Questions tagged [switching]

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

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30 views

Best Practices with good Home Router and Business Switch. And comparison [closed]

experts I want to make things clear as my networking knowledge is very limited. I have a quad-core home router, TP-Link C4000. And I also have Cisco SG350 layer 3 managed switch, a business class ...
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1answer
50 views

How do computers send switches packets, if switches don't have IP or MAC addresses?

I am new to networking, so please excuse me if I am saying stupid stuff. From my understanding, PCs are sending packets to switches, which then decide which physical port to forward that packet to. ...
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1answer
29 views

I Cannot Ping Switch to Device, but can ping Device to Device

I'm currently troubleshooting a network i built and I'm having an issue with ping connectivity, i have set up DHCP and DNS and my end devices can get IP's from DHCP as well as i have intervlan ...
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1answer
66 views

Switch doesn't learn MAC of a connected device

I am new to networks. What does it mean when a switch doesn't learn the MAC address of the connected device? And how can VLANs can impact that?
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2answers
21 views

How could the line rate of T1 be 1.544 Mbps?

T1 signal is the output of a 24-to-1 digital multiplexer whose inputs are 64 kbps each (plus one framing bit). But a multiplexer is simply an electronic device that selects between several inputs and ...
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2answers
45 views

Switch Operation Beyond VLAN Segmentation

What are the other operations performed by a switch which are outside the VLAN's boundaries. Is Logical (VLAN) Segregation is exactly same as breaking a switching network physically via a Router?
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3answers
36 views

Can a switch be used for either circuit- or packet- switching?

If my understanding is correct, circuit- or packet- switching does not happen inside the switch -- it happens on the network. It is a characteristic of a network and not of a switch. The difference on ...
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0answers
14 views

Since packets holds next hop MAC address, how does a switch knows to which port to send a packet to a destination? [duplicate]

Lets say a switch has 4 ports : P1, P2, P3, P4 Host A is connected to P1 Host B is connected to P4 If Host A wants to send a packet to Host B, the packet will have as destination address the MAC ...
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4answers
931 views

Will IP cameras increase the traffic in our local network?

We need to place 16 IP cameras (4MP) to monitor a warehouse, where all these cameras will be handled by a CCTV. We have 2 options: Connect these cameras through the same cables under the same switch ...
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1answer
33 views

Why does HPE disable STP by default? [closed]

It this certainly true that switches needs STP to avoid loops or broadcasts storms, but recently I saw the configuration of my Hewlett Packard switch and I noticed that it has STP feature disabled by ...
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2answers
64 views

VLAN based subnets, where should I untag a VLAN?

I have attempted to search this problem but I don't really know how to explain it properly (possibly a sign I've taken on more project than I can handle). Anyway I am currently working on chopping ...
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2answers
114 views

Whats the difference between VOICE VLAN and ACCESS VLAN

Can someone please tell me the difference in Layman's termsfor these 2 configurations? interface FastEthernet0/1 description PHONES switchport mode access **switchport voice vlan 51** spanning-...
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1answer
44 views

OSPF neighbor not working

I'm currently designing a spine leaf network, 2 Spine switches and 4 leaf switches. btw this in packet tracer. So in order its Spine1# and Spine2#, then Leaf1#, Leaf2#, Leaf3#, Leaf4#, and addresses ...
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1answer
62 views

Why can't get host's mac address on l2 switch through snmp? But can get it on l3 router

I am trying to get computer's mac address through snmp. I have an envirmont in GNS3: l3 R1's image is vios-adventerprisek9-m.SPA.157-3.M3 l2 SW1's image is viosl2-adventerprisek9-m.SSA....
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45 views

when to disable CEF on an interface

i am currently learning about CEF and i came across the command "no ip route-cache cef", which i do understand what it does, essentially, it enables Fast-switching/process switching on an interface. ...
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1answer
35 views

How does the swtich know if a packet needs layer 2 switching or layer 3 routing?

I have a network topoloty as follows A --------- B --------- C /|\ /|\ /|\ / | \ / | \ / | \ A1 A2 A3 B1 B2 B3 C1 C2 C3 A, B, C are ...
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2answers
116 views

Can a single subnet work across several switches?

