From a user's perspective, these settings are not really negotiated, but rather are enabled using autonegotiation.
The SFPs for Gigabit Ethernet SPAS support 1000Base-X, and the IEEE 1000Base-X standard for fiber does
not support negotiation of link speed.
To disable autonegotiation, use the following command in interface configuration mode:
Purpose
Command
Disables autonegotiation on Fast Ethernet or Gigabit
Ethernet SPA interfaces on the Cisco
ASR1000-SIP10. No advertisement of flow control
occurs.
Router(config-if)#
no negotiation auto
Configuring Speed and Duplex
When autonegotiation is turned off on Fast Ethernet or the RJ-45 interface in the 2-Port Gigabit Ethernet SPA,
you can manually specify the speed and duplex configuration.
When using the SFP-GE-T, you must configure both the speed and duplex modes.
Note
On the Cisco ASR 1002-X Router, the copper SFP port's flow control is on, regardless of the duplex
setting. In contrast, on the Cisco ASR 1002 Router, the copper SFP port's flow control is off when the
duplex setting is Half.
Note
To configure the speed for a Fast Ethernet or Gigabit Ethernet interface, use the
speed
command in interface
configuration mode. To return to the default setting, use the
no
form of this command:
Purpose
Command
Configures the interface to transmit at 10 Mbps, 100
Mbps, or 1000 Mbps. (The
1000
keyword is only
valid for Gigabit Ethernet.)
Router(config-if)#
speed
{
10
|
100
|
1000
}
To configure duplex operation on an interface, use the
duplex
command in interface configuration mode. Use
the
no
form of this command to return to the default value.
Purpose
Command
Specifies full- or half-duplex operation.
Router(config-if)#
duplex
{
full
|
half
}
Configuring the Media Type
The 2-Port Gigabit Ethernet SPA supports RJ-45 and fiber ports. Use the
media-type
configuration command
to select either the RJ-45 or fiber media for a given port.
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS
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Configuring the Ethernet SPAs
Configuring the Autonegotiation on an Interface