> Source: [sk180446](https://support.checkpoint.com/results/sk/sk180446)

# sk180446 - Adding interface to existing cluster with Management API may fail following specific documentation example

| Property | Value |
|----------|-------|
| Solution ID | sk180446 |
| Date Created | 2022-12-26 |
| Last Modified | 2022-12-27 |
| Technical Level | General |
| Products | Security Gateway |
| Versions | R81.10 (EOS) |
| OS | Gaia |

## Symptoms

- This API command may fail:


`mgmt_cli set simple-cluster name "cluster1" interfaces.add.name "eth3" interfaces.add.ip-address "192.168.10.1" interfaces.add.ipv4-mask-length "24" interfaces.add.interface-type "`cluster`" interfaces.add.topology "INTERNAL" interfaces.add.anti-spoofing "true" members.update.1.name "m1" members.update.1.interfaces.name "eth3" members.update.1.interfaces.ipv4-address "192.168.10.2" members.update.1.interfaces.ipv4-network-mask "255.255.255.0" members.update.2.name "m2" members.update.2.interfaces.name "eth3" members.update.2.interfaces.ipv4-address "192.168.10.3" members.update.2.interfaces.ipv4-network-mask "255.255.255.0" --format json`

## Solution

This problem was fixed. The fix is included starting from:

* [Check Point R81.20 (Titan)](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk170416)

Check Point recommends to always upgrade to the most recent version   
([upgrade Security Gateway](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doShowproductpage&productTab=overview&product=435) / [upgrade Security Management Server](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doShowproductpage&productTab=overview&product=184) / [upgrade Multi-Domain Security Management](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doShowproductpage&productTab=overview&product=166)).

<br />

If you choose not to upgrade, this **workaround** is available:

1. Use this API syntax to configure the cluster interface (notice that the interface type is configured as "`private`"):

   `mgmt_cli set simple-cluster name "cluster1" interfaces.add.name "eth3" interfaces.add.ip-address "192.168.10.1" interfaces.add.ipv4-mask-length "24" interfaces.add.interface-type "`private`" interfaces.add.topology "INTERNAL" interfaces.add.anti-spoofing "true" members.update.1.name "m1" members.update.1.interfaces.name "eth3" members.update.1.interfaces.ipv4-address "192.168.10.2" members.update.1.interfaces.ipv4-network-mask "255.255.255.0" members.update.2.name "m2" members.update.2.interfaces.name "eth3" members.update.2.interfaces.ipv4-address "192.168.10.3" members.update.2.interfaces.ipv4-network-mask "255.255.255.0"`
2. Use this API syntax to configure the interface type as "`cluster`":

   `mgmt_cli set-simple-cluster name "cluster1" interfaces.update.name "eth3" interfaces.update.ip-address "192.168.10.1" interfaces.update.ipv4-mask-length 24 interfaces.update.interface-type "cluster" interfaces.update.topology "INTERNAL" interfaces.update.anti-spoofing true`

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