Episode #125 of the Stack Overflow podcast is here. We talk Tilde Club and mechanical keyboards. Listen now

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.

Filter by
Sorted by
Tagged with
4
votes
1answer
640 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 ...
2
votes
1answer
43 views

secure authentication over LAN 802.1X

secure authentication over LAN I have installed FreeRadius Version 3.0.12 server, we debian 9.4.0, and I want to secure my LAN, that means, nobody can connect to the LAN if its MAC address is not ...
1
vote
1answer
50 views

switch wireshark arp

I connected 4 pcs to a switch, I used pc 1 to ping another pc(pc 3) and used wireshark on all the pc's. The one that sent the ping sent out an arp request and received 4 request and replies from the ...
2
votes
1answer
88 views

Understanding Vlans

I've started reading about VLans, do vlans always know what port to forward messages to or are the like switches and sometimes they don't know the mac address so they just flood it to all ports? Or ...
1
vote
1answer
232 views

Disable STP and force port state on a Avaya 4950 switch port

I know how to connect a switch on a router Avaya VSP 7200 by disabling STP with the command : no spanning-tree mstp force-port-state enable but how to force port state on a switch Avaya 4950? ...
0
votes
1answer
340 views

Quanta LB6M : how to make trunk port

My hardware is (quanta10g-uha) #show hardware Switch: 1 System Description............................. Quanta LB6M, 1.2.0.14, Linux 2.6.21.7 ...
0
votes
1answer
311 views

Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems?

Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems? Please, refer to the attached drawing. What are the equivalent Cisco Switches ...
2
votes
2answers
85 views

InterVLAN routing issue

I've got one L3 Quanta switch. Having a bit of trouble in understanding the right way to configure VLANs and inter-VLAN routing on it. Routing on the switch is enabled. Ports 0/3 - 0/40 are ...
0
votes
0answers
67 views

Block internet on a Cisco catalyst 3560 port

Good day Is there a way to block a specific port in a Cisco Catalyst 3560 switch to block the user from accessing the internet but still have full access to the internal corporate resources. The ...
0
votes
0answers
44 views

Allied Telesis AT-FS750 MAC authorization with FreeRadius

It is possible to configure mac based authorization with FreeRadius on AT-FS750? We need block device in our network with unknown MAC address. Or set limited access with specify quest VLAN.
2
votes
2answers
374 views

Fastest spanning tree in multiple-ring topology

I have a topology in which there is a main ring and some nodes in the main ring have a minor ring. 1- which STP configuration has the fastest convergence time? How would you configure spanning tree ...
2
votes
1answer
165 views

HPE IRF Stack why do I need two physical ports?

I'm building exactly the same topology, but there is no explanation why do I need two physical interfaces in IRF stack? So, can someone please explain me, why do I need two physical members in IRF ...
6
votes
2answers
192 views

How to display entire MAC address table on HP switches

I want to display the whole MAC address table without needing to press 'space' for the next page, so that if there are 50 entries in the table I'd be able to view them with a single command. I'm ...
9
votes
3answers
2k views

I have a single ethernet switch. Should I use spanning tree?

I have a single ethernet switch. Should I use spanning tree? If there is a redundant link, definitely need to enable STP. In a single switch, how is it possible to have a redundant link? Any other ...
3
votes
2answers
372 views

QoS for OSPF, VOICE and CRITICAL Traffic

I plan to implement the QoS policy below. The target is to garantee bandwidth to VOICE and CRITICAL traffic. It should be 1/3 for Voice and Video, 1/3 for Business Critical traffic, 1/3 for all the ...
3
votes
1answer
159 views

inconsistent bad mask error

in packet tracer i was assigning: 83.174.16.164 255.255.255.248 to 3560 switch which shouldn't throw an error of bad mask given that it is in the usable range: Address: 83.174.16.160 ...
0
votes
1answer
2k views

