IBM 12.1(22)EA6 User Manual
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.
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.
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).
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).
(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).
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)
Aggregation Control Protocol (LACP)
Disabled on all Ethernet ports. See
Port blocking—unknown multicast and
unknown unicast traffic
unknown unicast traffic
Disabled (not blocked).
Broadcast, multicast, and unicast storm
control
control
Disabled. See the
.
Protected port
Disabled. See the
Port security
Disabled. See the
.
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