topic Cant ping server over trunk port in Switching

Cant ping server over trunk port

Thomassimmons1987 — Sat, 16 Dec 2023 12:14:28 GMT

I am a beginner when it comes to vlans and this is hurting my brain. I am trying to access a server that I created a vlan for. When the port GigabitEthernet 1/0/3 is set to an access port on vlan 200, which is the vlan that I designated for my homelab, I can access the server. I also am trying to set up proxmox to allow vlan tagging in my VMs. To my understanding, I need to change the access port to a trunk port. When I do this, I am no longer able to connect to the server at 192.168.200.5 from my default VLAN. I also have a Unifi device that VLAN 200 is configured on as well as that is my router at the current moment. I will post my running-config and any other configs that are necessary to resolve. Thank you.

Current configuration : 2466 bytes
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! Last configuration change at 00:26:17 UTC Mon Jan 2 2006
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version 15.0
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
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hostname Switch
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boot-start-marker
boot-end-marker
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no aaa new-model
switch 1 provision ws-c2960s-48ts-l
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!
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spanning-tree mode pvst
spanning-tree extend system-id
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vlan internal allocation policy ascending
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interface FastEthernet0
no ip address
shutdown
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interface GigabitEthernet1/0/1 - This is the Unifi connection coming into the switch.
switchport trunk native vlan 200
switchport mode trunk
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interface GigabitEthernet1/0/2
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interface GigabitEthernet1/0/3 - This is the port in which the Proxmox server is connected.
switchport mode trunk
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interface GigabitEthernet1/0/4
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interface GigabitEthernet1/0/5
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interface GigabitEthernet1/0/6
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interface GigabitEthernet1/0/7
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interface GigabitEthernet1/0/8
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interface GigabitEthernet1/0/9
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interface GigabitEthernet1/0/10
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interface GigabitEthernet1/0/11
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interface GigabitEthernet1/0/12
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interface GigabitEthernet1/0/13
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interface GigabitEthernet1/0/14
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interface GigabitEthernet1/0/15
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interface GigabitEthernet1/0/16
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interface GigabitEthernet1/0/17
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interface GigabitEthernet1/0/18
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interface GigabitEthernet1/0/19
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interface GigabitEthernet1/0/20
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interface GigabitEthernet1/0/21
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interface GigabitEthernet1/0/22
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interface GigabitEthernet1/0/23
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interface GigabitEthernet1/0/24
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interface GigabitEthernet1/0/25
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interface GigabitEthernet1/0/26
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interface GigabitEthernet1/0/27
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interface GigabitEthernet1/0/28
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interface GigabitEthernet1/0/29
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interface GigabitEthernet1/0/30
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interface GigabitEthernet1/0/31
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interface GigabitEthernet1/0/32
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interface GigabitEthernet1/0/33
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interface GigabitEthernet1/0/34
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interface GigabitEthernet1/0/35
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interface GigabitEthernet1/0/36
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interface GigabitEthernet1/0/37
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interface GigabitEthernet1/0/38
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interface GigabitEthernet1/0/39
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interface GigabitEthernet1/0/40
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interface GigabitEthernet1/0/41
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interface GigabitEthernet1/0/42
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interface GigabitEthernet1/0/43
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interface GigabitEthernet1/0/44
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interface GigabitEthernet1/0/45
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interface GigabitEthernet1/0/46
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interface GigabitEthernet1/0/47
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interface GigabitEthernet1/0/48
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interface GigabitEthernet1/0/49
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interface GigabitEthernet1/0/50
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interface GigabitEthernet1/0/51
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interface GigabitEthernet1/0/52
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interface Vlan1
ip address dhcp
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ip http server
ip http secure-server
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vstack
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line con 0
line vty 5 15
!
end

Switch#

Re: Cant ping server over trunk port

MHM Cisco World — Sat, 16 Dec 2023 12:22:35 GMT

Can i see show interface trunk

MHM

Re: Cant ping server over trunk port

Thomassimmons1987 — Sat, 16 Dec 2023 12:24:40 GMT

Switch#show interface trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/1 on 802.1q trunking 200
Gi1/0/3 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi1/0/1 1-4094
Gi1/0/3 1-4094

Port Vlans allowed and active in management domain
Gi1/0/1 1,200
Gi1/0/3 1,200

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/1 1,200
Gi1/0/3 1,200
Switch#

Re: Cant ping server over trunk port

MHM Cisco World — Sat, 16 Dec 2023 12:27:48 GMT

Switch#show interface trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/1 on 802.1q trunking 200
Gi1/0/3 on 802.1q trunking 1

Can SW have two native vlan?

Sure NO' you need to match native vlan in all your network' in this SW and all other SW otherwise you will face same issue as you have

So change native vlan for trunk connect to server to be 1.

MHM

Re: Cant ping server over trunk port

M02@rt37 — Sat, 16 Dec 2023 12:28:06 GMT

Hello @Thomassimmons1987

Do you check within Proxmox, that the VMs are configured to use VLAN tagging if required.

Ensure that the VMs have the correct VLAN ID configured in their network settings.