New to networking and studying hard but limited access to a kit to try things at the moment... My question is - if I had, for example, two Layer-2 switches cable connected, could I have devices on ...
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1answer
72 views

How does a switch port connect to any other port?

According to Data Communications and Networking by Behrouz Forouzan, a packet switch has four components: input ports, output ports, routing processor, and switching fabric. The basic architecture ...
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1answer
59 views

Query on PTP Transparent Clock

I had a query in PTP Transparent Clock(TC), Please consider the below picture for my question. I will try to express my question with the help of a real world example Say, two places Place_A <----...
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1answer
70 views

ICMP message doesn't leave NIC of PC

I got an interVLAN configuration a.k.a 'Router on a Stick'. I can ping all the workstations with each other, except PC9 (refer to image). I did a simulation and found that the packet does not even ...
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0answers
10 views

Finding device using Avaya Configuration and Orchestration Manager

Is it possible to search for a specific device using either it's IP or MAC address using Avaya Configuration and Orchestration Manager
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0answers
23 views

Cisco Virl instace issue

i'm using cisco virl on dcloud and when i try to run my topology consisting of 2 ios routers and an iosl2 router i get an error... stating that i've exceeded quotas, required 4, available 0. Any ...
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2answers
39 views

Why doesn't kernel itself had entire L2/L3 protocol stack? [closed]

I know kernel itself handles protocols in layer 2, layer3 and layer 4 at ipv4 stack, but why can't kernel itself doesn't have protocols such as STP/RSTP/xSTP/OSPF...etc, implemented. Why should we ...
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1answer
166 views

What is the purpose of native VLAN on a trunk link?

Most VLAN articles I've read recommend avoid using VLAN1 for ports with untagged traffic (aka access ports). I've heard enough of this nonsense. Except for the reserved values of 0x000 and 0xFFF, a ...
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1answer
47 views

IP Routing and Switching Interface Speeds

I have a question that relates to routing and switches. I am looking to set up a new Firewall that will handle the routing for the network and attached to the Firewall will be a switch. Here are the ...
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6answers
3k views

packet routing between subnets on same vlan

I am trying to understand how packets are routed within the same VLAN. I understand that typically there should be a 1:1 mapping between VLANs and Subnets. However if i deploy the following ...
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1answer
103 views

Why Do We Use STP (Spanning Tree Protocol) or RSTP (Rapid Spanning Tree Protocol) When Packets are Not Routed Optimally?

I am new to networking so this probably a naive question. I've been reading up on the spanning tree protocol and understand why it's necessary in a network (it prevents loops) and I understand that ...
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1answer
35 views

Unicast Adjacency Routes Nexus (AM) Cisco Nexus

I have an odd situation. There is static route on my Nexus 7700 that routes anything for specific subnet /24 to a F5 LTM Load Balancer, external VRRP interface 10.x.153.15. As you can see below, ...
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3answers
515 views

LACPDU packets to pass through unmanaged switch

I have two buildings connected through the CAT6 cable and both ends have cisco-sg350 (capable of etherchannel). Due to the limitations of the cable both the switches are connected through a unmanaged ...
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2answers
143 views

Clock Synchronization in a Network

I had a query in Clock Synchronization in a LAN.. If we already have clock synchronization in a network with the help of preamble field in an Ethernet frame. Why should we need still protocols such ...
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1answer
54 views

Port mirroring question

I've got some questions about my port mirroring configuration. I'm working with alcatel omniswitch. After configuring port mirroring my destination port is loosing network connection and it can't ...
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2answers
167 views

How can i find which cisco switch port is connnected to specific port of Fortigate?

there is any way to find that which switch port connected to mgmt port of fortigate? for example can i enable lldp on Cisco switch and Fortigate together? Fortigate 1500D (version 5.6.2) and switch is ...
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1answer
54 views

STP Shut Down Port for Camera on HP Procurve

I have a VLAN dedicated for camera devices. We have learned that some camera ports keep going into the down state, and the logging indicates it is caused by STP: sw404(config)# show logging -r 7 ...
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2answers
90 views

Cisco Catalyst 9410 - Using Default Gateway versus ARPing for locally connected host

