Chapter 4, Configuring Interfaces

Table Of Contents

Configuring Interfaces

General Interface Guidelines

MAC Addresses

Interface Port ID

Basic Interface Configuration

Basic Fast Ethernet, Gigabit Ethernet, and POS Interface Configuration

Configuring the Fast Ethernet Interfaces (ML100T-12)

Configuring the Gigabit Ethernet Interface (ML1000-2)

Configuring the POS Interfaces (ML100T-12 and ML1000-2)

Monitoring Operations on the Fast Ethernet and Gigabit Ethernet Interfaces

Configuring Interfaces

This chapter describes basic interface configuration for the ML-Series card to help you get your ML-Series card up and running. Advanced POS interface configuration is covered in Chapter 5, "Configuring POS." For more information about the Cisco IOS commands used in this chapter, refer to the Cisco IOS Command Reference publication.

This chapter contains the following major sections:

• General Interface Guidelines

• Basic Interface Configuration

• Basic Fast Ethernet, Gigabit Ethernet, and POS Interface Configuration

• Monitoring Operations on the Fast Ethernet and Gigabit Ethernet Interfaces

Note Complete the initial configuration of your ML-Series card before proceeding with configuring interfaces.

General Interface Guidelines

The main function of the ML-Series card is to relay packets from one data link to another. Consequently, you must configure the characteristics of the interfaces, which receive and send packets. Interface characteristics include, but are not limited to, IP address, address of the port, data encapsulation method, and media type.

Many features are enabled on a per-interface basis. Interface configuration mode contains commands that modify the interface operation (for example, of an Ethernet port). When you enter the interface command, you must specify the interface type and number.

The following general guidelines apply to all physical and virtual interface configuration processes:

•All interfaces have a name that is composed of an interface type (word) and a Port ID (number). For example, FastEthernet 2.

•Configure each interface with a bridge-group or IP address and IP subnet mask.

•VLANs are supported through the use of subinterfaces. The subinterface is a logical interface configured separately from the associated physical interface.

•Each physical interface, including the internal packet-over-SONET/SDH (POS) interfaces, has an assigned MAC address.

MAC Addresses

Every port or device that connects to an Ethernet network needs a MAC address. Other devices in the network use MAC addresses to locate specific ports in the network and to create and update routing tables and data structures.

To find MAC addresses for a device, use the show interfaces command, as follows:

Router# sh interfaces fastEthernet 0
FastEthernet0 is up, line protocol is up
Hardware is epif_port, address is 0005.9a39.6634 (bia 0005.9a39.6634)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, Auto Speed, 100BaseTX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:18, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
11 packets input, 704 bytes
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 11 multicast
0 input packets with dribble condition detected
3 packets output, 1056 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Interface Port ID

The interface port ID designates the physical location of the interface within the ML-Series card. It is the name that you use to identify the interface you are configuring. The system software uses interface port IDs to control activity within the ML-Series card and to display status information. Interface port IDs are not used by other devices in the network; they are specific to the individual ML-Series card and its internal components and software.

The ML100T-12 port IDs for the 12 Fast Ethernet interfaces are Fast Ethernet 0 through 11. The ML1000-2 port IDs for the two Gigabit Ethernet interfaces are Gigabit Ethernet 0 and 1. Both ML-Series cards feature two POS ports, and the ML-Series port IDs for the two POS interfaces are POS 0 and 1. You can use user-defined abbreviations such as f0 through f11 to configure the 12 Fast Ethernet interfaces, gi0 or gi1 to configure the two Gigabit Ethernet interfaces, and POS0 and POS1 to configure the two POS ports.

You can use Cisco IOS show commands to display information about any or all the interfaces of the ML-Series card.

Caution Do not use the g0 or g1 for a Gigabit Ethernet user-defined abbreviation. This creates an unsupported group asynchronous interface.

Basic Interface Configuration

The following general configuration instructions apply to all interfaces. Before you configure interfaces, develop a plan for a bridge or routed network.

To configure an interface, do the following:

Step 1 Enter the configure EXEC command at the privileged EXEC prompt to enter global configuration mode.

Router> enable
Password:
Router# configure terminal
Router(config)#

Step 2 Enter the interface command, followed by the interface type (for example, fastethernet, gigabitethernet, or pos), and its interface port ID (see the "Interface Port ID" section).

For example, to configure a Gigabit Ethernet port, enter this command:

Router(config)# interface gigabitethernet number

Step 3 Follow each interface command with the interface configuration commands required for your particular interface.

