Catalyst Switches; Cisco Support Community - Featured Conversations - Cisco GLC-FE100FX Maintenance And Troubleshooting Manual

connectors can be active for a port and the active connector is determined by the interface configuration
command media-type {rj45 | sfp}.
In a WS-X4948 chassis, the last four ports (ports 45 to 48) are dual-mode capable.
Switch(config)#interface gigabitethernet 5/5
Switch(config-if)#media-type rj45
Enter the show interface capabilities command in order to provide the Multiple Media Types field, which
displays the value no if a port is not dual-mode capable and lists the media types (sfp and rj45) for dual-
mode capable ports.
SFP Interfaces of X2/Twin Gigabit Converter Do Not Come Up
The default configuration mode is X2, so, if you plan to deploy 10-Gigabit interfaces, you do not need to
configure anything. If you want to deploy Gigabit interfaces, that is, TwinGig Convertors, you must
configure the associated port-group.
First gather the information on how the X2 slots on a module are grouped. Then, to configure the modes of
operation for each X2 port group in which you want to deploy Gigabit, enter the hw-module module m
port-group p select gigabitethernet command. This configuration is preserved across power cycles and
reloads.
Refer to Selecting X2/TwinGig Convertor Mode
The Links Do Not Come Up in Cisco 3800 Series Routers with SPFs for Connecting to Cisco

Catalyst Switches

When the SFPs are used to connect a Cisco 3800 Series router to a Cisco Catalyst switch, the link cannot
come up, and the show interface command shows down/down.
In order to overcome this issue, enable autonegotiation on both the router and switch. In order to
permanently resolve the issue, upgrade the Cisco IOS software of the router to release 12.4(8) or later,
which can be downloaded from
at Cisco bug CSCsc04961 (registered

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customers only) . This issue is documented
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