Questions tagged [trunk]

For questions about trunks, layer-2 links across which traffic for multiple VLANs travel.

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1answer
27 views

VLAN not working in Comtrend switch

I'm trying to configure VLANs with 3 switches Comtrend (2- CNGE2FE8MSPOE + 1- CWGE26FX2TX24MSPOE) and it's not working as I expect. It's the first time that I work with VLAN and I don't know If I ...
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2answers
219 views

Can't add VLAN in the “allowed VLAN”

Why is this command not accepted? switchport trunk allowed vlan add 52,160,176,177,247 I tried adding only one VLAN; it's also not accepted. No error is shown or anything; it's just not showing when ...
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2answers
46 views

How to connect two different subnets

This may be a very basic question, but I'm a networking newbie. So I have the following setup: Server with one NIC on IP 192.168.10.1/24 (Network A). It is not possible to change this IP. Computer A ...
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2answers
72 views

How to monitor vlan using SMNP?

I am a newbie to building a monitor system using Prometheus and SNMP exporter, I have succeeded get metric from the physical interface, but I want to monitor VLAN on a trunk port, is that possible ? ...
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2answers
111 views

Cisco router on a stick with public ip wan (ISP)gateway

I am trying to create a router on a stick with an outside facing sub-interface with a public IP from an ISP. I have tried to configure NAT and routing but I just cant get to ping the internet. I'm ...
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2answers
58 views

I cannot Encapsulate on Router

I have VLAN10 and VLAN20, I am trying to communicate between computers with the same VLAN on the following setup: I want to apply encapsulation from Router but it doesn't seem to recognize ...
1
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2answers
48 views

VTP pruning used in combination with allowed vlan

I have a network on which most of the switches are running VTP client/server mode. Few switches are not yet in that mode - for specific customization or because they simply cannot handle it. Thinking ...
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1answer
961 views

difference between switchport trunk encapsulation dot1q and switchport mode trunk

I am new to network engineering and I am currently delving deep into L2 functionality.what is the difference between these two commands: 1 switchport trunk encapsulation dot1q 2 switchport mode trunk ...
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1answer
72 views

Trunking multiple VLANs into a single trunk port on a 3650 Switch

Morning: I'm new to the world of Cisco Packet tracer, and I am creating a network for a uni project. So far, what I have is: 5 VLANs (subnetted to 192.168.2.0/26, 192.168.3.0/36 etc) All are ...
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1answer
98 views

Why some situations, PC can connected to trunk port and work fine?

I want to know about tagged and untagged vlan mechanism then I try to configure like this When I connected PC3 to trunk port on Packet Tracer, It doesn't work and a switch dropped PC3's frame if I ...
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2answers
72 views

ping in the same VLAN with multiple switches in between

Refreshing VLAN knowledge with PT7.3, I came across some unexpected behavior. Why does a chain of switches having proper trunk configuration between them DROP packets? Trying to ping hosts from the ...
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2answers
39 views

If we already have default VLAN, Why we need Native VLAN? [duplicate]

What is the need of Native VLAN and default VLAN. How they are related? Can Somebody explain this in detail?
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2answers
40 views

IOS. Whats the difference between these 2 commands

I am completing an online course for the network+ and am going through one of the labs. Here is a diagram of the network in question. Specifically I have a switch with 24 fast ethernet ports and ...
0
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1answer
161 views

Why can't I connect to PfSense via the switch?

Our current firwall is deprecated and we decided to exchange it with an PfSense server. In my test setup I configured the interfaces as follows: igb0 = WAN enabled igb1 = LAN (should be VLAN trunk ...
3
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1answer
89 views

cisco switchport trunk native vlan

we have switch catalyst 3850 and we need to enable the PXE boot on a port configured in trunk with configured three VLAN (4040, 4050 and 4060). To permit the PXE boot and deploy to work we set on the ...
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1answer
43 views

How to define trunk port between vmware esxi host 6.5 and switch? [closed]

I create some virtual machine in different vlan but i can not set trunk port from vmware to transfer vlan information.
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1answer
121 views

Removing VLANs from core trunks (.1q)…?

