Advanced Configuration and Modification of the Management Ethernet Interface

This module describes the configuration of Management Ethernet interfaces.

Before you use Telnet to access the router through the LAN IP address, you must set up a Management Ethernet interface and enable the Telnet servers.


Note
By default, the Management Ethernet interfaces are present on the system. However, you must configure these interfaces to:

  • Access the router.

  • Use protocols and applications, such as Simple Network Management Protocol (SNMP), HTTP, eXtensible Markup Language (XML), TFTP, Telnet, and Command-Line Interface (CLI.)

Prerequisites for Configuring Management Ethernet Interfaces

Before you perform the Management Ethernet interface configuration procedures that are described in this chapter, ensure that you meet the following tasks and conditions:

  • You have performed the initial configuration of the Management Ethernet interface.

  • You know how to apply the generalized interface name specification rack/slot/module/port.


Note

For transparent switchover, ensure that both the active and standby Management Ethernet interfaces are physically connected to the same LAN or switch.

Information About Configuring Management Ethernet Interfaces

To configure Management Ethernet interfaces, you must understand the following concept(s):

Default Interface Settings

This table describes the default Management Ethernet interface settings that you can change with manual configuration. The system does not display the default settings in the show running-config command output.

Table 1. Management Ethernet Interface Default Settings

Parameter

Default Value

Configuration File Entry

Speed in Mbps

Default speed is 1G with autonegotiated.

Speed in non-configurable.

Duplex mode

Default duplex mode is full-duplex with autonegotiated.

Duplex mode is non-configurable.

MAC address

MAC address is read from the hardware burned-in address (BIA).

 MAC address is non-configurable.

How to Perform Advanced Management Ethernet Interface Configuration

This section contains the following procedures:

Configure a Management Ethernet Interface

Perform this task to configure a Management Ethernet interface. This procedure provides the minimal configuration that is required for the Management Ethernet interface.

Note
The maximum MTU value for the management interface MgmtEth0/RP0/CPU0/0 is 9678 bytes. 
RP/0/RP0/CPU0:router # configure

/* Enter interface configuration mode and specify the Ethernet interface name and notation rack/slot/module/port. */
RP/0/RP0/CPU0:router(config)# interface MgmtEth 0/RP0/CPU0/0

RP/0/RP0/CPU0:router(config-if)# ipv4 address 1.76.18.150/16 (or) 
ipv4 address 1.76.18.150 255.255.0.0

Assigns an IP address and subnet mask to the interface.

  • Replace ip-address with the primary IPv4 address for the interface.

  • Replace mask with the mask for the associated IP subnet. You can specify the network mask in either of the two ways:

  • The network mask can be a four-part dotted decimal address. For example, 255.255.0.0 indicates that each bit equal to 1 means that the corresponding address bit belongs to the network address.

  • The system indicates the network mask as a slash (/) and number. For example, /16 indicates that the first 16 bits of the mask are ones, and the corresponding bits of the address are the network address. 


RP/0/RP0/CPU0:router(config-if)# mtu 1488

Note

(Optional) The maximum transmission unit (MTU) value for the management interface is 9678 bytes.

  • The default is 1514 bytes.

  • The range for the Management Ethernet interface Interface mtu values is from 64 through 9678 bytes. 

/* Remove the shutdown configuration, which removes the forced administrative down on the interface, enabling it to move to an up or down state.  */
RP/0/RP0/CPU0:router(config-if)# no shutdown
RP/0/RP0/CPU0:router(config-if)# end
or
RP/0/RP0/CPU0:router(config-if)# commit

Saves configuration changes.

  • When you issue the end command, the system prompts you to commit changes: 

    
Uncommitted changes found, commit them before exiting(yes/no/cancel)?
[cancel]:

  • Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode.

  • Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.

  • Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes.

  • Use the commit command to save the configuration changes to the running configuration file and remain within the configuration session. 


RP/0/RP0/CPU0:router# show interfaces MgmtEth 0/RP0/CPU0/0

This example displays advanced configuration and verification of the Management Ethernet interface on the RP: 


RP/0/RP0/CPU0:router# configure 
RP/0/RP0/CPU0:router(config)# interface MgmtEth 0/RP0/CPU0/0 
RP/0/RP0/CPU0:router(config)# ipv4 address  1.76.18.150/16
RP/0/RP0/CPU0:router(config-if)# no shutdown
RP/0/RP0/CPU0:router(config-if)# commit 
RP/0/RP0/CPU0:router:Mar 26 01:09:28.685 :ifmgr[190]:%LINK-3-UPDOWN :Interface MgmtEth0/RP0/CPU0/0, changed state to Up
RP/0/RP0/CPU0:router(config-if)# end 

