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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VLAN trunking - how to ping PC4 from PC1?

I'm still a beginner with VLANs and trunking, and I'm trying to get this topology working. Specifically, I am unable to ping PC4 (10.0.10.11/32) from PC1 (10.0.10.10/32), despite both of them being on ...
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Dlink Voice and Data Vlan on Same port [closed]

I have DLINK DGS-1210-52 I tried to follow the document https://eu.dlink.com/uk/en/support/faq/switches/layer-2-gigabit/dgs-series/es_dgs-1210_como-configurar-voice-vlan that Dlink provided. I have ...
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VXLAN Use Case For Enterprise Networks [closed]

Implementation of VXLAN is more complex than a standard Ethernet topology implementation and is said to be intended for deployment in large data centers. Virtual Extensible LAN (VXLAN) is a network ...
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3 votes
5 answers
159 views

Why should I use vlans instead of subnets?

I know that this might be a trivial question for the more experienced. However, I am a student who has just started designing networks. Assuming you have to design a network of a school divided into ...
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How to create a subnet or secondary network? Do I need VLANs?

I am not new to IT, but in the past, I've always had a Network Admin to handle this type of stuff. That being said I know just enough to be dangerous. What I have is an old hodgepodge of different ...
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1 answer
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How to configure a layer 3 switch for routing vlans?

I have set up the router as a dhcp server and I would like to use the layer 3 switch to route each PC in seperate vlans. How do I configure the router and L3 switch for inter vlan routing ? the router ...
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3 votes
1 answer
67 views

VLAN Ingress filtering process on switch

I read and read the information and somehow it is inconsistent or incomplete. The specification of 802.1Q also read, but to me as a person who has not previously read the specification is difficult. I ...
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2 answers
48 views

How to redirect traffic when one site goes down without downtime and the subnets are different?

We have a uniform high availability configuration [somewhat like 1] with the difference we have two different subnets, vlan and vsphere for two different sites, X and Y. The host in site X has ip 10....
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1 answer
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VLAN routing on the same subnet

Consider following situation: You have 10.3.0.0/16 network without any VLANs. Now You want to divide it... You want Your IT department be able to reach the entire network, but sales department only ...
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1 answer
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Managed Switch, Setting up VLAN Tagged, Untagged, allowed & tagged only etc

Looking for some help setting up a Dell PowerConnect 2724. 1st time setting one of these up. The best graphic I could find to explain my setup: My router DHCP is enabled so it will provide IP ...
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4 votes
1 answer
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How Can a VPC ping the Router through an Etherswitch that behaves in one port as router and in the other as switch

In the following topology my main purpose is to: 1)PC11 ping Router(R) 2)PC11 ping PC13 ESW10: In gig0/3 has the no switchport command and a given IP address. In gig0/2 it has the switchport access ...
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Questions about how does the native VLAN work [duplicate]

I am studying about VLANs at the moment and I have a few questions regarding native VLANs and their purpose. I've read that they are used to carry untagged traffic, and that the native VLAN is ...
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1 vote
1 answer
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Cisco ISR 4000 series with SM-X Layer 2/3 module

I have a Cisco SM-X-16G4M2X Layer 2/3 Service Module installed in an ISR 4000 series router, and I would like to configure its ports as level 2 in a vlan, and then configure that vlan with an IP ...
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2 answers
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Question about subinterface DHCP relay CISCO

I want to make 4 PC got DHCP IP address No problem with left side, but right side 2 PC can't get IP automaitic. I think the problem is DHCP Relay. How can I use ip helper-address for subinterface of ...
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1 answer
31 views

BACnet broadcasts with 2 subnets on one VLAN

I have a building automation network configuration with mechanical equipment on subnet 10.233.138.0/24 and electrical equipment on subnet 10.233.136.0/23. BACnet uses broadcasts for certain functions ...
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1 answer
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HP FlexFabric 5700 (Comware) VLAN 1-to-1 Mapping. ISP assigned vlan I already use

I have a new feed from an ISP, that would be slow to respond to any change requests. They tagged this drop with a vlan ID of 10, which I happen to already be using on my switches. I want a brand new ...
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1 answer
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Routing for same subnets in remote sites

Is it possible to have interVLAN routing with router on a stick topology, but with remote sites communicating via OSPF? In the diagram below, I can ping PC1 from PC0. What I want is to ping PC2 and ...
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1 vote
1 answer
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Trunk seems to be allowing all vlans

