Questions tagged [switching]

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

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2
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2answers
92 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 ...
2
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1answer
63 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 ...
2
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1answer
39 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 <----...
2
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1answer
66 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
8 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
18 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
36 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 ...
2
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1answer
66 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 ...
1
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1answer
44 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 ...
5
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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 ...
1
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1answer
98 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 ...
0
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1answer
33 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
472 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
85 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 ...
1
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1answer
47 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 ...
0
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2answers
115 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 ...
0
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1answer
39 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
86 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 ...
1
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1answer
54 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 ...
0
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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 ...
0
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3answers
69 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 ...
1
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1answer
84 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
100 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 ...
0
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1answer
34 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
84 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
158 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 ...
2
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0answers
66 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 ...
0
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1answer
90 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?
1
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1answer
143 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
80 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
50 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?
0
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2answers
45 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 ...
1
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1answer
361 views

What exactly is fragment free switching?

Most commonly refered to as a compromise between store-and-forward and cut-through switching, this method involves storing the first 64 bytes of the ethernet frame in a buffer and then forwarding it. ...
3
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3answers
237 views

How to add multiple ip address in destination ip in acl rule

Iam trying to block a certain host from sending any message to any host in the network is there is a way to do that or i have to deny host by host ?
0
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1answer
22 views

Which path will frames prefer in this setup? [closed]

So I recently installed a long rj45 cable to replace the powerline adapter I was using. I'm keeping the PLA in place as a failover but wanted to know if I will need to swap the connection by hand to ...
1
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1answer
79 views

How to do port mirroring in Juniper EX2200 switch

I am using Juniper EX2200 switch, one of the connected System generating lot of unwanted traffic ( varying from 10 Mb to 25 Mb upload traffic). I wanted to analyse those traffic using port mirroring ...
0
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0answers
32 views

Loop-prevention measures on BGP-signalled VPLS

I have a project to configure a BGP-signalled VPLS overlay for an MPLS network. I will multihome the VPLS to a switching fabric via 2 PEs for redundancy. I understand that VPLS split-horizon behavior ...
1
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2answers
98 views

Cisco 3750X Switch stack best practices

I have a stack of 5 Cisco 3750Xs. I am debating between taking all my servers and putting them on one of the 5 switches, or distributing them over the first few ports of all 5 switches? All of the ...
4
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1answer
196 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
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1answer
91 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
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1answer
27 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
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1answer
570 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 ...
1
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1answer
231 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 ...
3
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1answer
852 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 ...
0
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1answer
34 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 ...
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1answer
47 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?
4
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3answers
214 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 ...
4
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1answer
655 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 ...