Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [switching]

For questions related to traffic switching and troubleshooting the traffic switching process.

4
votes
1answer
55 views

Same Vlan Name / ID on different switches network subnet same or different?

I have several switches (some on same floor and another on other floors) all connected to core layer 3 switches through trunk links. One of the vlan id / name is repeated along the switches. May I ...
0
votes
0answers
20 views

Huawei APs on Alcatel switches? [closed]

I work in Serena Hotel. Here we have a Core switch 9700 on which Huawei Access Controller is connected on Port 2/17. Then we have 2 distribution layer switches 6850 connected on Core switch Port 1/1(...
0
votes
1answer
21 views

Netgear M4300: Is it possible to enable multiple destination ports for mirroring?

I have a Netgear m4300 12x12f. Using the web Console I'm able to use one global port for mirroring traffic from other ports. Is there a way to have different ports mirroring different traffic? I'm ...
1
vote
1answer
23 views

Sending Broadcasting Frames after sending Unicast Frames

Absolute newbie here guys, I was reading the compTIA Network+ guide by Mike Meyers, and a section reads: "The frame propagates down the wire into the central box. The switch sends unicast frames to ...
4
votes
1answer
382 views

Why would a switch ever send an ARP request for a MAC address when it can just wait for the first packet to be received from a device?

I've been reading 'Windows Networking Fundamentals' and in that book it says that a switch can learn what MAC address is associated with a particular port when the connected device makes its first ...
3
votes
1answer
460 views

Difference between Giant Frame and Jumbo Frame

Can someone enlighten me the difference between Giant Frame and Jumbo Frame? From what I hear, Giant frame is a frame with the size greater than 1518 Bytes excluding Preamble, Frame Delimiter and ...
1
vote
1answer
157 views

Flooding vs Unknown Unicast Flooding

Can someone clarify what is the difference between Flooding and Unknown Unicast Flooding? Is it the same thing or it contains different meaning? I'm aware that Flooding happens when a switch ...
0
votes
1answer
25 views

localhost vs local IP address: traffic flow [closed]

Let's say I have a server with IP address 192.168.0.1 that is running a network service (I don't think it is important what kind - let's say a webserver on port 80). If I am on the server itself and ...
4
votes
3answers
154 views

Inter-VLAN Routing Issue

As you can see in below diagram regarding the Inter-VLAN between Server (VLAN 107) with The site in (VLAN 104)actually, we can ping all the inter-VLAN on the site. but we cannot browse some of them ...
2
votes
2answers
76 views

Cellular signal handoff

In a cellular network like T-Mobile, Sprint, etc. if one sector of a tri-sector tower is maxed out and can't accept new calls, will a new call request normally served in that sector be handed off to ...
2
votes
1answer
182 views

Configuring multiple subnets with switch connected to single router interface

I have a design like this But I'm receiving a lot of mismatch errors and it doesn't work at all. I tried to ping 10.0.0.1 to no avail. I'm trying to configure the vlans on the switch 1 this way (...
5
votes
2answers
3k views

Does a switch MAC address table sync across all switches in the same VLAN?

Ok, I have read up about this 16K limit for the MAC address table, or better known as the CAM table, on certain switches. Lets say I have 14 different edge switches with that 16K limit, and I have ...
-1
votes
1answer
40 views

Mac Address Flapping and switches

Is mac address flapping the reason why switches don't exchange switching information just like routers exchange routing information?
0
votes
2answers
268 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 ...
4
votes
3answers
283 views

Is there any reason to use a hub over a switch?

Given that hubs are essentially the same as switches, as far as I know, except they share bandwidth between all connected devices, while switches do not, resulting in faster connections. I am simply ...
2
votes
1answer
69 views

Is FDM and TDM only used in circuit switched networks?

I get the idea that TDM and FDM can be used in circuit switched networks, but what about packet switch ones? Can FDM be used?
0
votes
0answers
18 views

DTP On Trunk Ports [duplicate]

When Statically Configuring a Port As Access, DTP Will Be Automatically Disabled. So Why Is It When Statically Configuring a Port As Trunk, DTP Will Still Be Enabled?
0
votes
0answers
33 views

Is it possible to use FDM and TDM at the same time?

I'm learning about FDM and TDM. And I got the idea that we can use frequency division and time division at the same time, i.e. using TDM for each frequency band. Is it possible? It seems certainly ...
5
votes
1answer
607 views

MAC Address learning process

Does a switch learns hosts mac address in these following scenarios: Switch port configured as access and frames received tagged on different VLAN Switch port configured as trunk and frames received ...
0
votes
1answer
57 views

Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems?

Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems? Please, refer to the attached drawing. What are the equivalent Cisco Switches ...
0
votes
0answers
29 views

Spanning tree priority values on port-channel

Group Port-channel Protocol Ports ------------------------------------------------------------------------- 1 Po1(U) LACP Gi0/3(P),Gi0/9(P) 4 Po4(U) LACP ...
2
votes
2answers
259 views

Spanning tree Priority values

show spanning-tree interface gigabitethernet 0/2 Switch default Instance Role State Cost Prio type -------- ---- ----- ---- ---- ---- MST00 ...
0
votes
2answers
38 views

Confused between packet switching and circuit switching

I am a bit confused between packet switching and circuit switching usage in telephones. If there is a loss of packet in packet switching or the packets may arrive in different order why is it still ...
0
votes
1answer
36 views

