Table Of Contents
Gigabit Ethernet Port Adapter
Feature OverviewFeature Overview
Benefits
Related Documents
Supported Platforms
Supported Standards, MIBs, and RFCs
Configuration Tasks
Configuring the Gigabit Ethernet Interface
Verifying Interface Status
Configuration Examples
Configuring the Gigabit Ethernet Interface
Automatic Network Connection
Setting the Maximum Transmission Unit (MTU)
Command Reference
mtu
negotiation auto
show interface gigabitethernet
Gigabit Ethernet Port Adapter
This feature module describes the Gigabit Ethernet port adapter feature. It includes information on the benefits of the new feature, supported platforms, related documents, and so forth.
This document includes the following sections:
•
Feature OverviewFeature Overview
•Supported Platforms
•Supported Standards, MIBs, and RFCs
•Configuration Tasks
•Configuration Examples
•Command Reference
The Gigabit Ethernet Port Adapter (GEPA) is a single-port fixed port adapter that, when combined with the appropriate optical fiber cable, provides one 1000-Mbps Gigabit Ethernet interface that complies with IEEE 802.3z specifications. The Gigabit Ethernet interface operates in full-duplex mode at 1000 Mbps for transmit (TX) and receive (RX) directions.
The GEPA is available on all Cisco 7200 VXR series routers and the Cisco 7100 series routers.
The maximum Ethernet frame size is 1518 bytes but GEPA supports MTU size up to 4470 bytes in full-duplex mode for point-to-point links. The mtu interface command (maximum transmission unit) is supported to allow you to specify an MTU size up to 4470 bytes.
Benefits
The GEIP supports the following benefits:
•Applicable IEEE 802.3z standards; full-duplex operation only
•IEEE 802.3x flow control
•Supports Cisco HSRP protocol for router "hot standby"
•Supports IEEE 802.1Q VLAN standard
•Supports distributed switching for multicast and ISL packets
•Layer 3 distributed services, including RSP packet forwarding, distributed optimum switching, fast switching, distributed flow switching, and distributed committed access rate (DCAR)
•Maximum transmission unit (MTU) of 4,470 bytes
•Ethernet Inter-Switch Link (ISL) encapsulation
•Online insertion and removal of the GEIP and the Gigabit interface converter (GBIC)
Related Documents
•PA-GE Gigabit Ethernet Port Adapter Installation and Configuration, Cisco IOS Release 12.1
•For port adapter hardware and memory configuration guidelines for Cisco 7200 VXR routers (including the Cisco 7206VXR as a router shelf in a Cisco AS5800 Universal Access Server), refer to the document Cisco 7200 Series Port Adapter Hardware Configuration Guidelines.
•For port adapter hardware and memory configuration guidelines for Cisco 7100 routers, refer to the document Cisco 7100 Series Port Adapter Hardware Configuration Guidelines.
•For hardware installation and maintenance information, refer to the Cisco 7200 VXR Installation and Configuration Guide that shipped with your Cisco 7200 VXR router.
•For hardware installation and maintenance information, refer to the Cisco 7100 Installation and Configuration Guide that shipped with your Cisco 7100 router.
Supported Platforms
•Cisco 7200 VXR series
•Cisco 7100 series
Supported Standards, MIBs, and RFCs
Standards
•None
MIBs
•None
RFCs
•None
Configuration Tasks
See the following sections for configuration tasks for the Gigabit Ethernet interface feature. Each task in the list indicates if the task is optional or required.
•Configuring the Gigabit Ethernet Interface
Configuring the Gigabit Ethernet Interface
| |
Command
|
Purpose
|
Step 1
|
Router(config)# interface gagabitethernet slot/port
|
Enters the first interface to configure.
|
Step 2
|
Router(config-if)# ip address 1.1.1.10 255.255.255.252
|
Assigns an IP address and subnet mask to the interface if IP routing is enabled on the system.
|
Step 3
|
Add any additional configuration subcommands required to enable routing protocols and set the interface characteristics for your configuration.
|
|
Step 4
|
Router(config-if)# no shutdown
|
Changes the shutdown state to up and enables the interface.
|
Step 5
|
Router(config-if)# Ctrl-Z
|
When you have included all the configuration subcommands to complete the configuration, press Ctrl-Z to exit configuration mode.
|
Step 6
|
Router# copy running-config startup-config
|
Writes the new configuration to start up the configuration.
|
Note Full-duplex operation is the default for the GEPA. Half-duplex operation is not supported.
