Questions tagged [switch]

For questions about network switches, the term commonly refers to a multi-port network bridge that processes and routes data at the data link layer (layer 2) of the OSI model.

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14 views

Assigning Static IP to the servers connected with router through switch [closed]

I am looking out a way to assign static IP to the servers which are connected to a 16 port switch with router at the beginning. Here is the how the architecture looks like I have got /28 IP pool from ...
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1answer
45 views

How can i make every network on this topology speak together?

i'm working on this topology for so long and i didn't manage to make every network speak together with different VLAN on each network. On this topology: When i trace a packet sent from PC3 to PC4, ...
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49 views

Why does the Layer 3 switch drop the ping packet?

I am trying to ping from PC2 (not PC1, there's typo in the picture) to the router's int g0/0, but the packet is dropped at the L3 switch which is along the path. I have tried setting a default static ...
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35 views

How do routers. switches, bridges and hubs deal with corrupted data?

By data corruption I mean frame/packet corruption, we can stick to the corruption due to a collision for simplicity. I know that switches can detect frame corruption if they are not set to cut-...
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59 views

Can a Core Switch detect a duplicate IPv4 for two computers not directly connected to it?

I have a Core Switch (routing capability) connected to two access switches. Each switch has a computer connected to it with the same IP and same VLAN. The Core Switch operates as a Level 3 device. All ...
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1answer
36 views

Cisco IOS NTP do not sync time after reboot

I try to setup automatic syncing time on Cisco Catalyst 2960-CG-8TC-L switch using following command. ntp server 0.cz.pool.ntp.org and it works and sync time but after switch reload it does not sync ...
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3answers
38 views

Can link aggregation be substitute for stp protocol?

Can link aggregation be a substitute for STP protocol? I mean can I use 2 links with Link Aggregation to connect two switches for higher availability as an alternative to STP protocol?
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35 views

vPC + HSRP load-balancing issue on Cisco CML 2.0 lab

I am playing with new cisco cml 2.0 lab simulator and seeing strange behavior not sure if its real issue or limitation of cisco lab. dist1 and dist2 is my vPC (NSOX 9000v) peers, and tor1 is IOSv ...
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38 views

Cisco Nexus N9K-C92160YC-X kernel panicking at bootup and stuck in endless powercycle

I believe I have a bad Cisco Nexus N9K-C92160YC-X. I received this switch on loan from a customer with a blank configuration. I've recently learned that its warranty is expired and it's not ...
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1answer
32 views

Can use virtual port as the port mirroring's destination port?

Port mirroring can mirror several source port to a destination port(mirroring port). I have several questions about port mirroring. in the dest port, how to differentiate the different source port? ...
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17 views

How does Link Aggregation actually increases bandwidth? [duplicate]

For example, if we need 450 Mbps of bandwidth to transmit data and have only a 100-Mbps Fast Ethernet ports, we can create a LAG bundle containing five 100-Mbps Fast Ethernet ports. But I also read ...
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difference between Local Internet Breakout and regional internet breakout? [duplicate]

I searched over the internet but could not find the answer so i want any one of you to help me out in this. i don't know whats the difference between both of the terms and which is more preferable or ...
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34 views

Simplest way to achieve single IP communication with IP camera and simple MCU?

I have a product that uses an IP camera and a simple ATmega-based motherboard for general I/O control, managing a very simple web interface, etc. Ideally, I would like to be able to access both of ...
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1answer
46 views

Gigabit switch on a 100 Mbps router

I'm doing a file server setup, mainly I need Gigabit network on the line. I've setup a Gigabit switch in which both the client machine and the server machine is connected over the same switch. The ...
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37 views

Using a switch to dynamically connect and disconnect multiple devices together in a point to point configuration

I have an interesting issue. I have to use a switch to dynamically connect and disconnect multiple devices together in a point to point configuration, without changing anything on the end user side. ...
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2answers
35 views