Brocade smooth reboot command

I am newbie regarding switches. I have Brocade ICX 7250 and 7450. I would like to know, what is the command for smooth reboot of switch. I do not want to unplug power cable and lost configuration. I ...
0
votes
0answers
67 views

reset DAX switch

I have been working on configuring a network switch from DAX networks for my under-grad project. The model is DX-5048gs to be precise. The previous user has lost the credential for accessing the ...
4
votes
3answers
317 views

Switch and mac address table

I thought that a switch learnt the mac addresses by the computers sending out packets. However when I configured 2 switches, and 2 pc's, 1 pc connected to 1 switch, the other pc connected to the other ...
-2
votes
1answer
37 views

Textbook has different order of commands: login password password-value and also password password-value login Does the order matter?

Textbook has different order of commands: login password password-value and also password password-value login Does the order matter? Cisco switch
3
votes
1answer
88 views

Port security on a cisco switch - predefined source MAC address and maximum number of MAC addresses

With port security on a Cisco switch, if you configure 1 source MAC address, does that also set the maximum MAC addresses to only one?
1
vote
1answer
180 views

Right Cisco switch for iSCSI SAN network

I'm trying to revive this old HP P4500 Lefthand SAN and recover some data from it. There was a pair of Cisco switches configured for the SAN traffic. Those are no longer there. All I have access to ...
0
votes
0answers
28 views

Tracking on a Switch

Is there a way to track on a Cisco Switch (WS-C2960-24TT-L, IOS 12.2(25r)SEE) on interface states? I would like if an interface failed, for another to fail with it (err-disable, shutdown, whichever)....
1
vote
2answers
69 views

Which parts cost most of CPU and Memory resources in Router or Switch

I'm a new guy of enterprise network traffic optimization. I'm very curious why the enterprise Router or Switch so expensive. As in my mind the Router just look up route table (I guess it should be a ...
2
votes
2answers
38 views

Can Layer-2 Switch deal with different Segmented IP

I have the following question confused, we suppose: in my lab I have 10 linux servers and one layer-2 switch, I tried to separate them to 5 groups: Group one: 10.1.1.0/24 include server1(10.1.1.2),...
5
votes
3answers
685 views

Understanding hubs and switches

Newbie here. I'm trying to understand how hubs and switches work. I read that hubs only forwards to all ports but a switch only forwards to the port it needs to. So, If I connect 3 computers to the ...
2
votes
1answer
115 views

Broadcast domains switches

If I connect 3 computers to the same switch and used one of the PC's to ping another PC on the switch will this cause a broadcast domain as they are connected to the same switch?
2
votes
1answer
46 views

One Fiber Optic Line 24 Cores for Multiple Services Transmission

Hello we have a construction project for building a compound of 50+ villas. The aim is build and connect the villas all together transmitting all services through the fiber optic. The services ...
3
votes
2answers
173 views

Mgmt Vlan vs other SVI s

Think of a layer 3 switch. Assume that we have a management vlan and a mgmt vlan interface. And we have other svi's on the switch. The question is this. I know that mgmt vlan is for telnet/ssh, simply ...
2
votes
1answer
67 views

How to connect a switch with a router via another switch?

ROUTER CONFIG Router#sh run Building configuration... Current configuration : 769 bytes ! version 12.4 no service timestamps log datetime msec no service timestamps debug datetime msec no service ...
4
votes
1answer
149 views

What are reasons to configure a Voice VLAN using the Auxillary VLAN feature instead of a Trunk + Native vLAN

Imagine this topology: [PC] ------- [VOIP Phone] ------- [eth0/0 on a Switch] And this configuration on the switch: vlan 22 name DATA vlan 33 name VOICE There are two ways to have both the PC'...
0
votes
1answer
190 views

Finding the IP address of a Cisco 3750G

Hello i have a Cisco 3750G switch and i need to find the IP address and I dont have a serial cable, so I need the IP address to login into the web-interface. Does it need to be connected to a network? ...
0
votes
2answers
39 views

