Cisco Cisco 1000BASE-T SFP Fehlerbehebungsanleitung

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. 

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

 for more information. 

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 

Cisco Downloads

 (

registered

 customers only) . This issue is documented 

at Cisco bug 

CSCsc04961

 (

registered

 customers only) . 

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