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Chapter 11
Configuring Interface Characteristics
When the EMI is running on the stack master, the switch supports two methods of forwarding traffic
between interfaces: routing and fallback bridging. If the SMI is on the stack master, only basic routing
(static routing and RIP) is supported. Whenever possible, to maintain high performance, forwarding is
done by the switch hardware. However, only IP version 4 packets with Ethernet II encapsulation can be
routed in hardware. Non-IP traffic and traffic with other encapsulation methods can be fallback-bridged
by hardware.
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Using Interface Configuration Mode
The switch supports these interface types:
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You can also configure a range of interfaces (see the
page
To configure a physical interface (port), enter interface configuration mode, and specify the interface type,
stack member number, module number, and switch port number.
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78-16180-02
The routing function can be enabled on all SVIs and routed ports. The switch routes only IP traffic.
When IP routing protocol parameters and address configuration are added to an SVI or routed port,
any IP traffic received from these ports is routed. For more information, see
"Configuring IP Unicast Routing," Chapter 36, "Configuring IP Multicast Routing,"
Chapter 37, "Configuring MSDP."
Fallback bridging forwards traffic that the switch does not route or traffic belonging to a nonroutable
protocol, such as DECnet. Fallback bridging connects multiple VLANs into one bridge domain by
bridging between two or more SVIs or routed ports. When configuring fallback bridging, you assign
SVIs or routed ports to bridge groups with each SVI or routed port assigned to only one bridge
group. All interfaces in the same group belong to the same bridge domain. For more information,
see
Chapter 38, "Configuring Fallback Bridging."
Physical ports—including switch ports and routed ports
VLANs—switch virtual interfaces
Port-channels—EtherChannel of interfaces
11-9).
Type—Fast Ethernet (fastethernet or fa) for 10/100 Mbps Ethernet or Gigabit Ethernet
(gigabitethernet or gi) for 10/100/1000 Mbps Ethernet ports, or 10-Gigabit Ethernet
(tengigabitethernet or te) for 10,000 Mbps, or small form-factor pluggable (SFP) Gigabit Ethernet
interfaces.
Stack member number—The number that identifies the switch within the stack. The switch number
range is 1 to 9 and is assigned the first time the switch initializes. The default switch number, before
it is integrated into a switch stack, is 1. When a switch has been assigned a stack member number,
it keeps that number until another is assigned to it.
You can use the switch port LEDs in Stack mode to identify the stack member number of a switch.
For information about stack member numbers, see the
page
5-6.
Module number—The module or slot number on the switch (always 0 on the Catalyst 3750 switch).
Port number—The interface number on the switch. The port numbers always begin at 1, starting at
the left when facing the front of the switch, for example, fastethernet 1/0/1, fastethernet 1/0/2. If
there is more than one interface type (for example, 10/100 ports and Gigabit Ethernet ports), the port
numbers start again from 1with the second interface type: gigabitethernet1/0/1, gigabitethernet
1/0/2.
Using Interface Configuration Mode
"Configuring a Range of Interfaces" section on
"Stack Member Numbers" section on
Catalyst 3750 Switch Software Configuration Guide
Chapter 34,
and
11-7
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