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Disable layer3

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  • 1.  Disable layer3

    Posted Feb 08, 2018 05:11 AM

    What does this command do on a VLAN? disable layer3 vlan-id-range

     

    An ip address on the VLAN will be in shutdown state?

     

    What about ip-helper statements and ip igmp?

     

     



  • 2.  RE: Disable layer3

    EMPLOYEE
    Posted Feb 08, 2018 05:22 AM

    Screenshot, please.



  • 3.  RE: Disable layer3

    Posted Feb 08, 2018 05:24 AM

    SWITCH# conf t
    SWITCH(config)# disable
     layer3                Enable/disable layer 3 functionality.
    SWITCH(config)# disable layer3
     vlan                  Enable/disable layer 3 on a VLAN.
    SWITCH(config)# disable layer3 vlan
     VLAN-ID-RANGE         Enter the range of VLAN IDs on which to enable or
                           disable layer 3
    SWITCH(config)# disable layer3 vlan
     VLAN-ID-RANGE         Enter the range of VLAN IDs on which to enable or
                           disable layer 3
    SWITCH(config)# disable layer3 vlan 9
     <cr>
    SWITCH(config)# exit
    SWITCH#



  • 4.  RE: Disable layer3

    Posted Feb 08, 2018 08:06 AM 
    disable layer3 vlan

    This command disables Vlan's IP address. With this, this Vlan will not do the routing.

     

    ip igmp

    Enables the IGMP protocol in vlan (Multicast)

     

    ip helper

    DHCP relay



  • 5.  RE: Disable layer3

    EMPLOYEE
    Posted Feb 08, 2018 06:29 PM

    Hi, according to the manual ...

     

    When the disable layer3 command is configured on a VLAN, the behavior is as if no IP address were configured for that VLAN. There is no other change in behavior.

    In config context, turns off Layer 3 routing for the specified VLAN or VLANs. When executed in vlan context, turns off Layer 3 routing for that VLAN.

     

    Disabling L3 on a VLAN doesn't allow to configure any L3 services like DHCP, routing, ip-helper, etc. But if you already has configured the L3 over the VLAN the switch will send you a message that you are not allowed to disable it.