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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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2answers
20 views

OpenvSwitch Spanning-tree priority for specific Vlan ID

I'm new to the SDN technology, I have 12 year's experience working with Cisco products, On Cisco devices, a user can set different STP priority Per VLAN ID Like : Switch(config)#spanning-tree VLAN ...
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0answers
11 views

DHCP server alert. No addresses are available from server scopes [on hold]

My 2012 r2 dhcp server states it has exhausted all IPs in the scope. So it is not able to lease or service clients. instead it starting to delete reservation. I know for sure Ips are available in ...
4
votes
1answer
223 views

Whether the Vlan10 and Vlan20 in the Center Router are two virtual router interfaces?

I have a ISP 4321 Router in my Cisco Packet Tracer. and I added a NIM-ES2-4 module in the Router, that provides four switching ports. and now, I configured two VLANs to the two switch port of them. ...
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2answers
249 views

Is Subnetting the Way to Configure this Network?

I have roughly 20 devices connected to a switch and want to divide them up by their different functions. Some devices are sensors, some are motor controllers, there's a data-logger, and a PC to ...
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0answers
11 views

Trying to get VLANs working between Mikrotik HAP AC and RB4011iGS+ [on hold]

Here is the network diagram: https://i.imgur.com/sQFvmZj.png From PC1 (192.168.9.253) I cannot ping vlan gateway 192.168.9.1 on RB4011iGS+ and vlan ip 192.168.9.2 on HAP AC. Also, all three of these ...
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0answers
15 views

Making APs from different networks accessible to one of the networks on Mikrotik [on hold]

I have four VLANs set up on my Mikrotik router: VLAN100 - 192.168.0.0/24 VLAN200 - 192.168.1.0/24 VLAN300 - 192.168.2.0/24 VLAN400 - 192.168.3.0/24 All traffic between these ...
2
votes
1answer
24 views

Connect two VLANs on an NE1032 Lenovo L3 Switch

I just got a new Lenovo ThinkSwitch NE1032 with some 1G sfp. I have already created two VLANs called FE and BE that have the following IDs: 2,3. I have managed to assign an IP subnet to both of them, ...
6
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2answers
515 views

Posible to connect VLAN switch through dumb switch?

Is it possible to connect a VLAN switch into a dumb switch ? The router will know how to reach network connected by a VLAN through the dumb switch please ? No edge effect ? By example, a schema of ...
0
votes
1answer
61 views

How VLAN devices will get automatically IP from DHCP server

I have one Windows server 2012R2 which has 10.219.1.1 IP address & I also have Cisco Catalyst 2960-X Series which is layer 2, we managed to do inter VLAN routing by updating its firmware, where we ...
0
votes
1answer
19 views

Confused about switch configuration with 2 VLANs, and next hop route?

I have an Arista switch I'm trying to setup for learning. The router is a Netgate SG-3100 running pfSense 2.4.5. I have two VLANs setup: VLAN 22 - for normal browsing. Using the 10.0.22.0/24 subnet ...
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2answers
26 views

Use of VLAN allowed feature and security risk associated with not configuring it

if i have 3 vlans say, 10,20 ,30 if i don't assign vlan allowed to trunk port , what are the security risks i could face if i am using default vlan allowed range what are the benefits of VLAN ...
3
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2answers
42 views

Does 802.1Q protocol will remove the VLAN tag in the received place?

Does 802.1Q protocol will remove the VLAN tag in the received place? Such as the VLAN 10 trough 802.1Q protocol to pass frames. the 802.1Q will add 802.1q header(tag) and recalculate CRC/FCS like ...
0
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3answers
35 views

Two ports both in VLAN 1 on two separate switches down/down

For someone who recently got their CCENT, I feel kind of stumped. I have two switches, both are Cisco 3550s. I am using VLAN 1 as a management vlan and on S1, I assigned IP address 10.24.0.11/24 to ...
-1
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1answer
24 views

Why does the HP Procurve show MAC addresses as 64bit and what do the first 16bits represent?

