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.
1,247
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VXLAN VNI VLAN mapping
Is VXLAN tunneling similar to Q-in-Q tunneling (except VxLAN works at Layer 3), such that each customer/tenant gets its own VNI and each VNI can then map to multiple VLANs, so a single VNI can ...
- 113
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32
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Mellanox (NVIDIA) SN3700 switch: Cumulus Linux configuration to force traffic path?
I want to stress all ports on a SN3700 switch with iPerf. I want to force the traffic to go through each port, so port 1 to port 2, port 2 to port 3, port 3 to port 4, etc.
The switch is running ...
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votes
1
answer
45
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Switch ping to router with trunk port
If I have a switch port trunk directly connect to a router with the follow scenario below:
-------- g1/0/1 (Trunk) g1/0/1 |------|
|switch| Native VLAN 1 SVI=...
- 103
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1
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46
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Configuring multiple public IPs in Cisco 881 to forward private IPs with tags while bandwidth balancing [closed]
The ISP is sending four tagged public IPs (VLAN 30) through one WAN cable. Currently, this cable is connected to a switch that recognizes the tag and distributes it appropriately. Naturally, a router ...
- 103
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1
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71
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ASA5555-X vlans through port channel not working
I'm havin a problem with my ASA when trying to pass vlans through port channel to a switch. The goal being here that all vlans that we have would go through a single port channel (4 1Gb links for load ...
1
vote
1
answer
28
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VTP transparent mode Switch does not pass user traffic to and from other VTP Switches
Practicing on Packet Tracer, I have a topology of four switches named Switch-A, B, C and D. connected with one another in straight line
Switch A has two VLANs (Faculty and Students) and is configured ...
- 11
1
vote
1
answer
101
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Access list and interface vlan
Pleasae I am facing this problem, the ping is always successful from 10.16.13.2 to 192.168.0.3
even if Iam configuring the acl in the 'in indirection'.
show ip access-list
Extended IP access list ...
- 41
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1
answer
18
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Connecting a hub to my switch bypasses RADIUS/802.1X
I have set up a windows nps server (radius), it works with eap-tls.
In the switch when the authentication is validated the port is passed in vlan 100 and when it is refused it is passed in vlan 101.
...
- 1
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1
answer
65
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Cannot get my servers on the same broadcast domain as backbone gateway using Aruba switches
My supervisor told me to go to the server room and connect a bunch of servers to the Department network so they are accessible from office PCs. In the server room we have 7 servers, a couple of wall ...
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1
vote
2
answers
84
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Understanding VLAN Tagging for Network Segmentation
I've been reading up on network segmentation and the use of VLANs to enhance security and network management. However, I'm still a bit unclear about the concept of VLAN tagging. Can someone please ...
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79
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I want to set up a MSTP Redundant Network
For the past few days i have been trying to get multiple VLan's working that are redundantly connected. One VLan would be connected through a controller and to the other switch. Then a second cable to ...
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1
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71
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Is this the right way to expose VLANs through VPN (VPN server location)?
Starting from the following network topology:
Internet --- ISP Cable Router --- Firewall --- Router --- rest of the network / multiple VLANs
(port forwarding) |
...
- 101
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0
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36
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IPsec no working properly
I want to set an IPsec between two routers similar to the one in this lab, however the client on router EAST is NATted with the public IP 98.76.65.42
on the local side
EAST(config)# access-list 110 ...
- 3
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2
answers
215
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Unable to ping across different vlans
I have two switches (A,B) connected to each other and one of them is connected to a router with the interfaces
g0/1.1 vlan10
g0/1.2 vlan20
g0/1.99 native
switch A has vlan 10 (10.0.0.0/24)
switch B ...
- 3
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1
answer
46
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Cisco 3650 and wifi hotspot
I have to connect wifi hotspots on cisco catalyst ports of cisco 3650.
The wifi controller is connected on 2 ports, because it delivers 2 wifi vlans (6 and 40).
The hotspots must receive an IP from ...
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1
answer
65
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Layer 3 Switch IP Problem on Packet Tracer
I set up a network. It contains vlans. I assigned devices ip addresses from different subnets. I have 2 layer 3 switches to communicate them. I assigned switches ip addresses from different subnet. I ...
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1
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2
answers
97
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Inter-VLAN using L3 switch
There are 3 VLANs 10, 20 and 30 on these switchs. Everything such as VTP, DTP are working fine. The problem is that inter-VLAN seems not to work correctly. IP routing is activated on the L3SW (even ...