Re: Cant ping server over trunk port

Thomassimmons1987 — Sat, 16 Dec 2023 12:31:23 GMT

Switch#show interface trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/1 on 802.1q trunking 200
Gi1/0/3 on 802.1q trunking 200

Port Vlans allowed on trunk
Gi1/0/1 1-4094
Gi1/0/3 1-4094

Port Vlans allowed and active in management domain
Gi1/0/1 1,200
Gi1/0/3 1,200

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/1 1,200
Gi1/0/3 1,200

I am still unable to access the server from default vlan with this.

This is the ping results...

ping 192.168.200.5

Pinging 192.168.200.5 with 32 bytes of data:
Reply from 192.168.10.1: Destination host unreachable.
Reply from 192.168.10.1: Destination host unreachable.
Reply from 192.168.10.1: Destination host unreachable.
Reply from 192.168.10.1: Destination host unreachable.

Ping statistics for 192.168.200.5:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Re: Cant ping server over trunk port

Thomassimmons1987 — Sat, 16 Dec 2023 12:43:57 GMT

I cant ping the proxmox host so I have errors somewhere, I just don't know where.

Re: Cant ping server over trunk port

MHM Cisco World — Sat, 16 Dec 2023 12:50:02 GMT

Friends changed defualt both trunk native vlan to 1

(200 was typo I correct it)

MHM

Re: Cant ping server over trunk port

Thomassimmons1987 — Sat, 16 Dec 2023 12:53:14 GMT

Changed both native vlans to 1 and still am unable to ping the server.

ping 192.168.200.5

Ping statistics for 192.168.200.5:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)

#show interface trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/1 on 802.1q trunking 1
Gi1/0/3 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi1/0/1 1-4094
Gi1/0/3 1-4094

Port Vlans allowed and active in management domain
Gi1/0/1 1,200
Gi1/0/3 1,200

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/1 1,200
Gi1/0/3 1,200
Switch#show vlan br

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Gi1/0/2, Gi1/0/4, Gi1/0/5
Gi1/0/6, Gi1/0/7, Gi1/0/8
Gi1/0/9, Gi1/0/10, Gi1/0/11
Gi1/0/12, Gi1/0/13, Gi1/0/14
Gi1/0/15, Gi1/0/16, Gi1/0/17
Gi1/0/18, Gi1/0/19, Gi1/0/20
Gi1/0/21, Gi1/0/22, Gi1/0/23
Gi1/0/24, Gi1/0/25, Gi1/0/26
Gi1/0/27, Gi1/0/28, Gi1/0/29
Gi1/0/30, Gi1/0/31, Gi1/0/32
Gi1/0/33, Gi1/0/34, Gi1/0/35
Gi1/0/36, Gi1/0/37, Gi1/0/38
Gi1/0/39, Gi1/0/40, Gi1/0/41
Gi1/0/42, Gi1/0/43, Gi1/0/44
Gi1/0/45, Gi1/0/46, Gi1/0/47
Gi1/0/48, Gi1/0/49, Gi1/0/50
Gi1/0/51, Gi1/0/52
200 Unifi active
1002 fddi-default act/unsup
1003 token-ring-default act/unsup

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
Switch#

Re: Cant ping server over trunk port

MHM Cisco World — Sat, 16 Dec 2023 12:59:03 GMT

You try ping server

192.168.200.5 using which IP? Which SVI?

Re: Cant ping server over trunk port

Thomassimmons1987 — Sat, 16 Dec 2023 13:10:58 GMT

This is the IP address I am pinging from. 192.168.10.15

When I set the SVI to 192.168.200.1, I am receiving a duplicate IP address error.

Re: Cant ping server over trunk port

MHM Cisco World — Sat, 16 Dec 2023 13:16:38 GMT

Connect PC to any free interface

Config this interfaces with

Interface fx/x

Switchport access vlan 200

No shut

Use IP in PC 192.168.200.100

Try ping now.

Why the previous ping failed, because the there is inter-vlan issues, I think you use different SW for inter-vlan?

MHM

Re: Cant ping server over trunk port

Thomassimmons1987 — Sat, 16 Dec 2023 13:20:31 GMT

Pinging 192.168.200.5 with 32 bytes of data:
Reply from 192.168.200.100: Destination host unreachable.
Reply from 192.168.200.100: Destination host unreachable.
Reply from 192.168.200.100: Destination host unreachable.
Reply from 192.168.200.100: Destination host unreachable.

Ping statistics for 192.168.200.5:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)

Even pings fail within the same VLAN.

Re: Cant ping server over trunk port

M02@rt37 — Sat, 16 Dec 2023 13:22:09 GMT

@Thomassimmons1987

On Unifi router you have an SVI 200 ? From this ip do you succeed to ping your VM ?

Re: Cant ping server over trunk port

MHM Cisco World — Sat, 16 Dec 2023 13:26:16 GMT

this via PC with IP 192.168.200.100 ?

Re: Cant ping server over trunk port

Thomassimmons1987 — Sat, 16 Dec 2023 13:30:18 GMT

Yes, that is correct. I think my UniFi device is messing this up.

Re: Cant ping server over trunk port

Thomassimmons1987 — Mon, 18 Dec 2023 17:10:15 GMT

I had a secondary switch in between the Cisco switch and my UniFi router. Once I tagged the traffic and reconfigured Proxmox to look for it, I was able to resolve.

thank you all for your help.

Re: Cant ping server over trunk port

M02@rt37 — Mon, 18 Dec 2023 17:32:28 GMT

Thanks for your feedback @Thomassimmons1987