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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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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3 answers
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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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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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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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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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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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103 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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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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460 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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347 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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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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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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3 answers
367 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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2 answers
662 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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2 answers
403 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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1 answer
287 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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3 answers
266 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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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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2 votes
1 answer
275 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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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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3 answers
625 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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85 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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1 answer
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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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1 answer
369 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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2 answers
902 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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2 answers
89 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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0 answers
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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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  • 113
1 vote
7 answers
2k 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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1 answer
537 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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1 answer
220 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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2 votes
3 answers
2k 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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0 answers
215 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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3 answers
507 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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1 vote
1 answer
211 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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0 votes
2 answers
801 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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2 votes
2 answers
768 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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1 vote
4 answers
293 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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1 vote
2 answers
307 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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1 vote
1 answer
3k 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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2 votes
1 answer
80 views

MACsec Switch-to-Switch authentication/encryption

I have some questions regarding MACsec IEEE 802.1 AE-2018 and PNAC IEEE 802.1X-2010. As I have heard there is no swich-to-switch protection with 802.1X-2010 by this standard I want to know where is ...
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-1 votes
1 answer
35 views

What is the packet protocol used for communicating switch configuration changes over the network? [closed]

I am trying to isolate the packets used to communicate a switch's configuration changes. More specifically, whenever I use the online tool on my laptop and configure the switch (and hit save) I want ...
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1 vote
0 answers
23 views

How are switch tables updated in a multi-switch network? [duplicate]

I have a network structure like the below: Switch A - Switch D / \ Switch B Switch C / | \ / | \ \ 1 2 3 4 5 6 7 Where 1..7 are hosts. If 1 were to send a ...
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1 answer
81 views

Wireshark filter to display al packets which have traveled through switch

I am trying to filter my packets based on whether or not they went through specific switch. This router has the ip address of 192.168.1.235. Is their a way to do this using Wireshark filters?
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1 answer
819 views

How to combine multiple ADSL lines?

Before beginning, I'm totally new to advanced network topics and not working as a professional network engineer or so. Just trying to learn some stuff. My problem is, I have 3 different ADSL (or VDSL)...
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0 votes
1 answer
395 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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2 votes
1 answer
844 views

How do I split static IPs from an ISP for separate usage?

I have a lot of IT experience/consulting, but want to test what I have done against some of the real experts hre in the networking field so I can keep learning and do what's best. I have ISPs with 5 ...
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1 vote
2 answers
66 views

Will the switch itself interfaces store in the MAC address table?

I have a topology like this: the port and mac address map: Mac address Interface ----------- --------- aa:aa:aa:aa:aa:aa - pc1 bb:bb:bb:bb:bb:bb - pc2 cc:cc:cc:cc:cc:cc - sw1_ac dd:...
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0 votes
1 answer
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sfp-25g-sr-s alternatives

I work at a media company and we have a room where we're essentially having a spine leaf topology implemented for our network. Now there's 4 spine switches and 6 leaf switches, the sfp we're using are ...
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1 answer
49 views

What is the difference in packet structure for tag VLAN and port VLAN

I am new to networking. I just want to know the difference in ethrenet packet structure for tag based VLAN and port based VLAN. For tag VLAN, a VLAN tag is added to the ethernet packet frame so that ...
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1 vote
1 answer
746 views

Is WIFI like a hub, switch or router?

A wireless router; the wireless part of it, is that a layer 2 or layer 3 device? I have heard that a WiFi router is just a wired router with a built-in wireless AP, and since a wireless AP functions ...
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