Questions tagged [vlan]

For questions about Virtual LANs (VLANs) which are used to divide what otherwise would be a single OSI layer-2 broadcast domain into multiple, logical OSI layer-2 broadcast domains.

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26 views

Is it possible to configure DHCP on a router or UTM firewall for the multiple VLANs on L3 Switch?

I'm working on expanding our office network to accommodate more users/devices. Currently we have the DHCP configured on a UTM firewall(cyberoam ing50) device(cum router) providing IP addresses for ...
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0answers
6 views

connecting 2 VLANs in kathara [closed]

I'm currently using kathara to simulate network environments using bare metal Linux (with iproute2). I have 3 different VLANs each that work through 2 access switches and those through 2 distribution ...
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1answer
59 views

Cisco IPsec VPN tunnel problem

I have a problem with VPN configuration. This is the topology I created: First updated licenses to make the VPN available: license boot module c1900 technology-package securityk9 IPsec Router ...
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1answer
42 views

Cisco IOS Software [Everest], ISR 4331. Vlan+Vrf+Dhcp

I'm looking after to use a setup with that objectives in mind: Create a subinterface on interface GigabitEthernet0/0/1 create a Vlan and assign it to that subinterface create a vrrf and assign it to ...
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1answer
23 views

Port only in trunk mode vs encapsulating the frame

A network with 2 switches, each switch has 2 vlan, one called vlan 10 and another vlan 20. A port-channel with 2 uplinks (trunk). Why in a layer 2 scenario I don't need to configure the trunks with ...
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1answer
30 views

STP with Vlan, uses normal configuration only?

In a network with redundant vlan trunks, does the STP run normally on the trunks or does it need to do any more configuration? Thanks!
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3answers
37 views

L3 switch vlan routing to another gateway

I have a allied telesis switch with VLAN10 & VLAN 20 and a basic ISP Router with no VLAN configuration. ISP router IP is 172.30.50.253 PC1: 172.30.3.x/24 Gateway 172.30.3.254 VLAN30 interface ...
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2answers
33 views

Per-VLAN DHCP pools on the switch

Let us say I have a switch on which I have created two VLANs 10 and 20. I have set ports 1-10 to be on VLAN 10 and ports 11-20 to be on VLAN 20. Presently the PCs in both VLANs are configured with ...
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3answers
55 views

How to create/delete multiple VLANs in a single command?

If I want to create 3 VLANs, I've to do it one by one like this. conf t vlan 2 vlan 3 vlan 4 Same thing goes with deletion. conf t no vlan 2 no vlan 3 no vlan 4 Is there a way to do it in a single ...
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0answers
13 views

Why does Cisco recommends NOT to use VLAN 1 as Management VLAN? [duplicate]

According to the following article; https://www.omnisecu.com/cisco-certified-network-associate-ccna/what-is-management-vlan-and-how-to-configure-management-vlan.php Cisco recommends NOT to use VLAN 1 ...
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2answers
300 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
40 views

Need explanation on vlan tag/ip mismatch

What happens if I have a switch configured with an accessport on vlan 20 and someone uses a static ip in a different subnet. vlan 20 has the subnet 192.168.20.0/24 in the router. Suppose the ip used ...
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2answers
53 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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4answers
523 views

Difference between SVI and subinterface

Modern multi-layer switches seem to support both SVIs (switch virtual interfaces) and subinterfaces concepts. Both are virtual layer 3 concepts used to perform routing functions and some equipment ...
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1answer
39 views

Interconnecting sites with different networks and VLANs

I've got three sites, let's call them Production Plant, Remote 1 and Remote 2. They're not big networks. The Production Plant has two internal networks that has control systems designed for all being ...
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1answer
35 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
55 views

Some extra clarification regarding VLANs and SVI

Good afternoon guys, I've got a question regarding VLANs and SVIs. First of all, I know some concepts about VLANs, and I've been in the IT field for a while. But this one is a bit confusing for me. ...
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2answers
34 views

Add allowed vlan to vlan.dat automatically

I have a switch configuration for a Cisco 2960cx that allows a specific VLAN on a trunk but no interface on the switch explicitly accesses that VLAN. So when the configuration is ran for the first ...
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2answers
98 views

Loopback interface

I have a theoretical question about the loopback implementation on a router. I understand that the idea of a loopback interface is that it is a virtual interface which never goes down due to a ...
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1answer
67 views

Duplicated Vlan ID

I have one flat network with our data center and it is causing as a lot of issues, so i had to design a new network to separate the buildings from the data center, when I designed the new network i ...
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1answer
66 views

VRF - How does a router select the VRF a packet belongs to?

Let's assume we have a switch connected to 2 hosts through 2 VLANs. And the switch is connected to a router (1) which handles VRF. Let's assume Router 1 and Router 2 implement two VRF: VRF_Red and ...
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0answers
22 views

HPE V1910 VLAN configuration [closed]

I have a HPE v1910 switch for my network. I am creating 5 VLANs on it for my purposes: VLAN 11- ports 9/10, port 10 has a Linux box and port 9 is connected to an external device. VLAN 12- ports 11/12,...
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2answers
30 views

Setting up a secure LAN within an existing not owned LAN [closed]

Shown in the figure is a univercity network. The devices inside the red boxes are owned by the laboraroty in which I am working. I want to setup a secure subnet for all devices that are within the red ...
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3answers
102 views

What device manages VLANs?

