Questions tagged [switching]
For questions related to traffic switching and troubleshooting the traffic switching process.
364
questions
2
votes
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
votes
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
votes
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
votes
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 ...
0
votes
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
0
votes
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 ...
0
votes
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
votes
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
vote
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
votes
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
vote
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
votes
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, ...
3
votes
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 ...
1
vote
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
vote
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
votes
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
votes
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
...
1
vote
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
vote
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
votes
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 ...
0
votes
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
votes
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
vote
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(...
0
votes
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
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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
votes
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
votes
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
vote
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 ...
0
votes
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
2
votes
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
votes
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
vote
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
votes
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
votes
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
vote
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
votes
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
vote
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
votes
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
votes
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
vote
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
votes
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
vote
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
votes
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
votes
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 ...
-1
votes
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
votes
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
votes
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 ...
