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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Configuring Backup Data Lines and Remote Management
Configuring Backup Interfaces
Configuring Gigabit Ethernet Failover Media
Cisco 2921, Cisco 2951, and Cisco 3900 Series routers provide a Gigabit Ethernet (GE)
small-form-factor pluggable (SFP) port that supports copper and fiber concurrent connections. Media
can be configured for failover redundancy when the network goes down.
Note Do not connect back-to-back Cisco 2921, Cisco 2951, or Cisco 3900 Series routers with failover or as
auto-detect configured. This is not a supported configuration and the behavior is unpredictable.
Assigning Primary and Secondary Failover Media
To assign primary and secondary failover media on the GE-SFP port, follow these steps, beginning in
EXEC mode.
SUMMARY STEPS
1. configure terminal
2. interface gigabitethernet slot/port
3. media-type sfp
4. media-type sfp auto-failover
5. end
DETAILED STEPS
Command Purpose
Step 1
configure terminal
Example:
Router> enable
Router# configure terminal
Router(config)#
Enters global configuration mode, when using
the console port.
Use the following commands to connect to the
router with a remote terminal:
telnet router name or address
Login: login id
Password: *********
Router> enable
Step 2
interface gigabitethernet slot/port
Example:
Router(config)# interface gigabitethernet 0/1
Router(config-if)#
Enters interface configuration mode.
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