0:03 Select a configured device and open the SNMP browser from the topology toolbar.

0:11 Use a permitted SNMP version and the credentials configured on that device.

0:20 Browse the MIB tree to inspect an object’s identifier, syntax and access level.

0:31 Enter the complete instance identifier and use Get to read the device name.

0:44 GetNext reads the next available object after the supplied identifier.

0:54 Walk reads the objects below a selected branch.

1:04 GetBulk retrieves multiple results in a single operation.

1:19 A missing object is reported separately from a query rejected for invalid credentials.

1:32 Read the interface descriptions before choosing an interface index to change.

1:43 Use Get to check that interface’s administrative status before changing it.

1:55 A read-only community can read this object but cannot change its value.

2:09 With a permitted write community, set the administrative status to down.

2:20 The device console confirms that the interface is now administratively down.

2:43 Restore the interface to up, then read its status back.

2:50 Refresh repeats the last read operation, so it does not repeat the previous write.

3:03 The console and a successful ping confirm that the restored link is working.

3:17 For SNMP version three, choose a configured user and the appropriate security level.

3:29 This user can read the device name through its permitted view.

3:40 A query outside that view is denied, with the deciding view and reason shown.

3:49 Authenticated security levels require the corresponding passphrase fields.

3:56 This browser checks presence, not passphrase correctness; it does not prove encrypted SNMP authentication.

4:08 If a device has no configured agent, the MIB tree remains browsable but queries are disabled.

4:27 Finish with the changed interface restored and use permitted credentials for further queries.