Tagged frames onto untagged (access) port!

have been trying to understand ingress behaviour on untagged port, specially w.r.t tagged frames. On going through ieee 802.1q doc, i found this (8.6.2) : "Each Port may support an Enable Ingress ...
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3answers
55 views

Using MSTP with RSTP

I have two layer-3 switches connected with two redundant links that I'm trying to run PTP OSPF sessions across, a la: (OSPF) VLAN 1002 - - - - - - - - - - - - / ...
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20 views

MAC flooding for new host in L2 domain [duplicate]

This hypothetical network has one dumb L2 switch and two hosts A and B connected to it. CAM table entries on the switch are all populated and both hosts have ARP entries for each other. Now if a ...
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2answers
43 views

Can a host from different subnet bypass the network mask validation of destination host and communicate on layer 2?

I am aware that a host will always check the subnet of the destination node before the transmission in order known if it has to send it to the gatewey for different subnet. However, would it be ...
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3answers
67 views

CRC errors in DC, ruled out L1 issues

I have a very strange problem with links in one datacenter and I'm looking for some other solutions I haven't looked for yet. We have a network based on Cisco Nexus 3K and most of the core links ...
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2answers
29 views

Sending tagged traffic to untagged port?

What happens when an untagged port receives tagged frames, whether they are dropped or not !?. Say, A computer is connected to a switch on untagged port (as most would recommend). On it I have used ...
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2answers
247 views

Lost communication with automaton if a switch is used

We have an architecture like this : 2 supervision computers connected to an automaton that is connected to multiple PLC. When the computer is directly connected with the automaton, there are no ...
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8 views

Dynamic Link Aggregation Speeds [duplicate]

This might be a stupid and easy to answer question, but I can't seem to get a straight answer from anywhere. I have the following setup. Modem --> Router --> 8 port switch --> server I have ...
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1answer
53 views

MSTP: same VLANs in different regions

My network is in a state of migration from PVST to MSTP. The network has Cisco, Huawei and ZTE switches in the amount of 50 pieces and about 500 computers. In connection with this, questions arise ...
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3answers
51 views

How to communicate Different VLANs in Different Switches

I have 3 switches, 2 switches connected to 1 main switch. I have VLAN6, VLAN7, VLAN8 and VLAN9. VLAN6 has VLAN6-1 end device. VLAN7 has VLAN7-1 end device. VLAN8 has VLAN8-1 and VLAN8-2 end devices. ...
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2answers
39 views

How are packets ( received from the server ) sent to the host from the gateway ( which is present in the host network )?

If the host is receiving packets from a server, these packets have a destination IP address of the host and it is first received by the gateway present in the host network. Now the gateway checks the ...
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1answer
176 views

What is the effect of having too many bridges / routers between 2 devices?

I am building a network, with each node connected to each other using fiber media converters. They are actually a bridge with 2 ports: one Ethernet and one optical (or one single-mode and one multi-...
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30 views

Vlan Routing with ESXI and L3 Cisco Switch

Please, i need your help. I have read all the posts from the internet, but i don't know what is wrong. i want to ping from PC10 (portgroup in Vlan 10 with ip 1.1.10.200, GW 1.1.10.2) to the int vlan ...
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1answer
51 views

When the first bit reaches the host B, which bit is exit from the host A?

When the first bit reaches the host B, which bit is exit from the host A?
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3answers
92 views

How do you calculate required uplink on a Switch? [duplicate]

Lets just say i have an access switch with 8 1G port downlink, and all downlink ports are connected to the users. I want to connect said switch to an aggregation switch. How do I determine the ...
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59 views

Connecting layer 3 switches together without trunking

I currently have 2x Juniper EX4200 and I'm looking into changing it into Ubiquiti EdgeSwitchs. The diagram: SW01 and SW02 are connected to each other using OSPF P2P. Both of the switches have their ...
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1answer
32 views