I am a little embarrassed I do not know the answer to this already, well I think I know the answer but I am not 100% sure and this I need to be 100% sure on. We have several core .1q trunks that we ...
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2answers
564 views

Can a single subnet work across several switches?

New to networking and studying hard but limited access to a kit to try things at the moment... My question is - if I had, for example, two Layer-2 switches cable connected, could I have devices on ...
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3answers
3k views

Operational mode is down for one link

I am setting up a simulated Cisco Packet Tracer with three Cisco Catalyst 2960 switches S1, S2 and S3. S1 being the trunk for S2 and S3. I have three(3) interfaces F0/6, F0/11, F0/18 that are ...
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2answers
796 views

Create a dead end vLAN for untagged/native between Aruba and Cisco switches

I would like to use a dead vLAN as the native/untagged vLAN on trunk feeds as a security best practice. The trunk feed is between a Cisco and Aruba switch. On Cisco switch, the vLAN is left out of the ...
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2answers
107 views

Partitioning between VLAN in a Trunk switch architecture

Supposing we have a Trunk switch architecture with multiple VLANs as shown below : A computer that belongs to the VLAN1 on the first switch (from the left) will be able to communicate with the VLAN1 ...
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2answers
540 views

Feeling lost troubleshooting Trunk and STP configurations on Packet Tracer

I couldn't identify the mistake or what I have missing in the configuration on this network, if anyone of you is welling to check it out this is the link PacketTracerFile I could not ping from any PC ...
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1answer
43 views

Routing between 2 VLANs with one HP Switch

I need help with VLAN: I have a WiFi AP with the IP 192.168.100.190. There are 2 SSIDs with VLAN 1 and 2 created. As a router I have a Sophos UTM with the IP 192.168.100.199. Furthermore, I have an ...
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1answer
189 views

What is VLAN Hopping

I am starting on my journey into the world of Networking and have come across a term called VLAN hopping. The sentence I read was that if the Native VLAN on two switches connected to each other via ...
3
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1answer
2k views

spanning-tree port type edge trunk on port-channel vs physical interface

If i configure spanning-tree port type edge trunk on physical interface instead of port-channel does that work? Or i have to do spanning-tree port type edge trunk on port-channel ? Example: ...
0
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1answer
63 views

Why Access ports should have the same trunk native vlan? [closed]

In the current switch Management VLAN is 48. Can you please someone explain it to me, why we dont give trunk native VLAN as 48, and we configure the same as access VLAN? Thanks in advance.
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1answer
1k views

Why STP has to be disable on Trunk Ports?

I have 5 Switches on a Private Network 10.0.0.0/8 with 8 Vlans. On Access ports is running Rapid STP. On Trunk Ports between Switches should i disable STP or not? I would be very pleased if someone ...
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4answers
82 views

Confused in using the ports for trunking mode

The ports are as follows: for the switch on the left side the upper port is fa0/1, below it is fa 1/1 and below fa1/1 is fa2/1. For the switch in the middle the left port is fa0/1 and the right port ...
4
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1answer
501 views

Best Practice for Voice and Data VLAN on single port

We have multiple interfaces currently configured with the below on our Cisco 3750x switch. interface GigabitEthernet1/0/21 switchport access vlan 4 switchport trunk encapsulation dot1q switchport ...
4
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2answers
1k views

Portfast on Trunk port

Why shouldn't I activate portfast on a trunking port for a Cisco switch? I do understand that it could cause a loop on the the network, but I still cant wrap my head around the concept.
3
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3answers
6k views

Aren't Switch Access ports tagged?

I've read where frames are tagged only when going over a trunk and that Access ports do not tag frames. But don't Access ports actually tag frames? When I configure a particular port to be in a ...
3
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3answers
861 views

Do VLANs within a subnet need to have their own subnet for router on a stick?

