Campus Switching and Routing

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Occasional Contributor II

Disable layer3

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?

 

 

Guru Elite

Re: Disable layer3

Screenshot, please.



Colin Joseph
Aruba Customer Engineering

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Occasional Contributor II

Re: Disable layer3

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#

Contributor II

Re: Disable layer3

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


|ATP FLEXNETWORK V3|ACSA
Contributor I

Re: Disable layer3

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.

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