Unknown device mac address listed in switch table on start out

After playing a little bit with a topology randomly created in packet tracer, I figured out that the switch (Switch0) stores a unknown device mac address on start out, wich I think that it belongs to ...
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1answer
45 views

Inconsistent address and mask error

When statically routing a route in the format [destination network address] [mask] [next hop address or interface name], I get the Inconsistent Address and mask error. Any assistance would be ...
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10 views

Determine the range of IP's avaliable for hosts on a subnet /28 [duplicate]

I am looking into my Virtual Switch configuration( Hyper-V ) and i am confused how the range of valid IP's is determined. The IP for configured for the "Virtual Switch" adapter is: IP: 192.168.53.65 ...
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26 views

Cisco Router Interface Connection Problems

I am new to networking and am configuring, I am trying to setup my connections in packet tracers for 3 different routers to talk to each other over Serial ports as attached. However, I did notice ...
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2answers
77 views

Do I need STP enabled on all switches in a loop?

I have a network architecture where each of my N switches is connected to two others, making it a perfect loop. For example see the diagram below: I know that in order to avoid broadcast storms, I ...
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2answers
50 views

Is it better to put a switch between the router and a host when running a long wire?

I want to run a 90m cable from my main router to a host. It will work, as 90m does not exceed the maximum length allowed. Router --(50m)--> Switch --(40m)--> Host A If the cable is long or has ...
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25 views

How Redundant Ethernet Bonding Works [closed]

I am currently trying to implement redundancy whereby hosts have 2 eth ports and both ports connect to different switches. If either switch fails (or if any port fails) there will still be a way to ...
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5answers
50 views

IP Helper in Multiple Access Switches

Just a dumb question.. I have 1 core switch and 5 access switches. Just wondering if it would be best to setup the IP helper on all access switches rather than just on the core switch? Does this ...
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1answer
44 views

Multiple mac adrress on one cisco switch interface

How can i config Multiple mac address on one cisco switch interface? (I have 3 laptops and i connect only one laptop every time(I switch between them), and i want to config only one interface with the ...
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1answer
28 views

HP5130: Cannot ping vlan interface

I have a really simple set-up but I still cannot find what is wrong. Sorry if duplicate, I searched and didn't find. I have a HP 5130 switch, I install 2 VLAN (30 & 42) + the VLAN 1 for ...
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3answers
491 views

If no CSMA/CD on switches what are they using

As far as I understand, CSMA/CD is an access method to place Ethernet frames on the wires in computer networks. I read everywhere that switches are not using this access method because they are full-...
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44 views

Issue connecting two Extreme Networks 220 series switches together, with only one VLAN

I am in the AV field, which as a lot of IT folk know is becoming a lot closer with IT, but my networking knowledge is limited aside from the basics. We have a system in place with AV over IP devices,...
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2answers
89 views

Routing in layer 3 switch vs old modem/router?

I believe what I am about to ask is on-topic. I have Cisco DPC3828S (wireless router/modem) from ISP, which I cannot turn into bridge. So, it does routing. I have layer 3 switch, Cisco SG350-10. ...
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1answer
29 views

How do (LANCOM) Tag-Based vlan groups work and on which vlan does the device respond?

I just started a new job and part of it is to manage and maintain the ICT. As the previous network/system engineer left the company i'm on my own to figure out how everything works. I have ...
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1answer
83 views

EXOS layer2 Configure on a Summit x440-G2-24p

I search since Days for a working configuration for a layer2 connection from another extreme switch to this switch. What I connected Physically on my Summit x440-G2-24p: the ethernet(lan) cable from ...
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1answer
70 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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3answers
53 views

setting up a VLAN and joining 2 buildings through underground cabling

I am pretty much a newbie when it comes to networks so forgive me in advance if this question seems odd. So here's a situation I am trying to figure out. There's a company who operates in 2 adjacent ...
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1answer
32 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
73 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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