I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to ...
5
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1answer
388 views

Assigning a single switchport to different VLANs

I've been trying to figure out how to achieve the outcome below. VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- ...
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1answer
60 views

when to make a port dynamic desirable instead of trunk?

i'm reading CCNA stuff and just got stuck in this issue: i read some articles about DTP and trunking but didn't understand when to make a port trunk and when make it dynamic desirable ? in what case ...
0
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1answer
637 views

Quanta LB6M : how to make trunk port

My hardware is (quanta10g-uha) #show hardware Switch: 1 System Description............................. Quanta LB6M, 1.2.0.14, Linux 2.6.21.7 ...
1
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1answer
103 views

Dhcp Broadcast Through Switches

Think of a pc connected to switch1. Sw1 is connected to sw2(trunk port on both switches) and sw2 is connected to a router(dhcp server). Pc sends a dhcp broadcast. Does sw1 passes the broadcast through ...
4
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1answer
191 views

What are reasons to configure a Voice VLAN using the Auxillary VLAN feature instead of a Trunk + Native vLAN

Imagine this topology: [PC] ------- [VOIP Phone] ------- [eth0/0 on a Switch] And this configuration on the switch: vlan 22 name DATA vlan 33 name VOICE There are two ways to have both the PC'...
7
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4answers
450 views

Building too large for ethernet runs

I'm pretty new to network design. I know enough to wire small buildings and such, but I'm puzzled as to how work this one out. A building I'm working on is an odd shape, and very large. ...
2
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4answers
816 views

Trunk link between Cisco switches does not allow internet to the end users

I have a issue in my network. In terms of OSI I am OK in the physical layer. My link is OK because I tested connecting a computer on a fiber link, and I was able to surf the Internet, but when I make ...
1
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1answer
149 views

VLAN configuration help

I am lost on this, and I could use a bit of help. I have one PC that I want to isolate on my network on its own VLAN. Here is a rundown of my equipment: Netgear GS752TP Switch Cisco RV120w Router ...
1
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1answer
2k views

QinQ and selective QinQ

What is difference between QinQ and selective QinQ ? We need to configure selective QinQ VLAN trunk between our setup. Please help in selective QinQ .
2
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2answers
1k views

VTP: VLAN is not propagating

This Topology is simple but my VLAN is not propaganting. I'm following this Tutorial Multilayer Switch0 VTP Version : 2 Configuration Revision : 2 Maximum VLANs ...
2
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3answers
8k views

Tagged vs Untagged Question [duplicate]

Since I'm a noob, I'm unable to post a follow up question on the following question... Why and how are Ethernet Vlans tagged? In my image, I believe I have correctly depicted how tagged networking ...
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2answers
4k views

VTP and VTP domain

Does a VTP server switch, with a VTP domain configured on it, advertise the VTP domain name to a client switch, so that the VTP domain is automatically configured on client switch?
2
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1answer
298 views

HP V1910 - Why is tagged traffic going to VLAN1?

HP(3Com) V1910 switch with 2 vlans: VLAN1 (native) and VLAN191 The Trunk Port is configured like this: Why are frames tagged for '191' also being forwarded to VLAN1? Any ideas. Thanks
1
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2answers
2k views

How do I remove a vlan from a trunked port

I had a question about a vlan I accidentally added a port to. I have a cisco 2960x 48 port switch. I entered the incorrect port and added it to our wireless vlan. The port is a trunked port to my ...
4
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2answers
620 views

VLAN Tags Being Different for a VoIP Phone vs. the Host Daisy-Chained to it?

I've recently began working for a VoIP Provider and I am constantly seeing VoIP Phones pulling different VLANs than the Host that is connected to it i.e. daisy-chained. When I've tried to look more ...
5
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2answers
3k views

How far is VLAN broadcast propagated?

I'm not 100% sure of the vocabulary, so please bear with me. Suppose I've set up some new VLANs to better divide my network logically. I have a 4507 as a core network switch with VLANs 1 and 10-19. ...
4
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5answers
1k views

Are there any security advantages to activating VLAN tagging?

I understand the concepts of generating a VLAN. However, on a small, closed, sophisticated network, are there any security advantages to activating VLAN tagging?
5
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2answers
5k views

How to encapsulate all VLAN traffic inside VXLAN

As I understand VXLAN, it looks like it should be able to encapsulate and properly route VLAN-tagged traffic. However, in investigating how to actually configure VXLAN on network devices, it looks ...