Secondary Addresses

Answered Question
May 4th, 2006
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Looking to know if a secondary address will automatically become the primary if a primary address also configured on a FastEthernet LAN port is removed, or will it be removed as well?


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interface FastEthernet0/0

ip address 10.24.216.1 255.255.248.0 secondary

no ip address 10.40.80.1 255.255.248.0


Correct Answer by Harold Ritter about 11 years 3 months ago

The primary can't be removed unless all the secondaries are removed first. If you try to remove the primary, you will get the following message:


R1(config-if)#no ip address 192.168.1.1 255.255.255.0

Must delete secondary before deleting primary

R1(config-if)#



Hope this helps,

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Correct Answer
Harold Ritter Thu, 05/04/2006 - 03:30
User Badges:
  • Cisco Employee,

The primary can't be removed unless all the secondaries are removed first. If you try to remove the primary, you will get the following message:


R1(config-if)#no ip address 192.168.1.1 255.255.255.0

Must delete secondary before deleting primary

R1(config-if)#



Hope this helps,

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