RP/0/RP0/CPU0:router# show interfaces MgmtEth 0/RP0/CPU0/0 

MgmtEth0/RP0/CPU0/0 is up, line protocol is up
  Interface state transitions: 3
  Hardware is Management Ethernet, address is 1005.cad8.4354 (bia 1005.cad8.4354)
  Internet address is 1.76.18.150/16
  MTU 1488 bytes, BW 1000000 Kbit (Max: 1000000 Kbit)
     reliability 255/255, txload 0/255, rxload 0/255
  Encapsulation ARPA,
  Full-duplex, 1000Mb/s, 1000BASE-T, link type is autonegotiation
  loopback not set,
  Last link flapped 00:00:59
  ARP type ARPA, ARP timeout 04:00:00
  Last input 00:00:00, output 00:00:02
  Last clearing of "show interface" counters never
  5 minute input rate 4000 bits/sec, 3 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     21826 packets input, 4987886 bytes, 0 total input drops
     0 drops for unrecognized upper-level protocol
     Received 12450 broadcast packets, 8800 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     1192 packets output, 217483 bytes, 0 total output drops
     Output 0 broadcast packets, 0 multicast packets
     0 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out
     3 carrier transitions

RP/0/RP0/CPU0:router# show running-config interface MgmtEth 0/RP0/CPU0/0 

interface MgmtEth0/RP0/CPU0/0
 mtu 1488
 ipv4 address 1.76.18.150/16
 ipv6 address 2002::14c:125a/64
 ipv6 enable
!
The following example displays VRF configuration and verification of the Management Ethernet interface on the RP with the source address:

RP/0/RP0/CPU0:router# show run interface MgmtEth 0/RP0/CPU0/0 
interface MgmtEth0/RP0/CPU0/0
 vrf httpupload
 ipv4 address 10.8.67.20 255.255.0.0
 ipv6 address 2001:10:8:67::20/48
!
 
RP/0/RP0/CPU0:router# show run http  
Wed Jan 30 14:58:53.458 UTC
http client vrf httpupload
http client source-interface ipv4 MgmtEth0/RP0/CPU0/0
 
RP/0/RP0/CPU0:router# show run vrf   
Wed Jan 30 14:59:00.014 UTC
vrf httpupload
!

Verify Management Ethernet Interface Configuration

Perform this task to verify configuration modifications on the Management Ethernet interfaces.

RP/0/RP0/CPU0:router# show interfaces MgmtEth 0/RP0/CPU0/0
RP/0/RP0/CPU0:router# show running-config interface MgmtEth 0/RP0/CPU0/0

Configuration Examples for Management Ethernet Interfaces

This section provides the following configuration examples:

Configuring a Management Ethernet Interface: Example

This example displays advanced configuration and verification of the Management Ethernet interface on the RP: 


RP/0//CPU0:router# configure 
RP/0//CPU0:router(config)# interface MgmtEth 0/RP0/CPU0/0 
RP/0//CPU0:router(config)# ipv4 address  172.29.52.70 255.255.255.0
RP/0//CPU0:router(config-if)# no shutdown
RP/0//CPU0:router(config-if)# commit 
RP/0//CPU0:Mar 26 01:09:28.685 :ifmgr[190]:%LINK-3-UPDOWN :Interface MgmtEth 0/RP0/CPU0/0, changed state to Up
RP/0//CPU0:router(config-if)# end 

RP/0//CPU0:router# show interfaces MgmtEth 0/RP0/CPU0/0 

MMgmtEth0//CPU0/0 is up, line protocol is up
  Hardware is Management Ethernet, address is 0011.93ef.e8ea (bia 0011.93ef.e8ea
)
  Description: Connected to Lab LAN
  Internet address is 172.29.52.70/24
  MTU 1514 bytes, BW 100000 Kbit
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA,  loopback not set,
  ARP type ARPA, ARP timeout 04:00:00
  Last clearing of "show interface" counters never
  5 minute input rate 3000 bits/sec, 7 packets/sec
  5 minute output rate 0 bits/sec, 1 packets/sec
     30445 packets input, 1839328 bytes, 64 total input drops
     0 drops for unrecognized upper-level protocol
     Received 23564 broadcast packets, 0 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     171672 packets output, 8029024 bytes, 0 total output drops
     Output 16 broadcast packets, 0 multicast packets
     0 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out
     1 carrier transitions

RP/0//CPU0:router# show running-config interface MgmtEth 0/ 

interface MgmtEth0/RP0/CPU0/0
 description Connected to Lab LAN
 ipv4 address 172.29.52.70 255.255.255.0
!