I'm working on an HP ProCurve 1810G running software P1.17. When I look at the MAC address table, it shows the learned MACs as 64bit addresses. Closer examination shows that the last 6 octets are the ...
2
votes
1answer
36 views

Standard access list

I have following setup Vlan10 Pc1 192.168.10.20 Vlan20 Pc2 192.168.20.20 Vlan21 Pc2 192.168.21.20 Subnet :255.255.255.0 All connected to layer 3 switch I have ...
1
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0answers
25 views

Network segmentation with VLAN and MAC auth: thoughts about implementation

Currently we have a medium-sized, flat network with some DHCP pools. This configuration isn't satisfying us anymore, as everyone can see everything on the network and it may leads to security issues. ...
0
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3answers
40 views

How does a switch differentiate VLANs internally? [closed]

In a simple topology of a single switch with two Access ports configured, for example fa0/1 on VLAN 10 and fa0/2 on VLAN 20, how does a switch know not to send broadcasts between these vlans if they ...
2
votes
2answers
36 views

Question about Configuring HP 2920

I'm trying to configure an HP 2920 to do routing between VLANs. I'm working on setting up a guest wireless network and I want to prevent clients on the guest VLAN from accessing our main VLAN. ...
2
votes
0answers
34 views

VLANs still exist on my switch as I reset it [closed]

I reset my Cisco 3750 by write erase and then del the vlan.dat file from the flash and reload it... but sh VTP status is still showing the VLAN... why are the VLANs still there after I deleted the ...
2
votes
1answer
42 views

Issue with ACL and router on a stick network

I have implemented LAN design in packet tracer with 6 VLANS using router on a stick configuration. Everything seems to work without ACL but I'm trying to implement rules where only the 02nd floor ...
2
votes
2answers
83 views

Cisco Catalyst 3850 router VLAN bridge no routing

New to Cisco stuff so bear with me (only a little L2 Procurve experience). I have a development network connected to an Aruba/HPE managed switch feeding a trunk with tagged VLAN's to an internal ...
0
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2answers
46 views

Inter vlan routing not working

Apologies if any details not clear as I'm not a network expert. I have a Procurve 3500yl layer-3 switch. I am trying to make two VLANs and get a PC in one VLAN to connect to the other VLAN. Below is ...
0
votes
1answer
43 views

Single DHCP server for multiple VLANs (packet tracer)

I have a layer 2 switch, PC 1 connected to port 1 and PC 2 connected to port 2. Port 1 is in VLAN 20 Port 2 is in VLAN 21 Can I use a single DHCP server without a router and give IP to both the PCs?...
1
vote
1answer
33 views

How to configure DHCP pools for 2 VLANs/subnets sharing a switch

I've set up DHCP pools on a layer 3 switch that goes out to 13 layer 2 switches. Most of which have their own subnet and VLANs, and everything works fine when that's the case. But when there are two ...
1
vote
0answers
41 views

What are the differences between network slicing and VLANs?

According to Ericsson, network slicing is defined as follows: Network slicing enables you to build multiple logical networks—network slices—on top of a common shared physical infrastructure. These ...
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0answers
17 views

Need an Access Port and an Etherchannel between two switches

I have an access port and a port aggregation (LACP of 4 trunks) between two switches. The switches are both Cisco Catalyst 3560. I need traffic from a certain class (vlan 2) to never use the ...
7
votes
1answer
113 views

NAT VLANs with same IP Subnets

I have a VMware environment in which VMs are running a simulation suite. The software used has hardcoded IP addresses, about 10-15 VMs, and we are running multiple instances of this software each in ...
0
votes
1answer
39 views

Vlaning issue Cisco 3560 Switch

I'm trying to connect a door intercom to fastethernet 0/1 and then 8 users connect to fe 0/2-fe 0/9 and give each user access to the first port (0/1) without letting them access each other. I have ...
0
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0answers
24 views

Isolate 2 devices in specific VLAN connected to the switch from other devices in the same switch with the same VLAN

I need to isolate 2 devices in specific VLAN 11 which are connected to the switch from other devices which are connected to the same switch with the same VLAN 11. You can see network schema on ...
2
votes
1answer
44 views

Managed switch uplink without “no switchport”

Say you have a L3 switch routing between VLANs 10, 20, and 30, and you need to uplink the switch to a router for the VLANs to get to the rest of the network. The VLANs don't traverse between sites. I ...
0
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0answers
25 views

EIGRP not showing in Routing Table on Router

I've got 2 layer 3 switches connected to a router using EIGRP as a routing protocol. The switches can see each other's network in the routing table, however EIGRP is not shown in the router's routing ...
0
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0answers
73 views

Intra-VLAN communication between wired and wireless devices

I am trying to get a very simple VLAN with WIFI network experiment up. I have been searching online (including on this site) for sometime hoping to find an experiment similar to mine. However, most ...
0
votes
1answer
64 views

Vlan cannot get DHCP address from using Router and L3 Switch

Simplified diagram of a larger network, but I'm having trouble getting DHCP from the router. Going into simulation mode in packet tracer, I'm seeing an error on the layer 3 switch saying "There is no ...
0
votes
1answer
36 views

Newby setting up a small business with an IP Credit card machine [closed]

I have a small network with a shared internet connection. I have a router separating my network and everything into an unmanaged switch. The credit card machine security ran a check and said we are ...
0
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2answers
68 views

Can a non-trunking SVI interface be assigned to two VLANs?

