 bytes/sec, 0 frames/sec
5 minutes output rate 256 bits/sec, 32 bytes/sec, 0 frames/sec
369288 frames input, 11823952 bytes, 0 discards
0 CRC, 0 unknown class
0 too long, 0 too short
369288 frames output, 11826732 bytes, 0 discards
1 input OLS, 0 LRR, 2 NOS, 0 loop inits
3 output OLS, 3 LRR, 1 NOS, 0 loop inits
An alternative way to get the same information and also the information about the configured speed is
to use the following command.
switch# show port internal info interface fc7/5
The second line of the long output generated by the command shows the administrative status of the port
(that reflect what configured by the administrator on the switch).
For example, issuing the command on a switch interface fc7/5 where a no shutdown command has been
issued and where the port mode has been configured to be auto-detected, with speed auto-negotiation
enabled and trunking capabilities enabled, the following output is displayed:
switch# show port internal info interface fc7/5
fc7/5 - if_index: 0x 1304000, phy_port_index: 0x84
Admin Config - state(up), mode(auto), speed(auto), trunk(on)
beacon(off), snmp trap(on), tem(false)
rx bb_credit(default), rx bb_credit multiplier(default)
rxbufsize(2112), encap(default), user_cfg_flag(0x1)
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