IBM 12.1(22)EA6 - Manual (Page 152)

7-10
Cisco Systems Intelligent Gigabit Ethernet Switch Modules for the IBM BladeCenter, Software Configuration Guide
24R9746
Chapter 7 Configuring Interface Characteristics
Configuring Ethernet Interfaces
Configuring Interface Speed and Duplex Mode
By default, the non-SFP module external ports (ports 17 to 20) are set to autonegotiate in speed and
duplex mode. Depending on the switch model, you can change the speed and duplex settings of the
external ports. The internal Gigabit Ethernet ports (ports 1 to 14) operate only at 1000 Mbps, full duplex.
The internal 100 Mbps management module ports (ports 15 and 16) operate only at 100 Mbps, full
duplex. You cannot configure the speed and duplex mode on the internal ports.
In full-duplex mode, two stations can send and receive at the same time. When packets can flow in both
directions simultaneously, effective Ethernet bandwidth doubles to 20 Mbps for 10-Mbps interfaces,
to 200 Mbps for Fast Ethernet interfaces, and to 2 Gbps for Gigabit Ethernet interfaces. Full-duplex
communication is often an effective solution to collisions, which are major constrictions in Ethernet
networks. Normally, 10-Mbps ports operate in half-duplex mode, which means that stations can either
receive or send.
Port description blade n for the internal 1000 Mbps ports (ports 1 to 14).
mgmt 1 or 2 for the internal 100 Mbps management module
ports (ports 15 and 16).
extern n for the external ports (ports 17 to 20).
Speed 1000 for the internal 1000 Mbps ports (ports 1 to 14).
100 for the internal 100 Mbps management module ports
(ports 15 and 16).
Autonegotiate for the external ports (ports 17 to 20).
The speed on the internal ports is nonconfigurable.
Duplex mode Full duplex for the internal 1000 Mbps ports (ports 1 to 14).
Full duplex for the internal 100 Mbps management module
ports (ports 15 and 16).
Autonegotiate for the external ports (ports 17 to 20).
The duplex mode on internal ports is nonconfigurable.
EtherChannel (PAgP) and Link
Aggregation Control Protocol (LACP) Disabled on all Ethernet ports. See Chapter 24, “Configuring
EtherChannels and Layer 2 Trunk Failover.”
Port blocking—unknown multicast and
unknown unicast traffic Disabled (not blocked).
Broadcast, multicast, and unicast storm
control Disabled. See the “Default Storm Control Configuration”
section on page 15-2 .
Protected port Disabled. See the “Configuring Protected Ports” section on
page 15-3 .
Port security Disabled. See the “Default Port Security Configuration”
section on page 15-6 .
Port Fast Enabled on ports 1 to 14.
Disabled on ports 15 to 20.
Media Type SFP module preferred.
Table 7-1 Default Ethernet Interface Configuration (continued)
Feature Default Setting