- 27
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1
answer
51
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Non VLAN Tagged Traffic Not Going Through Trunk Between Cisco Switches
Good day all.
I am running through a packet tracer exercise and am stuck on where to go next. Forgive me if I am missing something obvious, I have not touched any cisco networking or networking in ...
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2
answers
39
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Trying to achieve ECHO request reaching destination in other VLAN
I'm working in a network on packet tracer, when I'm sending ICMP requests from VLAN 20 (yellow field) to VLAN 10 (turqoise field) the packets get stuck at the switch where it is connected to.
Case 2: ...
- 3
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2
answers
93
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Can we have two logging source-interface configured on Cisco Switch?
I would like to understand if its possible for us to have two logging source-interface configured on Cisco Switch:
logging source-interface vlan1 (For syslogs)
logging source-interface vlan2 (For ...
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1
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1
answer
331
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Cisco interface vlan (shutdown vs no ip address)
What is the difference in functionality between these two commands.
interface Vlan10
shutdown
interface Vlan10
no ip address
I haven't been able to find any source material, but I've seen other ...
- 113
1
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1
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102
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Give internet access with a not VLAN enabled router to two VLAN networks
I'm a bit of a novice in this area. I currently have two VLAN-capable switches (HP ProCurve 2850 2824) and some switches and routers that are not VLAN-capable, more like consumer-level devices (such ...
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2
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103
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How does L2 switch forward tagged VLAN?
I am a student of networking and have a question. I am currently doing an internship / project at a school where they have 3 buildings. I will name them for now
A (subnet 172.16.x.x) --> Each with ...
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3
answers
112
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If all subnets are a part of same vlan, then the network segregation using subnets does not make sense
This is what we know about subnetting.
By dividing a network into subnets, you can separate different departments, locations, or security zones, creating distinct broadcast domains. This segmentation ...
- 395
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1
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307
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HSRP and DHCP problem
I have 2 layer 3 switches DS1 and DS2. There are the same VLANs but different IP addresses on VLAN interfaces.
On DS1:
VLAN 10: 192.168.10.1/24
VLAN 20: 192.168.20.1/24
On DS2:
VLAN 10: 192.168.10.2/...
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votes
1
answer
58
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Cannot enable link. Why?
I have the following setup:
I'm unable to enable Fa0/5. The switch configuration for that port is correct
No configuration has been made on the server side:
Assigning Ip adresses has not solved the ...
- 305
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votes
1
answer
233
views
Why does this access list block DHCP request?
To prevent IP spoofing in a VLAN I configured the following access list
ip access-list extended MITARBEITER
permit tcp 10.15.240.0 0.0.0.255 any
permit udp 10.15.240.0 0.0.0.255 any
permit icmp 10....
- 305
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1
answer
454
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QinQ does not work with L2VPN (VSI and MPLS L2VC - Switch Huawei)
Currently, I am trying to configure a network to transport multiple VLANs for a client who has points in different locations (Side A and Side B). My idea was to use QinQ for this. The network topology ...
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0
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209
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Cannot tag an interface for a specific VLAN : % Error: Tagged flag mis-match Te 0/3
I trying to tag an interface for a specific VLAN on a Dell S4810 :
S4810#show run int ten 0/3
!
interface TenGigabitEthernet 0/3
no ip address
mtu 12000
switchport
flowcontrol rx on tx on
no ...
- 135
3
votes
2
answers
219
views
ethernet switching table is empty | vQFX | EVE-NG
I'm new to Juniper switches. I configured vlan10 and assigned two ports to the relevant vlan.
root> show vlans
Routing instance VLAN name Tag Interfaces
default-switch vlan10 ...
- 33
1
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0
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101
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Can't Pass 1 VLAN Through Trunk
I have 2 Cisco switches running IOS with VLANS 20,30,40,50. On SWITCH1 I have servers on Ports 1,2&3 on VLAN 30. I also have a laptop on port 5 on the same VLAN 30 and can ping the servers. They ...
- 461
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0
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123
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Use a single FortiSwitch in multiple, segmented networks
Is it possible to use a single switch in multiple, segmented and firewall protected subnets?
Looking at the above picture, I have this existing network WITHOUT the two inner firewalls. The switch is ...
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2
votes
1
answer
33
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Is source source_wildcard-mask necessary when traffic is orginating from a VLAN when access list is applied in direction of the interface (in)
Let's say I have a vlan 1 with domain 192.168.10.0 0.0.0.255...also a vlan 2 with 192.168.20.0. 0.0.0.255..These are connected to router with intervlan enabled. Now I want to implement access list ...
