Cisco GigaStack WS-X3500-XL Hardware Installation Manual page 48

Table 3-1 Common Problems and Their Solutions (continued)
Symptom
GigaStack GBIC
LED blinks any
color for more than
1 minute.
GigaStack GBIC
LED color is
incorrect (for
example, the GBIC
is not connected to
another device, but
the LED is green).
Catalyst GigaStack Gigabit Interface Converter Hardware Installation Guide
3-2
Possible Causes
Link flap (the link keeps
going up and down).
The GigaStack GBIC is in
an indeterminate state.
Corrective Action
Remove and reinsert the GigaStack GBIC.
Upgrade all the switches in a series to the same
software version; otherwise, the loop-breaking
algorithm might never resolve itself. For example,
if the stack includes only Catalyst 2900 series XL
and 3500 series XL switches, they must run
Release 12.0(5)XU or later. If the stack includes a
mixture of Catalyst 2900 series XL,
3500 series XL, 2950, and 3550 switches, all the
2900 XL and 3500 XL switches must run
Release 12.0(5)XW or later, all Catalyst 2950
switches must run Release 12.1(6)EA2 or later,
and all Catalyst 3550 switches must run
Release 12.1(4)EA1 or later.
If no loop exists in the GigaStack GBIC stack, you
can disable the loop-breaking algorithm by using
the no gigastack loop-breaking [interface-id]
global configuration command.
Remove and reinsert the GigaStack GBIC.
Chapter 3 Troubleshooting
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