> ## Documentation Index
> Fetch the complete documentation index at: https://sambanova-systems.mintlify.site/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Network administration

The SambaRack SN40L-16 rack networking devices are preconfigured during installation. In some cases, administrators may need to perform limited post-installation administrative tasks, as described in this document. For additional details, refer to the [Third-party component documentation](/en/v1.2.0/sambastack/resources/thirdparty).

<Note>
  The Juniper QFX5130 port 16 will show an amber light. This is expected behavior and not a warning condition.
</Note>

## Password administration

<Note>
  SambaRack and Core Services Racks ship with default usernames and passwords for all devices. Please see SambaNova support KB article #1411 for the default credentials. Administrators are strongly advised to change these at the first opportunity.
</Note>

<Warning>
  SambaRack Manager must always be updated with the latest device credentials.
</Warning>

### Juniper EX series access switch and QFX5130 data switch

#### Step 1: Connect and configure the new password

Run the following commands:

```bash theme={null}
ssh root@<Juniper_switch_IP_address>
```

```text theme={null}
root@:RE:0% cli
root> configure
root# set system root-authentication plain-text-password
root# commit
```

#### Step 2: Log out

Log out of the switch by using the `exit` command three times:

1. To exit config mode
2. To exit operational mode
3. To exit the Linux CLI

#### Step 3: Verify the new password

Log back into the switch with the new password to confirm the change was successful.

#### Step 4: Update SambaRack Manager password vault

If SambaRack Manager is installed and set up, it must be updated with the latest credentials to ensure proper operations. See the [Set Secret](/en/v1.2.0/sambastack/hardware-admin/rdu-administration#set-secret) section for more details.

### Lantronix SLC8000 serial console server

#### Step 1: Connect and configure the new password

Run the following commands:

```bash theme={null}
ssh sysadmin@<Serial_console_IP_address>
```

```text theme={null}
> set localusers password sysadmin
> logout
```

#### Step 2: Verify the new password

Log back into the console server with the new password to confirm the change was successful.

#### Step 3: Update SambaRack Manager password vault

If SambaRack Manager is installed and set up, it must be updated with the latest credentials to ensure proper operations. See the [Set Secret](/en/v1.2.0/sambastack/hardware-admin/rdu-administration#set-secret) section for more details.

## Patching network devices

SambaNova provides a periodic patch release for network devices. See KB article #1062 "Listing and downloading available SN40L rack firmware" for details. Patch update release notes explain any variations from the processes provided in [Third-party component documentation](/en/v1.2.0/sambastack/resources/thirdparty).