Please tell me that the cisco 350 doesn't come with the vlan 900, only the vlan19 - the PC is available, the port is still broken from time to time, for whatever reason?

[Translator]

vlan19 - Computer  /  vlan 900 - Internet Telephony

cisco350#sh ru
config-file-header
cisco350
v3.0.0.69 / RCBS3.0_930_770_008
CLI v1.0
file SSD indicator encrypted
@
ssd-control-start
ssd config
ssd file passphrase control unrestricted
no ssd file integrity control
ssd-control-end cb0a3fdb1f3a1af4e4430033719968c0
!
!
unit-type-control-start
unit-type unit 1 network gi uplink none
unit-type-control-end
!
vlan database
vlan 19,900
exit
voice vlan id 900
voice vlan state oui-enabled
voice vlan oui-table add 0001e3 Siemens_AG_phone
voice vlan oui-table add 00036b Cisco_phone
voice vlan oui-table add 00096e Avaya
voice vlan oui-table add 000fe2 H3C_Aolynk
voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
voice vlan oui-table add 00d01e Pingtel_phone
voice vlan oui-table add 00e075 Polycom/Veritel_phone
voice vlan oui-table add 00e0bb 3Com_phone
no lldp run
bonjour interface range vlan 1
hostname cisco350
username adm01 password encrypted $15$+YFXzTJNGotMalEP$MBq0NaPOeFKcaG64S5kyWcbFuZ4mrolBojJi1ZmV0qNCzvjRYKxDquO9D4q5E66gnAP9pvHGt0tJLkWWap9w3g== privilege 15
!
interface vlan 1
shutdown
!
interface GigabitEthernet1
spanning-tree portfast
switchport access vlan 19
voice vlan enable
!
interface GigabitEthernet2
spanning-tree portfast
switchport access vlan 19
voice vlan enable
!
interface GigabitEthernet3
spanning-tree portfast
switchport access vlan 19
voice vlan enable
!
interface GigabitEthernet4
spanning-tree portfast
switchport access vlan 19
voice vlan enable
!
interface GigabitEthernet5
spanning-tree portfast
switchport access vlan 19
voice vlan enable
!
interface GigabitEthernet6
spanning-tree portfast
switchport access vlan 19
voice vlan enable
!
interface GigabitEthernet7
spanning-tree portfast
switchport access vlan 19
voice vlan enable
!
interface GigabitEthernet8
spanning-tree portfast
switchport access vlan 19
voice vlan enable
!
interface GigabitEthernet9
switchport mode trunk
switchport trunk native vlan 900
!
interface GigabitEthernet10
switchport mode trunk
!
exit

cisco350#sh vlan
Created by: D-Default, S-Static, G-GVRP, R-Radius Assigned VLAN, V-Voice VLAN

Vlan   Name    Tagged Ports    UnTagged Ports Created by
---- ----------------- ------------------ ------------------ ----------------
1         1          gi9 gi10,            Po1-8               D
19       19        gi9-10               gi1-8                S
900     900      gi10                   gi9                    S

cisco350#08-Feb-2023 02:50:09 %LINK-W-Down: gi2
08-Feb-2023 02:50:40 %STP-W-PORTSTATUS: gi2: STP status Forwarding
08-Feb-2023 02:50:40 %LINK-I-Up: gi2

[pieterh]

you configured an explicit trunk on port-9,
   interface GigabitEthernet9
   switchport mode trunk
but not an explicit access port on the other, so there will be periodically negotiated for trunk/access
be aware! voice vlan only works on access ports.
   interface GigabitEthernet8
   switchport mode access    ! <- add this command to your ports

[Translator]

switchport mode access per port And save, again, sh run can't see with switchport mode access, these ports are a computer vlan and an Internet phone vlan, a computer vlan is ok, Internet phone constantly appear below

13-Feb-2023 06:43:32 %NT_GREEN-W-EeeLldpSingleNeighbour: Single LLDP neighbour on port gi6 - EEE operational state can be TRUE

13-Feb-2023 06:43:34 %NT_GREEN-W-EeeLldpMultiNeighbours: Multiple LLDP neighbours on port gi6 - EEE operational state is FALSE

13-Feb-2023 06:43:37 %NT_GREEN-W-EeeLldpMultiNeighbours: Multiple LLDP neighbours on port gi7 - EEE operational state is FALSE

13-Feb-2023 06:43:41 %NT_GREEN-W-EeeLldpSingleNeighbour: Single LLDP neighbour on port gi5 - EEE operational state can be TRUE

13-Feb-2023 06:43:46 %NT_GREEN-W-EeeLldpMultiNeighbours: Multiple LLDP neighbours on port gi5 - EEE operational state is FALSE