Verifying Interface Status
Enter the show interface gigabitethernet command to display the status of the new interface, or to verify changes you have made.
Router# show interfaces gigabitethernet 5/0
GigabitEthernet5/0 is up, line protocol is up
Hardware is (WISEMAN)Gigabit Ethernet, address is 00e0.14e4.6b8c (bia 00e0.14e4.6b8c)
Internet address is 10.1.1.10/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set
Full-duplex mode, link type is autonegotiation, media type is LX
output flow-control is on, input flow-control is on
ARP type:ARPA, ARP Timeout 04:00:00
Last input 00:00:02, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
18457 packets input, 1829178 bytes, 0 no buffer
Received 257 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 7949 frame, 0 overrun, 0 ignored
0 watchdog, 18084 multicast, 0 pause input
230005 packets output, 245673899 bytes, 0 underruns
0 babbles, 0 late collision, 674 deferred
123 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
Configuration Examples
This section provides the following Gigabit Ethernet interface configuration examples, including subcommands required to enable routing protocols and set the interface characteristics for your configuration requirements.
•Configuring the Gigabit Ethernet Interface
•Automatic Network Connection
•Setting the Maximum Transmission Unit (MTU)
Configuring the Gigabit Ethernet Interface
This example shows how to configure the Gigabit Ethernet interface. The following commands are configured on slot 5, port 0.
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface gigabitethernet 5/0
Router(config-if)# ip address 1.1.1.10 255.255.255.252
Automatic Network Connection
This example shows how to set up an automatic network connection between the Gigabit Ethernet interface and its remote partner. The following commands are configured on slot 5, port 0.
Router#configure terminal
Router#interface gigabitethernet 5/0
Use the show interface gigabitethernet command to view automatic negotiation statistics
Router#show interface gigabitethernet 5/0
GigabitEthernet5/0/0 is up, line protocol is up
Hardware is cyBus GigabitEthernet Interface, address is 0010.145a.00a0 (bia 0)
Internet address is 64.0.0.5/8
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Full-duplex mode, link type is autonegotiation, media type is SX
Setting the Maximum Transmission Unit (MTU)
This example shows how to set the maximum transmission unit (MTU) to 4470 bytes (size of the next packet sent). The following commands are configured on slot 5, port 0.
Router#configure terminal
Router(config)#interface gigabitethernet 5/0
Router(config-if)#mtu 1501
Use the show interface gigabitethernet command to view MTU statistics.
Router#show interface gigabitethernet 5/0
GigabitEthernet5/0/0 is up, line protocol is up
Hardware is cyBus GigabitEthernet Interface, address is 0010.145a.00a0 (bia 0)
Internet address is 64.0.0.5/8
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec
Command Reference
This section documents new commands. All other commands used with this feature are documented in the Cisco IOS Release 12.1 command reference publications.
•mtu
•negotiation auto
•show interface gigabitethernet
mtu
To adjust the maximum transmission unit (MTU) size, use the mtu interface configuration command. Use the no form of this command to restore the MTU value to its original default value of 1500.
mtu bytes
no mtu
Syntax Description
bytes
|
Specifies the size in bytes. The range is 1500 to 4470.
The byte size specified becomes the new maximum packet sent size and received by the interface. Configure both ends with the same MTU value. If they are different, the end configured with the smaller value will discard the larger packet.
|
Defaults
1500 (standard Ethernet maximum packet size).
Command Modes
Interface configuration
Command History
Release
|
Modification
|
10.0
|
This command was introduced.
|
12.0(4)E
|
The Cisco 7100 series platform was added.
|
Usage Guidelines
The mtu command will cause all interfaces on the router to be reset.
Examples
The following example shows how to configure the mtu command for the Gigabit Ethernet interface port slot 5:
Router# configure terminal
Router(config)# interface gigabit ethernet 5/0/0
Router(config-if)# mtu 1500
negotiation auto
To set the automatic negotiation mode, use the negotiation auto interface configuration command. To bypass the automatic negotiation process, use the no form of the command.
negotiation auto
no negotiation auto
Syntax Description
This command has no arguments or keywords.
|
Defaults
negotiation auto
Command Modes
Interface configuration
Command History
Release
|
Modification
|
11.1 CC
|
This command was introduced.
|
12.1(4)E
|
The Cisco 7100 series platform was added.
|
Usage Guidelines
The automatic negotiation mode is enabled by default. Some early Gigabit Ethernet products that predate the IEEE 802.3z standard might not support the automatic negotiation process or have problems establishing a connection. In these cases, the link is established by disabling the auto negotiation mode. GEPA allows the automatic negotiation process to be re-enabled by the negotiation auto command or bypassed by issuing the no negotiation auto command.