Got a catalyst 2690 on a small office net consisiting of 2 vlans, 10 and 20, 10 for the lan and corporate wifi and 20 fot guests wifi. All lan ports are config on access mode vlan 10 The access point ...
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3 votes
1 answer
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QinQ tunneling more than one VLAN as a provider + is it possible to send QinQ tunneling on the same port where L2 tagged works

I have done some QinQ's tunneling in my history but always there was only one customer, so situation was clear for me how to configure it. I mean access dot1q port to the customer and the rest are ...
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0 answers
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How to set the default VLAN on Cisco SG350 switches firmware 2.5.0.83

We've got a site with all its Cisco SG300 network switches configured with a custom default VLAN. Normally, we'd use the following commands to change the default VLAN: vlan database default-vlan vlan ...
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1 vote
0 answers
25 views

asa vlan subinterface over s2s ipsec tunnel to IOS router

I am trying to configure wireless traffic that is a separate vlan subinterface on an ASA to travel over a site-to-site vpn to an IOS router. i have the static NAT set up to go from the (wifimain,...
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2 votes
1 answer
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Why does 802.1ad exist?

Main Question: I'm wondering why the IEEE standard 802.1ad, which specifies the TPID of a S-VLAN as 0x88a8, for double tagged vlans exists, when it's also possible to just use two 802.1Q tags with the ...
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Tagged-only VLANs

I have an HP ProCurve swicth configured as follows (simplified, with U for Untagged and T for Tagged): VLAN_1: U 1,3,5,7-10,12-16 T 2,4,6 No U 11 VLAN_2: T 1,3,5 VLAN_3: T 1,3,5 What is the purpose ...
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1 vote
2 answers
47 views

Best way to configure layer 2 daisy chain with 2 layer 3 switches/gateways at either end?

I would like to implement a linear daisy chain for the purpose of transmitting internet over a considerable distance. One motivation behind the use of a linear daisy chain for this problem is that ...
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2 answers
82 views

Sharing one VLAN with two routers each one will route different subnet

We are transitioning to new WAN connectivity. I have one VLAN (let's say ID 10). Currently there is one router R1 that has one private subnet and one public subnet on the VLAN 10 which goes through ...
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2 votes
0 answers
27 views

Cisco C9300 Drop Out And VLAN Table Loss

I have a Cisco C9300 is one of my main racks. Recently it has been restarting on it's own. My suspicion that the PSU is on the way out. Strange part is when it does this the VLAN table resets to ...
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  • 389
0 votes
1 answer
41 views

My PC won't ping my router

I'm trying to get my PC to ping the router. The configuration on Fa0 of my router is interface FastEthernet0 switchport access vlan 100 switchport mode trunk and vlan 100 is interface Vlan100 ...
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1 answer
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Gateway with multiple VLAN IPs on one NIC [closed]

I would like to separate several hosts from the local network and put them behind a firewall. I would like to use VLANs to "physically" separate them instead of using just different subnets. ...
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0 votes
1 answer
142 views

Nexus Management VRF on same VLAN as LAN switches

1 Hi All. I searched this question but I'm not finding anything relevant, or I'm not understanding the results properly. I have all my L2 switches remote management access, SSH/SFTP, configured on a ...
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0 answers
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Cisco 2960 and Cisco 871 - no connectivity on non-default vlans

Unable to get internet connectivity from non-default vlans. Suspect router config is not adequate Five vlans created on 2960 (10,20,30,40,50)and Gig port 0/1 set to trunk. Port f0 on router which is ...
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0 votes
1 answer
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Configuration of DHCP for multiple vlans

I have the following network on Packet Tracer. The hosts are in different vlans each one. My goal is that the DHCP server can give IP to the hosts. Here is what I made for each vlan (the example is ...
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2 votes
1 answer
92 views

QinQ on EX4200 with arbitrary C-VLAN

Trying to setup an ethernet link from CE located in building A to CE in building B. Customer may or may not tag it's frames sent over the link. Here's the setup I am trying to use +----+ +-------...
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0 votes
1 answer
242 views

How to configure NAT in Cisco ASA Firewall for all VLANs connected to layer 3 switch? [closed]

Topology: How to set up NAT in Cisco ASA Firewall (in Packet Tracer), when there are VLANs in the network? In the current approach, NAT is not working to reach the server (8.8.8.8) from any of the ...
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2 answers
47 views