I may be missing something extremely simple here, but im at loss trying to figure out what this Nexus switch is doing. Here is the topology: DISCLAIMER! I had made a mistake on the diagram by ...
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1answer
61 views

Can different VLANs have same subnet? [duplicate]

When talking about VLANs I often see examples like this: VLAN 10 - 10.0.10.0/24 VLAN 20 - 10.0.20.0/24 Different subnets yet different VLANs. I understand this is a must if we want communication ...
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1answer
43 views

Setting all switchports as tagged for 200 x VLANs?

question: should I expect any performance hit from enabling 210x tagged VLANs on ALL 24x ports of a switch (or alternatively setting ALL 24x ports as trunk ports) background / equipment: We have a ...
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2answers
41 views

Is datagram switching only possible with routers?

So datagram switching is when packets from same original message travel different paths from source to destination. This cannot happen with switches because switches would just run STP thus ...
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3answers
73 views

Bridges, hubs, switches and repeaters in subnetting

I'm learning to subnet and I'm constantly doing exercises on paper about this topic. I'm trying to breakdown a network into smaller subnets, given the number of hosts for each one. For now, I only ...
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1answer
85 views

dhcp client not receving the ip address using two switches

1) In Router 4(R4) i have configured the 2 dhcp pool. first dhcp pool with ip address 150.10.10.0/24 and second one with 150.20.10.1/24 in subinterfaces f0/0.1 and f0/0.2 and encapsulated using (R4(...
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2answers
125 views

How is Ethernet a packet-switched network?

Let's say for example there is an Ethernet switch, and there are four PCs connected to this switch. PC1 and PC2 are communicating with each other, and at the same time PC3 and PC4 are also ...
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1answer
40 views

I have a small managed switch I want to use as the default gateway for my subnet, but something isn't working

Not a networking guy by trade, but I know enough to get myself into some trouble. And I think I've managed it. I need to set up a DHCP server on a PC for a small subnet of 3 or 4 devices. I have ...
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3answers
89 views

Regarding Cisco's hierarchical network design

why routed ports usually implemented between the distribution layer and the core layer ? why not just extend the layer 2 domain to the core layer ? is the other design model more practical than this ...
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1answer
25 views

Broadcast Timer [duplicate]

This question is regarding in the process of L2 MAC Address learning. As we know, if a sender sends a packet to some receiver host which switch doesn't know, it will broadcast for learning. Assume an ...
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3answers
258 views

Do routers understand transport protocol?

We are taught about the difference between hubs, switches, and routers. A hub is a layer 1 device, it only knows layer 1 and doesn't care about layer 2 and above. Similarly, a switch is a layer 2 ...
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0answers
87 views

C2960 - Memory has insufficient capacity [closed]

Please, do you know if there is any way on how to release more processor memory from a C2960 switch without restarting it? I am receiving an insufficient memory alarm from this switch. I noticed that ...
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1answer
104 views

Will this network diagram cause broadcast storms?

I have three VLANs, and I want to communicate between them, but all packets are dropped. I made a trunk to allow all VLANs. Should I use STP to control broadcast storms?
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1answer
201 views

Help with VLANs on Meraki MX

I have a Meraki MX84 in Routed mode with a Default 10.10.0.0/24 subnet and then VLAN 10.10.3.0/24 ID 3, VLAN 10.10.4.0/24 ID 4, VLAN 10.10.5.0/24 ID 5, and 10.10.8.0/24 with ID 8. All ports on it are ...
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2answers
82 views

Is Spanning Tree Protocol Needed?

If there are two switches connected directly together with two links is spanning tree protocol needed? please see below snippet
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1answer
55 views

What's the LAG interface period be if the two switches have different periods set

Considering a LAG interface between two devices A and B, A is configured to have LACP fast transmission and B to be LACP slow what would be the resulting aggregate interface's period be?
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2answers
46 views

Switch Ethernet Port Groups

I am setting up a motion capture system (vicon vantage), and the cameras are PoE, and all plug into a switch (DGS‑1026MP, 26 Port Gigabit Max PoE Switch) to feed a PC. The instructions say to not ...

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