To disable auto negotiation, use the no negotiation auto command. This forces the interface to enter a state called force-link-up. Use the show interface command to display the current state.
Note Flow control is disabled in this state.
Examples
The following example shows how to enable negotiation of the Gigabit Ethernet interface port in
slot 5:
Router# configure terminal
Router(config)# interface gigabitethernet 5/0
Router(config-if)# negotiation auto
Related Commands
Command
|
Description
|
show interface gigabitethernet
|
Displays information about the Gigabit Ethernet interface.
|
show interface gigabitethernet
To display information about the Gigabit Ethernet interface, use the show interface gigabitethernet privileged EXEC command.
show interface gigabitethernet [slot/port-adapter/port] Cisco 7500 series and Cisco 7000 series
routers with RSP7000 and RSP7000CI
show interface gigabitethernet [slot/port] Cisco 7100 series and Cisco 7200 VXR series routers
Syntax Description
slot
|
Slot location of the port adapter.
|
port-adapter
|
On the Cisco 7500 series and Cisco 7000 series with RSP, specifies the ports on a VIP card. The value can be 0 or 1.
|
port
|
Port number on the port adapter.
|
Defaults
No default behavior or values.
Command Modes
Privileged EXEC
Command History
Release
|
Modification
|
11.1 CC
|
This command was introduced.
|
12.1(4)E
|
The Cisco 7100 series platform was added.
|
Examples
The following example shows the first Gigabit Ethernet interface port on a GEPA in interface processor slot 5:
Router# show interface gigabit 5/0
GigabitEthernet5/0 is up, line protocol is up
Hardware is cyBus GigabitEthernet, address is 0010.145a.00a0 (bia 0010.145a.0)
Internet address is 40.0.0.3/8
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive set (10 sec)
Full-duplex mode, link type is autonegotiation, media type is SX
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 01:29:50, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
592 packets input, 42084 bytes, 0 no buffer
Received 564 broadcasts, 0 runts, 0 giants
0 input errors, 0 CRC, 101796 frame, 0 overrun, 0 ignored
0 watchdog, 4 multicast, 0 pause input
39528 packets output, 4092713 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 263 deferred
57 lost carrier, 0 no carrier, 0 pause output
0 output buffers copied, 0 interrupts, 0 failures
Table 1
Field
|
Description
|
GigabitEthernet 5/0/0... is {up | down}...is administratively down
|
Indicates whether the interface hardware is currently active (whether carrier detect is present) or if it has been taken down by an administrator.
|
line protocol is {up | down}
|
Indicates whether the software processes that handle the line protocol consider the line usable (that is, whether keepalives are successful) or if it has been taken down by an administrator.
|
Address is
|
IP address.
|
Hardware is
|
Hardware type.
|
Internet address is
|
Internet address and subnet mask.
|
MTU
|
Maximum transmission unit of the interface.
|
BW
|
Value of the bandwidth parameter that has been configured for the interface (in kilobits per second). The bandwidth parameter is used to compute IGRP metrics only.
|
DLY
|
Delay of the interface in microseconds.
|
rely
|
Reliability of the interface as a fraction of 255 (255/255 is 100% reliability), calculated as an exponential average over 5 minutes.
|
load
|
Load on the interface as a fraction of 255 (255/255 is completely saturated), calculated as an exponential average over 5 minutes.
|
Encapsulation
|
Encapsulation method assigned to interface.
|
loopback
|
Indicates whether loopback is set or not.
|
keepalive set
|
Indicates whether keepalives are set or not.
|
Full-duplex mode
|
Indicates what mode is set.
|
link type
|
Indicates whether auto negotiation is set or not.
|
media type
|
Indicates what GBIC type is used.
|
output flow control
|
Indicates whether output flow control is supported or not.
|
input flow control
|
Indicates whether input flow control is supported or not.
|
ARP type
|
Existing feature.