The commands you enter define the protocols and applications that will run on the interface. The
ML-Series card collects and applies commands to the interface command until you enter another interface command or a command that is not an interface configuration command. You can also enter end to return to privileged EXEC mode.

Step 4 Check the status of the configured interface by entering the EXEC show interface command.

Router# sh interface fastEthernet 0
FastEthernet0 is up, line protocol is up
Hardware is epif_port, address is 0005.9a39.6634 (bia 0005.9a39.6634)
MTU 1500 bytes, BW 100000 Bit, DLY 100 use,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, Auto Speed, 100BaseTX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:18, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
11 packets input, 704 bytes
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 11 multicast
0 input packets with dribble condition detected
3 packets output, 1056 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

Basic Fast Ethernet, Gigabit Ethernet, and POS Interface Configuration

ML-Series cards support Fast Ethernet, Gigabit Ethernet, and POS interfaces. This section provides some examples of configurations for all interface types.

To configure an IP address or bridge-group number on a Fast Ethernet, Gigabit Ethernet, or POS interface, perform the following procedure, beginning in global configuration mode:

Command

Purpose

Step 1

Router(config)# interface type number

Activates interface configuration mode to configure either the Gigabit Ethernet interface, the Fast Ethernet interface, or the POS interface.

Step 2

Router(config-if)# {ip address ip-address subnet-mask | bridge-group bridge-group-number}

Sets the IP address and IP subnet mask to be assigned to the interface.

or

Assigns a network interface to a bridge group.

Step 3

Router(config-if)# no shutdown

Enables the interface by preventing it from shutting down.

Step 4

Router(config)# end

Returns to privileged EXEC mode.

Step 5

Router# copy running-config startup-config

(Optional) Saves configuration changes to timing and control card (TCC2/TCC2P) flash database.

Configuring the Fast Ethernet Interfaces (ML100T-12)

To configure the IP address or bridge-group number, autonegotiation, and flow control on a Fast Ethernet interface, perform the following procedure, beginning in global configuration mode:

Command

Purpose

Step 1

Router(config)# interface fastethernet number

Activates interface configuration mode to configure the Fast Ethernet interface.

Step 2

Router(config-if)# {ip address ip-address subnet-mask | bridge-group bridge-group-number}

Sets the IP address and IP subnet mask to be assigned to the interface.

or

Assigns a network interface to a bridge group.

Step 3

Router(config-if)# [no] speed {10 | 100 | auto}

Configures the transmission speed for 10 or 100 Mbps. If you set the speed or duplex for auto, you enable autonegotiation on the system—the ML-Series card matches the speed and duplex mode of the partner node.

Step 4

Router(config-if)# [no] duplex {full | half | auto}

Sets full duplex, half duplex, or autonegotiate mode.

Step 5

Router(config-if)# flowcontrol send {on | off | desired}

(Optional) Sets the send flow control value for an interface. Flow control works only with port-level policing. ML-Series card Fast Ethernet port flow control is IEEE 802.3x compliant.

Step 6

Router(config-if)# no shutdown

Enables the interface by preventing it from shutting down.

Step 7

Router(config)# end

Returns to privileged EXEC mode.

Step 8

Router# copy running-config startup-config

(Optional) Saves your configuration changes to TCC2/TCC2P flash database.

Example 4-1 shows how to do the initial configuration of a Fast Ethernet interface with an IP address, autonegotiated speed, and autonegotiated duplex.

Example 4-1 Initial Configuration of a Fast Ethernet Interface

Router(config)# interface fastethernet 1
Router(config-if)# ip address 10.1.2.4 255.0.0.0
Router(config-if)# speed auto
Router(config-if)# duplex auto
Router(config-if)# no shutdown
Router(config-if)# end
Router# copy running-config startup-config

Configuring the Gigabit Ethernet Interface (ML1000-2)

To configure IP address or bridge-group number, autonegotiation, and flow control on a Gigabit Ethernet interface, perform the following procedure, beginning in global configuration mode:

Note The default setting for the negotiation mode is auto for the Gigabit Ethernet and Fast Ethernet interfaces. The Gigabit Ethernet port always operates at 1000 Mbps in full-duplex mode.

Command

Purpose

Step 1

Router# interface gigabitethernet number

Activates interface configuration mode to configure the Gigabit Ethernet interface.

Step 2

Router(config-if)# {ip address ip-address subnet-mask | bridge-group bridge-group-number}

Sets the IP address and subnet mask.

or

Assigns a network interface to a bridge group.

Step 3

Router(config-if)# [no] negotiation auto

Sets negotiation mode to auto. The Gigabit Ethernet port attempts to negotiate the link with the partner port.

