Cisco Cisco Gigabit Ethernet GBIC SFP Modules

4 Release Notes for Catalyst GigaStack Gigabit Interface Converter

Caveats

Maximum GigaStack GBICs in a Daisy-Chain Configuration

The maximum number of GigaStack GBICs allowed in a daisy-chain configuration is nine.

Switch Software Requirement

To use the GigaStack GBIC

with a

3500 XL switch or 2900 XL modular switch, ensure that the

switch is running IOS version 11.2(8.1)SA6 or later. For software upgrade procedures, see the
Release Notes for Cisco IOS Release 11.2(8.1)SA6.

Caveats

Cable Insert Might Disable Traffic

With IOS Release 11.2(8.1), you might experience a problem with traffic flow in one direction when
you insert a cable. To determine if this problem exists, use the ping command on a station that is
located on one end of the stack to verify connectivity to a station on the other end of the stack.

If this problem exists, you can work around it by doing one of the following:

•

Remove the cable from the device and then reinsert it.

•

Enter the following command-line interface (CLI) commands on each switch in the stack that has
this problem:

Step 1

Enter the enable command to access privileged EXEC mode:

Switch> enable

Step 2

Enter global configuration mode by entering the configure t command:

Switch# config t

Step 3

Enter the interface command for the port that is not receiving traffic:

Switch(config)# interface Gix/x

where x is the port number that is not receiving traffic.

Step 4

Enter the duplex half command to set the duplex mode to half duplex:

Switch(config-if)# duplex half

Step 5

Wait for a few seconds. The link will come down and go back up.

Step 6

Enter the duplex auto command to set the duplex mode for autonegotiation:

Switch(config-if)# duplex auto

Step 7

Exit the configuration mode by using the end command:

Switch(config-if)# end

Documentation Correction

The Catalyst GigaStack Gigabit Interface Converter Installation Guide states that the GigaStack
GBIC LED turns amber if you use a cable other than GigaStack cables. This function has changed.
The LED remains dark if you use a cable other than the GigaStack cables.