|
ARP Timeout
|
Existing feature.
|
Last input
|
Number of hours, minutes, and seconds since the last packet was successfully received by an interface. Useful for knowing when a dead interface failed.
|
Last output
|
Number of hours, minutes, and seconds since the last packet was successfully transmitted by an interface.
|
output hang
|
Number of hours, minutes, and seconds (or never) since the interface was last reset because of a transmission that took too long. When the number of hours in any of the "last" fields exceeds 24 hours, the number of days and hours is printed. If that field overflows, asterisks are printed.
|
Last clearing of show interface counters
|
Time since the counters were cleared.
|
Queuing strategy
|
Existing feature.
|
Output queue, drops
|
Number of packets in output queue. Each number is followed by a slash, the maximum size of the queue, and the number of packets dropped due to a full queue.
|
Input queue, drops
|
Number of packets in input queue. Each number is followed by a slash, the maximum size of the queue, and the number of packets dropped due to a full queue.
|
30 second input rate
30 second output rate
|
Average number of bits and packets transmitted per second in the last 30 seconds.
The 30 second input and output rates should be used only as an approximation of traffic per second during a given 30-second period. These rates are exponentially weighted averages with a time constant of 30-seconds. A period of four time constants must pass before the average will be within two percent of the instantaneous rate of a uniform stream of traffic over that period.
|
packets input
|
Total number of error-free packets received by the interface.
|
bytes
|
Total number of bytes, including data and MAC encapsulation, in the error-free packets received by the system.
|
no buffer
|
Number of received packets discarded because there was no buffer space in the main system. Compare with ignored count. Broadcast storms on Ethernets and bursts of noise on serial lines are often responsible for no input buffer events.
|
Received... broadcasts
|
Total number of broadcast or multicast packets received by the interface.
|
runts
|
Number of packets that are discarded because they are smaller than the medium's minimum packet size.
|
giants
|
Number of packets that are discarded because they exceed the medium's MTU size.
|
input errors
|
Total number of no buffer, runts, giants, CRCs, frame, overrun, ignored, and abort counts. Other input-related errors can also increment the count, so that this sum might not balance with the other counts.
|
CRC
|
Cyclic redundancy checksum generated by the originating station or far-end device does not match the checksum calculated from the data received. On a serial link, CRCs usually indicate noise, gain hits, or other transmission problems on the data link.
|
frame
|
Number of packets not framed correctly.
|
overrun
|
Number of times the serial receiver hardware was unable to hand received data to a hardware buffer because the input rate exceeded the receiver's ability to handle the data.
|
ignored
|
Number of received packets ignored by the interface because the interface hardware ran low on internal buffers. Broadcast storms and bursts of noise can cause the ignored count to be increased.
|
watchdog
|
Existing feature.
|
multicast
|
Existing feature.
|
pause input
|
Number of PAUSE (XOFF) packets received.
|
packets output
|
Total number of messages transmitted by the interface.
|
bytes
|
Total number of bytes, including data and MAC encapsulation, transmitted by the system.
|
underruns
|
Number of times that the transmitter has been running faster than the router can handle. This should not occur on this interface.
|
output errors
|
Sum of all errors that prevented the final transmission of datagrams out of the interface being examined. Note that this might not balance with the sum of the enumerated output errors, because some datagrams can have more than one error, and others can have errors that do not fall into any of the specifically tabulated categories.
|
collisions
|
Not applicable.
|
interface resets
|
Number of times an interface has been completely reset. This can happen if packets queued for transmission were not sent within several seconds' time. On a serial line, this can be caused by a malfunctioning modem that is not supplying the transmit clock signal, or by a cable problem. If the system notices that the carrier detect line of a serial interface is up, but the line protocol is down, it periodically resets the interface in an effort to restart it. Interface resets can also occur when an interface is looped back or shut down.
|
babbles
|
Not applicable.
|
late collision
|
Not applicable.
|
deferred
|
Number of packets deferred during transmission when the network media is busy.
|
lost carrier
|
Number of times the interface detection link is lost.
|
no carrier
|
Indicates whether there is a carrier or not.
|
pause output
|
Indicates number of PAUSE packets transmitted.
|
output buffers copied
|
Number of packets copied to system memory.
|
interrupts
|
Should always be zero.
|
failures
|
Number of no resource errors received on the output.
|
Show Interface GigabitEthernet Field Descriptions