If you want the port to force the link up no matter what the partner port setting is, set the Gigabit Ethernet interface to no negotiation auto.

Step 4

Router(config-if)# flowcontrol {send | receive} {on | off | desired}

(Optional) Sets the send or receive flow control value for an interface. Flow control works only with port-level policing. ML-Series card Gigabit Ethernet port flow control is IEEE 802.3z compliant.

Step 5

Router(config-if)# no shutdown

Enables the interface by preventing it from shutting down.

Step 6

Router(config)# end

Returns to privileged EXEC mode.

Step 7

Router# copy running-config startup-config

(Optional) Saves configuration changes to TCC2/TCC2P flash database.

Example 4-2 shows how to do an initial configuration of a Gigabit Ethernet interface with autonegotiation and an IP address.

Example 4-2 Initial Configuration of a Gigabit Ethernet Interface

Router(config)# interface gigabitethernet 0
Router(config-if)# ip address 10.1.2.3 255.0.0.0
Router(config-if)# negotiation auto
Router(config-if)# no shutdown
Router(config-if)# end
Router# copy running-config startup-config

Configuring the POS Interfaces (ML100T-12 and ML1000-2)

Encapsulation changes on POS ports are allowed only when the interface is in a manual shutdown (ADMIN_DOWN). For advanced POS interface configuration, see Chapter 5, "Configuring POS."

To configure the IP address, bridge group, or encapsulation for the POS interface, perform the following procedure, beginning in global configuration mode:

Command

Purpose

Step 1

Router(config)# interface pos number

Activates interface configuration mode to configure the POS interface.

Step 2

Router(config-if)# {ip address ip-address subnet-mask | bridge-group bridge-group-number}

Sets the IP address and subnet mask.

or

Assigns a network interface to a bridge group.

Step 3

Router(config-if)# shutdown

Manually shuts down the interface. Encapsulation changes on POS ports are allowed only when the interface is shut down (ADMIN_DOWN).

Step 4

Router(config-if)# encapsulation type

Sets the encapsulation type. Valid values are:

•hdlc—Cisco HDLC

•lex—(Default) LAN extension, special encapsulation for use with Cisco ONS Ethernet line cards

•ppp—Point-to-Point Protocol

Step 5

Router(config-if)# no shutdown

Restarts the shutdown interface.

Step 6

Router(config)# end

Returns to privileged EXEC mode.

Step 7

Router# copy running-config startup-config

(Optional) Saves configuration changes to NVRAM.

Monitoring Operations on the Fast Ethernet and Gigabit Ethernet Interfaces

To verify the settings after you have configured the interfaces, enter the show interface command. For additional information on monitoring the operations on POS interfaces, see the "Configuring POS" chapter.

Example 4-3 shows the output from the show interface command, which displays the status of the interface including port speed and duplex operation.

Example 4-3 show interface Command Output

Router# show interface fastEthernet 0
FastEthernet1 is administratively down, line protocol is down
Hardware is epif_port, address is 000d.bd5c.4c85 (bia 000d.bd5c.4c85)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto Speed, 100BaseTX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes
Received 0 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

Enter the show controller command to display information about the Fast Ethernet controller chip.

Example 4-4 shows the output from the show controller command, which shows statistics, including information about initialization block information.

Example 4-4 show controller Command Output

Router# show controller fastEthernet 0
IF Name: FastEthernet0
Port Status DOWN
Send Flow Control : Disabled
Receive Flow Control : Enabled
MAC registers
CMCR : 0x0000042D (Tx Enabled, Rx Disabled)
CMPR : 0x150B0A80 (Long Frame Disabled)
FCR : 0x0000A00B (Rx Pause detection Enabled)
MII registers:
Control Register (0x0): 0x4000 (Auto negotiation disabled)
Status Register (0x1): 0x7809 (Link status Down)
PHY Identification Register 1 (0x2): 0x40
PHY Identification Register 2 (0x3): 0x61D4
Auto Neg. Advertisement Reg (0x4): 0x1E1 (Speed 100, Duplex Full)
Auto Neg. Partner Ability Reg (0x5): 0x0 (Speed 10, Duplex Half)
Auto Neg. Expansion Register (0x6): 0x4
100Base-X Aux Control Reg (0x10): 0x2000
100Base-X Aux Status Register(0x11): 0x0
100Base-X Rcv Error Counter (0x12): 0x0
100Base-X False Carr. Counter(0x13): 0x0

Enter the show run interface [type number] command to display information about the configuration of the Fast Ethernet interface. The command is useful when there are multiple interfaces and you want to look at the configuration of a specific interface.

