# Creating HVM Network

## About this task

You can create the following types of networks using the HVM plugin:

- Standard network
- Overlay network
- Data network
- Private network
- SR-IOV network

NOTE

- You cannot modify the CIDR after network creation. To modify the CIDR, delete the network and recreate with new CIDR value.
- You cannot modify the network name after network creation.
- For the Multi-network VM:
  - Configure the default gateway only on the first network interface.
  - Add static routes manually in the guest OS for additional interfaces.
- For the VLAN isolation in trunk or hybrid mode:
  - Observe VLAN isolation behavior in trunk or hybrid mode.
  - Identify Linux ARP flux as the cause of cross-VLAN reachability, due to the Linux weak host model (arp\_igonre=0 as default). Guest OS ARP settings update can resolve the issue.
  - Verify that OVS and ArubaCX enforce 802.1Q VLAN tagging.
- Networks with a defined VLAN ID, non-trunk configuration, and morpheus-hvm-network (or legacy embedded) metadata tag are discovered.
- Expect no Morpheus-side caching for Data, Private, and SR-IOV networks.
- Detect and validate any out-of-band hypervisor changes manually.
- The system retries the AddWorker operation up to the maximum configured limit. After it exhausts all retry attempts, the system raises a Morpheus alarm.

**Subtopics**  

- **[Creating HVM Standard Network](https://support.hpe.com/hpesc/public/api/document/sd00008058en_us/render?page=GUID-E49A87C2-E3E2-4C76-8F0D-FC232E8F5876.html)**
- **[Creating HVM Overlay Network](https://support.hpe.com/hpesc/public/api/document/sd00008058en_us/render?page=GUID-F20E32CC-E412-46E8-9735-064BB9A5C1D2.html)**
- **[Creating HVM Data Network](https://support.hpe.com/hpesc/public/api/document/sd00008058en_us/render?page=GUID-5D5881CB-FF9E-4836-B669-59085CD92F54.html)**
- **[Creating HVM Private Network](https://support.hpe.com/hpesc/public/api/document/sd00008058en_us/render?page=GUID-D2A7047B-FFC3-42BA-9E4B-6A6ED97679A2.html)**
- **[Creating HVM SR-IOV Network](https://support.hpe.com/hpesc/public/api/document/sd00008058en_us/render?page=GUID-1A9DC6EB-8D11-4539-8737-7B82CC3AF183.html)**
