Cisco Systems OL-8550-09 Configuration Guidelines for 10-Gigabit Ethernet Interfaces, Configuring Interface Speed and Duplex Mode

12-17
Catalyst 3750 SwitchSoftware Configuration Guide
OL-8550-09
Chapter12 Configuring Interface Characteristics
Configuring Ethernet Interfaces
Configuration Guidelines for 10-Gigabit Ethernet Interfaces
Follow these guidelines to avoid configuration problems:
•The speed and duplex features are not supported.
•The 10-Gigabit interfaces do not support these QoS features:
– Policing
– Auto-QoS for VoIP with Cisco IP Phones
– Servicing the egress queues by using shaped round robin (SRR) weights
– Limiting the bandwidth on an egress interface
•If a 10-Gigabit module port is configured as a SPAN or RSPAN destination port, its link rate
decreases.
•Support for a cross-stack EtherChannel with up to two 10-Gigabit module ports.
Configuring Interface Speed and Duplex Mode
Depending on the supported port types, Ethernet interfaces on the switch operate at 10, 100, or 1000
Mb/s, or 10,000 Mb/s and in either full- or half-duplex mode. In full-duplex mode, two stations can send
and receive traffic at the same time. Normally, 10-Mb/s ports operate in half-duplex mode, which means
that stations can either receive or send traffic.
Port blocking (unknown multicast
and unknown unicast traffic)
Disabled (not blocked) (Layer 2 interfaces only). See the
“Configuring Port Blocking” section on page25-8.
Broadcast, multicast, and unicast
storm control
Disabled. See the “Default Storm Control Configuration” section
on page 25-3.
Protected port Disabled (Layer 2 interfaces only). See the “Configuring Protected
Ports” section on page 25-6.
Port security Disabled (Layer 2 interfaces only). See the “Default Port Security
Configuration” section on page25-12.
Port Fast Disabled. See the “Default Optional Spanning-Tree
Configuration” section on page20-12.
Auto-MDIX Enabled.
Note The switch might not support a pre-standard powered
device—such as Cisco IP phones and access points that do
not fully support IEEE 802.3af—if that powered device is
connected to the switch through a crossover cable. This is
regardless of whether auto-MIDX is enabled on the switch
port.
Power over Ethernet (PoE) Enabled (auto).
Keepalive messages Disabled on SFP module ports; enabled on all other ports.
Table12-2 Default Layer 2 Ethernet Interface Configuration (continued)
Feature Default Setting