SQL Server failover cluster, cluster IP already in use error under cluster roles and other resources.

Sue_8827 81 Reputation points
2021-09-05T02:29:28.44+00:00

Error: Cluster resource 'AGGROUP' of type 'IP address' in clustered role failed. The error code was '0x13c1' (the cluster IP address already in use)

Confirmed the IP address wasn't a duplicate or used by anything else. After some research I found that this is a virtual IP that is set the same as cluster IP. But I did not explicitly create a Virtual IP. Can I delete this?

Environment Details: Two node cluster in the same subnet. SQL 2017 Always on. OS windows 2019. System Manufacture VMware.
Node1 - 10.x.xx.01
Node2 - 10.x.xx.02
Cluster IP - 10.x.xx.03
Listener IP - 10.x.xx.04

SQL Server
SQL Server
A family of Microsoft relational database management and analysis systems for e-commerce, line-of-business, and data warehousing solutions.
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Windows Server Clustering
Windows Server Clustering
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Clustering: The grouping of multiple servers in a way that allows them to appear to be a single unit to client computers on a network. Clustering is a means of increasing network capacity, providing live backup in case one of the servers fails, and improving data security.
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  1. Seeya Xi-MSFT 16,456 Reputation points
    2021-09-06T02:31:47.003+00:00

    Hi @Sue_8827 ,

    The error code was '0x13c1' (the cluster IP address already in use).

    After some research I found that this is a virtual IP that is set the same as cluster IP. Can I delete this?

    Try not to do this. If you delete this IP address, the cluster will not find the corresponding IP address. It may be wrong in the case of static addresses. Of course, DHCP may also go wrong, it may find another duplicate address. Rather than delete operation that have a greater impact, I recommend modification operation.
    You can right-click the cluster name->Properties->give it an unoccupied static IP and bring it online.

    Best regards,
    Seeya


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  2. Sue_8827 81 Reputation points
    2021-09-06T07:15:19.167+00:00

    @Seeya Xi-MSFT

    1. How does this came about? I checked all other clusters I created none of them have this.
    2. Is it a virtual IP? What’s the purpose of this if cluster IP is already directing?
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  3. Seeya Xi-MSFT 16,456 Reputation points
    2021-09-06T07:58:17.113+00:00

    Hi @Sue_8827 ,

    1. How does this came about? I checked all other clusters I created none of them have this.

    I have attached screenshots, please check it out.
    129571-1.png
    129534-2.png

    Is it a virtual IP? What’s the purpose of this if cluster IP is already directing?

    Yes. The Windows cluster uses the virtual network name and virtual IP address as the interface to access it.

    If I misunderstood what you mean, please feel free to let me know.

    Best regards,
    Seeya


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  4. Limitless Technology 39,476 Reputation points
    2021-09-06T10:48:01.14+00:00

    Hello

    Yes you can remove it, but the cluster will not be accesble anymore through that IP until you set it up again manually for the node.

    https://learn.microsoft.com/en-us/powershell/module/networkloadbalancingclusters/remove-nlbclustervip?view=windowsserver2019-ps#:~:text=The%20Remove%2DNlbClusterVIP%20cmdlet%20removes,configuration%20on%20all%20cluster%20nodes.

    Best regards,

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