PowerConnect 5500 Series VLAN routing problem

My issue is very similar to this link: Dell PowerConnect 5524 VLAN routing I have several VLANs But most importantly VLAN 1 is the flat 192.168.69.0/24 VLAN 10 is 192.168.0.0/16 VLAN 110 is 10.1.10.0/...
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1 answer
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Passing Modbus TCP/IP nodes (connected in multiple VLANS, same network) via Toffino firewall

I have been assigned to check the security aspect of the below network shown in image. When i asked question on security of individual modbus device, I was told to create individual vlans for each ...
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2 votes
2 answers
97 views

VLAN enumeration best practice [closed]

I was looking into VLANs recently and noticed that in several tutorials, VLAN tags with large numeric gaps were chosen, like 10, 20, 30, etc. Is there a reason why one wouldn't simply enumerate it ...
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0 votes
2 answers
92 views

Switch with VLAN: How to map between VLANs networks

Assume the following network layout +--------+ ----------------------------------------| Switch |----------------- | ------------------------+-----...
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4 votes
1 answer
227 views

Correct ACL rules to isolate WiFi traffic from other VLANs?

I have written ACL rules written for a Dell PowerConnect 8024F (which, for the most part, uses the Cisco ACL "language") to isolate WiFi traffic from the rest of the network but allow the ...
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  • 143
0 votes
1 answer
38 views

How to force routing to https website without the IP

I am attempting to limit a group of Chromebooks to access one particular site for student testing. The issue is that the website is secure but the ssl cert is attached to the url not the ip. The ip of ...
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0 votes
1 answer
215 views

Configure dhcp relay agent and router on stick

I need help. I don't know what i did wrong because i have configured the dhcp pool, subinterfaces and dhcp relay agent. Gateway pc uses static ip address while Branch pc acquired their ip address ...
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-1 votes
2 answers
237 views

Routing between SVI and routed port on router

How can I achieve reachability from vlan terminated on the L3 switch to routed port on the router, FW? F.E int vlan 10,50 are the SVI's on L3 switch vlan 10 - 10.0.10.254 /24 vlan 50 - 10.0.50.254 /24 ...
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1 vote
2 answers
197 views

Can anyone please explain L3 SVI configuration ,What is SVI and Where do we use it?

I am learning about switching and came across SVI in vlans ,I Googled and watched couple videos and got really confusing Firsly where do we use Svi? and why do we use it,How to configure svi and what ...
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How do I load VLAN database between switches (CISCO 2960)?

I glad for any help on this topic -- netanel
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8 votes
1 answer
1k views

What was the intended use for VLANs 1002, 1003, 1004, 1005? (fddi trcrf fddinet trbrf)

The output of show vlan brief includes VLANs 1002 - 1005: 1002 fddi-default active 1003 trcrf-default active 1004 fddinet-default active ...
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1 vote
1 answer
341 views

Layer 2 (switch) QoS in a LAN or VLAN-based QoS

In my setup above (Cisco 2960 running IOS15), I have all devices marked in red in vlan 20 (WLAN_VLAN), devices in green in VLAN 10 (PC_VLAN) and devices in yellow which are VoIP in the voice vlan. I ...
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1 vote
0 answers
41 views

VLAN for VoIP alone [closed]

In the topology above, I want to create a single VLAN which houses the router and the VoIP phones alone. All other devices should be excluded from this VLAN. I don’t want to use voice VLAN, just ...
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1 vote
0 answers
16 views

Can VLANs be used to prevent vertical communication or is there a better option? [closed]

I've been testing a switch with VLAN features. I have nothing configured on the router for VLANs because it does not support it. I got it set up and was testing isolation between endpoints using ping. ...
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3 votes
4 answers
262 views

How to add two VLANs for DHCP Pool

Currently one of my customer has DHCP pool created in Cisco Switch and ip address range is 192.168.25.0/24 (This is a VLAN). Now they have 230 devices and They are going to increase device count by ...
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0 votes
0 answers
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bad mask for ip adrress error [duplicate]

I'm not too clear on subnetting rules and experienced an error when I tried to assign 192.168.0.7/29 to an interface on my Cisco router. Can someone please explain why it was not allowing me to assign ...
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1 vote
0 answers
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ACL dont work - MASTER VLAN to see ALL OTHERS BUT NOT VICE VERSA [closed]

I am having a bunch of VLANS that are in our HQ. Idea is that only several subnet must see IT department VLAN and all others DONT but IT department must see all vlans. I tried like this, to make all ...
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