Subinterfaces

datchchadatchcha Member Posts: 265
in CCNA & CCENT
Question about subinterfaces.

when configuring subinterfaces, the following commands are used.

int fa0/0
no ip address
no shut

int fa0/0.1
ip address 172.16.10.1 255.255.255.0

int fa0/0.2
ip address 172.16.20.1 255.255.255.0

Is there a way to shutdown (1) subinterface with out shutting down the entire Fa0/0 port? For example: i want to shut down fa0/0.2, but keep fa0/0.1 up.

Thank you,
Arrakis
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Comments

  • mikearamamikearama Member Posts: 749
    and

    <config>#int fa0/0.2
    <config-int>#shut

    didn't work?
    There are only 10 kinds of people... those who understand binary, and those that don't.

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  • datchchadatchcha Member Posts: 265
    don't know, not at my lab right now...working on a Navision sql backup and passing my time.
    Arrakis
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  • MikdillyMikdilly Member Posts: 309
    How do you remove multipoint from a sub-interface?

    R2#show run
    Building configuration...

    Current configuration : 1028 bytes
    !
    version 12.2
    service timestamps debug uptime
    service timestamps log uptime
    no service password-encryption
    !
    hostname R2
    !
    !
    !
    interface Serial1/0
    no ip address
    encapsulation frame-relay
    serial restart-delay 0
    frame-relay lmi-type ansi
    !
    interface Serial1/0.1 multipoint
    !
    interface Serial1/1
    no ip address
    shutdown
    serial restart-delay 0
    !
    interface Serial1/2
    no ip address
    shutdown
    serial restart-delay 0
    !
    interface Serial1/3
    no ip address
    shutdown
    serial restart-delay 0
    !
    router ospf 65
    log-adjacency-changes
    network 140.1.0.0 0.0.255.255 area 0
    --More--


    Tried changing to: int s1/0.1 point-to-point
    and get: % Warning: cannot change link type
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  • mikej412mikej412 Member Posts: 10,086 ■■■■■■■■■■
    I don't think you can change it without a reload.

    Use the "no" version of the command to get rid if the current sub-interface -- then reload. Then configure the point-to-point version of that sub-interface.
    :mike: Cisco Certifications -- Collect the Entire Set!
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  • keenonkeenon Member Posts: 1,922 ■■■■□□□□□□
    datchcha wrote:
    Question about subinterfaces.

    when configuring subinterfaces, the following commands are used.

    int fa0/0
    no ip address
    no shut

    int fa0/0.1
    ip address 172.16.10.1 255.255.255.0

    int fa0/0.2
    ip address 172.16.20.1 255.255.255.0

    Is there a way to shutdown (1) subinterface with out shutting down the entire Fa0/0 port? For example: i want to shut down fa0/0.2, but keep fa0/0.1 up.

    Thank you,

    per this posting..

    you will need to choose an encapsulation under the subinterfaces and its very good to set the speed and duplex on both sides of the trunk link.

    per your other question about shutting down a certain subinterface without taking down another .. yes you can
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