Example 4-5 shows output from the show run interface [type number] command, which includes information about the IP or lack of IP address and the state of the interface.

Example 4-5 show run interface Command Output

daytona# show run interface FastEthernet 1
Building configuration...

Current configuration : 56 bytes
!
interface FastEthernet1
no ip address
shutdown

end

	Command	Purpose
Step 1	`Router(config)# interface type number`	Activates interface configuration mode to configure either the Gigabit Ethernet interface, the Fast Ethernet interface, or the POS interface.
Step 2	`Router(config-if)# {ip address ip-address subnet-mask \| bridge-group bridge-group-number}`	Sets the IP address and IP subnet mask to be assigned to the interface. or Assigns a network interface to a bridge group.
Step 3	`Router(config-if)# no shutdown`	Enables the interface by preventing it from shutting down.
Step 4	`Router(config)# end`	Returns to privileged EXEC mode.
Step 5	`Router# copy running-config startup-config`	(Optional) Saves configuration changes to timing and control card (TCC2/TCC2P) flash database.

	Command	Purpose
Step 1	`Router(config)# interface fastethernet number`	Activates interface configuration mode to configure the Fast Ethernet interface.
Step 2	`Router(config-if)# {ip address ip-address subnet-mask \| bridge-group bridge-group-number}`	Sets the IP address and IP subnet mask to be assigned to the interface. or Assigns a network interface to a bridge group.
Step 3	`Router(config-if)# [no] speed {10 \| 100 \| auto}`	Configures the transmission speed for 10 or 100 Mbps. If you set the speed or duplex for auto, you enable autonegotiation on the system—the ML-Series card matches the speed and duplex mode of the partner node.
Step 4	`Router(config-if)# [no] duplex {full \| half \| auto}`	Sets full duplex, half duplex, or autonegotiate mode.
Step 5	`Router(config-if)# flowcontrol send {on \| off \| desired}`	(Optional) Sets the send flow control value for an interface. Flow control works only with port-level policing. ML-Series card Fast Ethernet port flow control is IEEE 802.3x compliant.
Step 6	`Router(config-if)# no shutdown`	Enables the interface by preventing it from shutting down.
Step 7	`Router(config)# end`	Returns to privileged EXEC mode.
Step 8	`Router# copy running-config startup-config`	(Optional) Saves your configuration changes to TCC2/TCC2P flash database.

	Command	Purpose
Step 1	`Router# interface gigabitethernet number`	Activates interface configuration mode to configure the Gigabit Ethernet interface.
Step 2	`Router(config-if)# {ip address ip-address subnet-mask \| bridge-group bridge-group-number}`	Sets the IP address and subnet mask. or Assigns a network interface to a bridge group.
Step 3	`Router(config-if)# [no] negotiation auto`	Sets negotiation mode to auto. The Gigabit Ethernet port attempts to negotiate the link with the partner port. If you want the port to force the link up no matter what the partner port setting is, set the Gigabit Ethernet interface to no negotiation auto.
Step 4	`Router(config-if)# flowcontrol {send \| receive} {on \| off \| desired}`	(Optional) Sets the send or receive flow control value for an interface. Flow control works only with port-level policing. ML-Series card Gigabit Ethernet port flow control is IEEE 802.3z compliant.
Step 5	`Router(config-if)# no shutdown`	Enables the interface by preventing it from shutting down.
Step 6	`Router(config)# end`	Returns to privileged EXEC mode.
Step 7	`Router# copy running-config startup-config`	(Optional) Saves configuration changes to TCC2/TCC2P flash database.

	Command	Purpose
Step 1	`Router(config)# interface pos number`	Activates interface configuration mode to configure the POS interface.
Step 2	`Router(config-if)# {ip address ip-address subnet-mask \| bridge-group bridge-group-number}`	Sets the IP address and subnet mask. or Assigns a network interface to a bridge group.
Step 3	`Router(config-if)# shutdown`	Manually shuts down the interface. Encapsulation changes on POS ports are allowed only when the interface is shut down (ADMIN_DOWN).
Step 4	`Router(config-if)# encapsulation type`	Sets the encapsulation type. Valid values are: •hdlc—Cisco HDLC •lex—(Default) LAN extension, special encapsulation for use with Cisco ONS Ethernet line cards •ppp—Point-to-Point Protocol
Step 5	`Router(config-if)# no shutdown`	Restarts the shutdown interface.
Step 6	`Router(config)# end`	Returns to privileged EXEC mode.
Step 7	`Router# copy running-config startup-config`	(Optional) Saves configuration changes to NVRAM.