As per our network monitoring device, One of the Catalyst 6807 in the network have 2 vlans assigned to SVI interface . I am not sure if this is misconfiguration . I wanted to know if this is ...
3
votes
1answer
67 views

What does 'parent interface' mean with respect to VLANs?

I'm trying to learn about VLANs by configuring a router with PFsense installed. Reading the documentation I came across the following sentence: The following example shows how to configure two ...
0
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2answers
27 views

Joining OOB for network and server equipment [closed]

Say I have some network equipment with management interfaces on a VLAN X. Now say I also have servers with double interfaces: one for production and one for management. Is it considered a good or bad ...
1
vote
5answers
162 views

What is a VLAN (really)?

My question is about the literal and precise meaning of the term "VLAN". According to IEEE 802.1Q-2014, a LAN is a single segment of a medium. A cable connecting a PC to a switch port is a single LAN. ...
0
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0answers
33 views

Juniper MX Bridge C-VLAN to Standard VLAN Translation

So we're starting out as a new ISP running with some Juniper kit. We've established a connection with our local fibre provider, and have a BNG connected to our MX router. From our trunk from our ...
2
votes
0answers
57 views

add VLAN access ports to a VSI (HP)

I'm trying to understand how VLANs work in conjunction with VSI / VPLS. I'm using two HP A5800AF switches connected through MPLS. Specifically, I want to associate a port on each side with a specific ...
0
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2answers
73 views

BGP with x2 sessions and x2 L3 VLANs - Please Explain

I am learning about Cisco BGP networking now and came across an interesting situation. In my examples, there was one which suggested that two VLANs were configured on Layer 3 in order to run two BGP ...
1
vote
1answer
24 views

Where does the VLAN's gateway location

Where is the gateway IP address of the VLAN? We know the Switch can divide the VLAN, such as it can divide the 103.19.1.0/24 to 103.19.1.0/25 and 103.19.1.128/25. if the 103.19.1.0/25's gateway IP ...
0
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2answers
41 views

How to enable communication of devices from different VLANs [closed]

In my router (DSR-1000AC with Firmware 3.11_WW), I created a new VLAN 192.168.3.x following the instructions from HOW to Setup Two VLANS ‑ DSR‑Series. I used a simple switch (not managed) and I ...
0
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1answer
75 views

Cisco 2960 not receiving dhcp from the router

I have a problem with Dhcp of some the Vlans. here is how my network is : I have a router ASR1001, which connects 15 switches(2960) as a ring topology. each switch has a subinterface of the router ...
1
vote
2answers
45 views

Routing specific TCP/UDP packets from VLAN's to proxy server

I need to set up a solution which is for routing specific TCP/UDP packets between the devices in two separate VLANs through a proxy server. For eg: all my computers are connected to one VLAN(1) and my ...
6
votes
3answers
1k views

How not to route on a Cisco router

So we have a router, with a switch card interface, 8 ports Say I have 4 VLANs (A,B,C,D) on it, with 2 switch ports in each. Each VLAN (i.e. all ports) can communicate with each other, because ...
2
votes
1answer
81 views

How to solve a BKN* Port Issue on a cisco catalyst

There is a Cisco ISR 4451 connected with Portchannel to a Catalyst 3850 Stack and there are some VLANs enabled, but only one does not come up for a Portinconsistence. I figure out an Issue on the ...
0
votes
1answer
62 views

Cisco RV325 VPN to Remote Site with Multiple VLANs

We've been running a VPN over two Cisco RV325's successfully using the following mapping: Site1: IPS="NAME=g2gips0&WEBNAME=Site2&LSUBNET=10.10.0.0&LMASK=255.255.255.0&RG_IP=71.XXX.XXX....
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0answers
18 views

802.1Q-2014 I-Tag and MAC addresses

I am reading IEEE 802.1Q-2014 for interest. This incorporates I-Tags, which define backbone service instances. In a few places, the standard implies or states that the I-Tag includes the C-DA and C-SA....
0
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2answers
91 views

Vlan trunk link between cisco switch and BDCom Switch not working, but works in access mode

I have a cisco SF 300 switch which is connected to a chinese brand BDCOM switch (2500 series full gigabit port) . When both the ports of switch are configured in access mode, it works. But when they ...