Network: Troubleshooting
Intended for use with Cassatt Active Response V5.0.
The following material outlines problems you may encounter with your system's network, along with the steps to solve those problems.
BladeCenter’s internal network interfaces in "err-disabled" state
Description
Autonegotiation causes the BladeCenter’s internal network interfaces to be put in a disabled state.
Resolution
Autonegotiation, which allows the simple, automatic connection
of network devices, causes the interface on the BladeCenter's
Cisco intelligent Gigabit Ethernet Switch
Module (iGESM) modules to be put
in an "err-disabled" state
when the link changes state rapidly in a short interval. This
rapid change is known as link flapping, which can be caused
by autonegotiation timing issues, bad cables, and bad interfaces.
The following procedure shows how to fix this issue on the
switches:
- Log into the BCMM.
- Select the "Management" link under I/O Module Tasks.
- Select the "Advanced Management" link under the Bay 1 ESM.
As an alternative to accessing the switch via the BCMM software, you can also telnet directly into the IP address for each switch shown in step 2.
- Select the "Start Telnet Session" button near the bottom of the page.
- A new window appears with a telnet login prompt. Use the IBM
default supplied user ID and password unless the login
has been changed from the default. The default user ID
and password are USERID and PASSW0RD, where 0 is a zero and not a capital
O.
- Enter the following :
conf t
no errdisable detect cause link-flap
Control + Z
write mem
exit
- Close the telnet window to the switch.
- Repeat steps 3-7 for each iGESM in BladeCenter chassis.
In addition, you will need to clear any interfaces that were disabled due to the link flapping. To do that, run the following commands when logged into the switch module:
config terminal
interface range GigabitEthernet0/1 - 14
shutdown
no shutdown
exit
exit
show interfaces status err-disabled
(no ports should be listed)
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