Tracking the packet flow thru a LAN

We are using a private 10.0.0.0/8 network for the management and other local traffic (storage) in our LAN as shown in the symbolic layout here: 10.0.0.1 10.0.0.2 Gateway ...
4
votes
1answer
125 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'...
4
votes
2answers
275 views

Network Redundancy with LACP Trunking

I would like to set up a redundant link between two switches. I have four ports available to accomplish this. Scenario A: Switch 1 has ports 1+2 trunked together via LACP. They are plugged into ...
3
votes
2answers
2k views

Cisco: err-disabled due to loop - but there are NO redundant physical paths/ wires/ connections

for the third or fourth time in approx two years we have (painfully) noticed some really strange (at least to us) behaviour in our datacenters: Uplink-interfaces on access-switches which have only ...
-5
votes
4answers
706 views

IP Address and Layer 2

As per my Knowledge MAC address is required to communicate two machines...and on layer 2 (Switch) can't understand IP (if i am right)....suppose we have 2 systems (Sys1 and Sys2) with 2 different IP ...
2
votes
1answer
10k views

Why can't devices in different subnets talk with each other?

I know that the layer 2 doesn't understand IP, and the broadcast domain is same. Why can't devices talk, how does it happen?
2
votes
1answer
163 views

Proper network design for office use

I have two 4G LTE router modems in my office which we want our clients connect to these modems to have access to the internet. I have a shared server which should connect to these both modems that ...
6
votes
3answers
229 views

Learning switches and routers

I'm taking a computer networking course and i struggle to get to flow of things when it comes to learning switches and routers. Lets say we have a AS with LANs that connected with switches, and there ...
5
votes
1answer
624 views

Router benefits in 2018 compared to a L3 Switch

What are the benefits nowadays to use a Router instead of a L3 Switch ?
6
votes
2answers
658 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 ...
1
vote
1answer
116 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 ...
2
votes
1answer
416 views

Network design questions

I've been handed a project, and I'm familiar but not experienced enough to make a solid decision on this. I'm actually on the firewall side of things. We've lost our lead engineer and I'm wondering if ...
1
vote
2answers
8k views

How IP helper address works?

How IP helper address works and what is the difference between dhcp and IP helper-address .please explain in brief.
1
vote
2answers
375 views

Why I can ping these subnets from a different subnet?

I wonder why I can ping 192.168.3.50 /27 and 192.168.3.70 /27 from 192.168.3.100 /24. Is is not supposed to be impossible? Thanks in advance for your help.
2
votes
1answer
81 views

PVST with VLANs not matching on switches

How will PVST behave in a situation in which there are two switches connected to each other via access switchports which have different VLANs assigned to them? Ex: [Switch 1] Port with "Access Vlan ...
5
votes
3answers
1k views

Extending VLANs to other switches

I am working in an inherited environment where I have basically been thrown in feet first. I'm also brand new to VLANs, and only set it up via documentation from other techs in my company. After ...
8
votes
2answers
101 views

Will STP lose data whilst switching from a failed link?

In a network with a dual-redundant link between two switches, will any data be lost during the switchover from an active link to the blocked link when the active link fails?
2
votes
1answer
128 views

VLAN Trunking Protocol

Is VLAN Trunking Protocol enabled or disabled by default on all switches ? I have VTP Domain name showing nothing in command "" show VTP status "" therfore does this mean VTP is disabled by default ...
1
vote
1answer
192 views

DTP mode desirable and on

the on mode still negotiable (send/receive DTP) until i set it no negotiate so what is the Difference between on and Desirable. please give an example :))
1
vote
2answers
1k views

Switching vs Routing

I have seen quite a few discussions regarding MPLS stating things like: MPLS combines the performance and capabilities of Layer 2 (data link layer) switching with the proven scalability of Layer 3 (...
3
votes
3answers
1k views

Switching methods (CEF, hardware, software, TCAM table)

Currently studying the switching methods, someone could confirm to me the assumptions as follows ? I also would have some questions. Generally the layer-2 switches have ASIC components with CAM ...
6
votes
1answer
1k views

Which switch MAC addresses are used for the Bridge ID in STP?

Lets imagine that I have big LAN environment with many switches and many VLANs, for example, VLANs 5,15 and 50. I have PVST+ activated, and all of my switches have same (STP) priority. I connect a ...
1
vote
1answer
64 views

Networking Questions (Routing and Switching)

I inherited a haphazard network that I'm in the process of cleaning up and modernizing. Here is a synopsis of the current issue: We have a MySQL DB hosted on a Windows 7 PC (solely used to host the ...
2
votes
1answer
55 views

Routing and Switching & network monitoring

hi i am facing problem in juniper switch Model: ex4200-48t ,Junos: 15.1R6.7 . i deploy network monitoring check-MK software. there is showing errors of juniper switch ports and also show in logs file ...
2
votes
1answer
41 views

Two channels between two switches

Is there a way to provide two physically diverse channels between two switches? I'm using two Cisco Catalysis 3560s, and I want to have two separate channels between them, with different access ...
3
votes
1answer
51 views

Cascading a switch interface to another switch

We have a service provider switch which has an interface that we use to connect to other users over. We have been advised by the SP that we can use this interface how we wish (i.e. feed it into a ...
3
votes
2answers
282 views

How does the switch analyse the EtherType field in Ethernet frame?

What exactly happens when switch receives the frame with given EtherType? Does it analyze it at all or only looks if the TPID is present?