- 305
3
votes
1
answer
93
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Should I be using point-to-point or broadcast if I plan on using SVIs in IS-IS on Juniper?
Apologies in advance if this is super-basic question, still learning ISIS.
I'm migrating from Cisco over to Juniper in an environment where all of the switches are running EIGRP, are on a 172.31.255.0/...
- 33
2
votes
2
answers
78
views
MST - multiple instance design in single region
I am preparing for migration of this rather simple network layout from RST to MST:
From what I have read so far, it looks like the best approach is to avoid interoperability issues and simply rollout ...
- 177
1
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1
answer
60
views
Is non-blocking per-VLAN (rapid) spanning tree configuration possible?
Imagine a pair of switches connected with a couple of trunk links created in the following fashion:
Assuming the numbers on lines correspond to different VLANs, how would you arrange a working ...
- 177
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1
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81
views
Static route is not saved - Why?
I have the following configuration. On R1 I do inter-vlan routing. The problem is when I ping the serial interface of ISP1 with PC MA11 the ping packet is not returned to R1. I wanted to add a static ...
- 305
2
votes
1
answer
203
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How to implement inter-vlan routing in this configuration on L3 switch
I want to enable inter-vlan routing on L3 switch. I have accomplished this by the following commands executed on Gig1/0/16 and Gig1/0/10 and setting the respective (192.168.x.1) as gateway on the ...
- 305
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1
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93
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Tag Control Information Byte Order
I need to extract the 12-bit VLAN ID from the 16-bit TCI section of the 802.1Q tag in an Ethernet frame.
I already have the TCI extracted and stored as a uint16_t.
I know that bytes arrive in Big ...
0
votes
1
answer
144
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How should edge switches have their routing configured (when there is a mgmt vlan in the mix)
I'm having trouble with a new network topology we are trying to implement onto our environment. The issue seems to be with the switches. The problem is not relevant to this question but for ...
- 137
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83
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A newbie question about VLAN
Sorry for asking this. I am not a network engineer, but I do plan my own network, and know a little on how things moved. But I am not familiar on the terms being used.
Now, suppose I have these ...
- 103
1
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2
answers
610
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Exclude a certain vlan/subnet from layer3 inter-vlan routing
We have new gen aruba (hpe) switches in our environment.
There is a backbone (5412R zl2) which all edge switches are connected to. The edge switches are also layer 3 (2930F). The backbone delivers ...
- 137
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0
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47
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Restconf not getting switchport vlan information
I have a couple of catalyst switches which I'm experiencing an interesting issue using APIs not pulling all the information I need.
The switches are running IOS-XE 17.6.3, but I have also seen the ...
- 11
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1
answer
180
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Is it possible to establish communication using just an ethernet cable?
I have two linux systems, server and client, whose both ethernet port has VLAN tagging(preconfigured IP address and same subnet), and connected with a common ethernet cable (no router or network ...
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2
answers
197
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Connecting L3 and L2 switches with VLAN settings
I have 1 L3 switch with
Static ip - 192.168.0.252
Two L2 switches
Switch A - 192.168.0.250
Switch B - 192.168.0.251
I have created VLANs in L3 switches with 192.168.1.1 and 192.168.2.2 ips abd set it ...
- 101
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1
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276
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Cisco Switch vIOS-L2 in GNS3 and CCNA 200-301
I am reading a preparation book for the CCNA Test 200-301. Currently, I am reading a section about DHCP and VLAN interfaces in a switch. The book shows an example of configuring this.
switch# ...
- 103
1
vote
3
answers
225
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Cisco radius auto vlan assignment without ISE
I read in a lot of tutorials that i must have the ISE engine to implement auto vlan assignment using the
authentication event fail retry 3 action authorize vlan 2
command on a cisco switch? Is that ...
- 79
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votes
1
answer
42
views
Private vlan split in two networks
Is it possible to split one private vlan (or isolated vlan) between two networks?
so the "white" vlan from network 1 can only communicate with its peer in network 2?
0
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1
answer
109
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SPAN/RSPAN monitoring VLAN vs Interface
I am a little lost with regards to the concept of capturing every traffic passing a core switch. If we set our monitor source to be all VLANs in a L3 switch, does that mean that traffic coming from a ...
- 3
5
votes
2
answers
1k
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Stretching VLANS across a network infrastructure
I am learning about Autonomous and Lightweight APs at the moment and I came across this slide from a course that I follow.
This specific line
I know that this problem can be solved by using ...
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