I understand what a VLAN is and what purpose it serves. However, I'm having a difficult time understanding where VLANs orginate. Specifically, I know CISCO firewalls, switches, and routers all deal ...
2
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1answer
80 views

Can modern network equipment handle very large broadcast domains

We operate a network where we have 'tons' of VM servers that are physically hosted on many many blade chassis. The thought behind the original design was to simply put them in one very large ...
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2answers
75 views

Intermittent Network Performance Problems

I've been dealing with an intermittent issue in my network for several weeks now. Symptoms: Periodic "Destination host unreachable.", and similar errors when pinging. The following is ...
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1answer
57 views

Why there's no “show vlan” command on my Cisco NCS-5001?

I'm trying to learn my way around Cisco switches by watching an online course [1] and trying the commands from there on a switch I have access to. One of the first commands I've tried, show vlan ...
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2answers
64 views

Help segmenting/isolate my network with VLANs [closed]

I have a couple of IP cameras (live view and recording via an NVR) and DVR (with analogue cameras) connected by ethernet on my network. Nothing is separated atm; i.e. everything can access everything ...
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1answer
109 views

Best practice / advice for cisco 3560 behind Virtualised OPNsense

Currently I run the below scheme. The problem is that when ESXi is down it takes down all the network with it, so I have to boot up another router to log in to it. WAN > OPNsense (in ESXi)> ...
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1answer
44 views

When creating a LAG, what VLAN conditions should be satisfied?

There are two interfaces which are to be added in a LAG. The attributes which should be same are speeds and MTU values. What about physical interfaces which are in different VLANs. For example, Port 1 ...
2
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1answer
188 views

How to capture mixture of packets with and without VLAN tag over LACP with tcpdump?

Given following configuration in Linux: bond0 in LACP (802.3ad) mode with two VLAN networks running over it. bond0.111 configured with static IP bond0.222 configured with DHCP How to capture packets ...
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1answer
73 views

VLAN Filtering not working

On Cisco devices I'm looking to enable some filtering for one specific vlan (id 110). Here is my config : (192.33.57.177 is the DHCP server host) ip access-list extended VLAN110-DHCP permit ip any ...
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0answers
35 views

STP configurations

In my design, there will be a few be a few rings of edge switches that are connected to my distribution switch. (alcatel 6860-U28) The distribution switch will then be connected to my core router ( ...
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2answers
96 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 ? ...
0
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1answer
28 views

BPDU Header System ID Extension

Previously network switches was using the 8 byte field Bridge Priority to identify a root on the network.When networks grows and becomes complex vlan creation comes into play the 2 bytes Bridge ...
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2answers
37 views

Private VLANs Same As VLANs!

The common VLANs provides a layer 2 speration flooding and broadcasting is limited to each virtual lans. Im wondering what is the purpose of the private VLANs also the secondary VLANs (isolated and ...
1
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2answers
61 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 ...
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1answer
56 views

Question about vlans

as I know devices in the same VLAN should be in the same subnet too, but this kind of scenario is nonsense, what is the solution ?,
1
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1answer
122 views

PAT with multiple VLAN

I've set up a network with 4 VLAN, 3 VLAN configured PAT on it and 1 VLAN configured STATIC NAT. The router is acting as the DHCP server. Outside of my router I have another router acting as "the ...
0
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1answer
1k views

intervlan routing with PfSense

I Need some guidance on getting my lab networking configured. Any support is appreciated. My Lab consists of: 2 cisco switches: 2960s(access layer 2) and 3750X(ip routing/layer 3) Xenserver with ...
0
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2answers
86 views

Access printer in VLAN1 from VLAN2

I have a network printer (Brother MFC-L8690CDW) connected to Cisco RV340W (with latest firmware) on VLAN1. I have installed driver and it works as usual no issues there. Now we have created VLAN2. My ...
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3answers
489 views

Cisco SG-350 Switch and Fortigate Firewall Configuration

I'm not what you would call a Network Engineer, but right now i have a (somewhat) complex network problem that i have to solve. I must configure a SG-35028p cisco switch and a fortigate 60f firewall ...
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0answers
18 views

Please correct my VLAN conception [duplicate]

As I know VLAN is a control function for layer 2 engine. I think VLAN in layer 2 is cutting switch ports as group and specify trunk port in layer 1. So VLAN ID in layer 2 means each VLAN pool identity ...
0
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1answer
59 views

How can i make every network on this topology speak together?

i'm working on this topology for so long and i didn't manage to make every network speak together with different VLAN on each network. On this topology: When i trace a packet sent from PC3 to PC4, ...
0
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1answer
82 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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0answers
8 views

Computer getting Unable to Identify Network UNLESS Vlan is changed [closed]

This is a problem that has long plagued this environment. At seemingly random times (measured generally in months), a computer may suddenly lose connectivity to the network. It still is able to send ...
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3answers
64 views

Site-to-site IPSec tunnel over Load balancer

I'm having a following topology Could this be archived? I've configured this network, but routing between the two VLAN-s are not working. Using Ubiquity Edge X routers. Could this be archived with ...
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2answers
77 views

Network topology for merging two different layer 2 networks

I have a scenario, (shown in attach diagram) where i need to merge traffic from two server 1 , 2 to target server 3. All three are on different vlans/subnets. With layer 3 switch in between would it ...
0
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1answer
132 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 ...
2
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1answer
56 views

Why can my device not get an ip from DHCP in a network with 2 VLANS of which one has DHCP?

In our company we have a CISCO 2811 Switch accompanied by an HP1920 Switch. Our current configuration consists of 2 VLANS: VLAN-2 that has no DHCP in IP range 192.168.0.0/24 VLAN-5 That contains DHCP ...

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