Stack network power transfer

i have 2 cisco catalyst 3750G's, and a stack cable a have a question about the stack does is transfer power so do i only need 1 power cable or 2 and is there a way to reset the password without a ...
1
vote
1answer
208 views

How does ARP work on multilayer (Cisco) switches

I'm going to develop an example scenario here: There is a computer that is connected to an interface on the switch that has been assigned VLAN2 and another computer on an interface that has been ...
0
votes
1answer
311 views

Private IP vs MAC

What I know is that when we connect to another IP, our Public IP gets shared to the outside world, and when they address us they use our Public IP (gateway), and then the gateway directs the ...
1
vote
2answers
224 views

HSRP limitations on Catalyst 3560

I have read all of the documentation so many times that I put myself into a headspin. Now the sentences I read don't make any sense. What exactly is the HSRP limitation on Cisco Catalyst 3560 ...
1
vote
1answer
164 views

How can I configure link aggregation/bonded LAN for my simple Ubuntu router build? [closed]

I'm spinning out on this one...! Someone please help! I followed this fab tutorial below to make my own Ubuntu based router: How to build a simple router Ubuntu Server 18.04 Which works great using ...
3
votes
2answers
37 views

LANs with no router,just a switch(or hub)

Can a LAN be implemented just with a switch? If so,how is the communication completed?just by MAC addresses? When sending a frame from the source to the destination,and inbetween there is a switch,...
3
votes
1answer
267 views

Cisco ARP cache rewrites?

I know that the Cisco's default ARP entry expiration is 240 minutes, however how does the ARP table mechanism work when a different MAC address is seen using the same IP? In other words, if I move ...
2
votes
2answers
97 views

Bridge 2 VLANs using layer 2 device

This is a screenshot from a Cisco book. It says that 2 VLANs can be bridged using some L2 device also. As far as I know it is possible only by using some L3 device. Can someone please explain it how 2 ...
4
votes
2answers
345 views

Network Redundancy with LACP Trunking

I would like to set up a redundant link between two switches. I have four ports available to accomplish this. Scenario A: Switch 1 has ports 1+2 trunked together via LACP. They are plugged into ...
0
votes
1answer
737 views

missing Packet tracer physical Tab

hello I am using packet tracer for a while.I use in my college computer. but recently I installed in my pc. when ever I try to add extra ports in my rouer or switch the physical tab is missing
4
votes
2answers
539 views

Nexus 3172T MTU

I am attempting to set the L3 mtu on a Nexus port. The mtu option is only available if I set "no switchport" which then prevents me configuring VLAN related settings. Am I missing something obvious? ...
5
votes
1answer
44 views

Junos how to execute a lot of repetitive commands?

In my Juniper qfx Switch, I want to execute many commands such as bellow: set vlans vlan77 vlan-id 77 set vlans vlan77 l3-interface irb.77 set vlans vlan78 vlan-id 78 set vlans vlan78 l3-interface ...
1
vote
1answer
38 views

Physical labeling of switches and patch bays

This has to do with the physical install of network equipment, if there is a better place to ask please let me know. How do you physically label your switches and patch panels? I'm having trouble ...
0
votes
1answer
233 views

will wireless devices' MAC address be saved on layer 2 switch?

So I know that basically switches work like this (assuming 2 PCs are connected via Ethernet port) - the switch will store the mapping of the 2 PCs' MAC address and the switch ports in which they ...
0
votes
1answer
68 views

The Egress to switch port is direction a or direction b?

I have a doubt about the switch port Egress direction and Ingress direction. you see the upper have Egress rate limit. I want to know the Egress to switch port is direction a or direction b?
0
votes
1answer
130 views

Login local , login synchronous

I dont understand what those two comands mean when im enabling ssh on Vty-line. Can someone please explaim me please whatthose comand do and why i need to use them?
1
vote
1answer
42 views

I limit the port INGRESS but get packet loss

I use the limit speed method to limit the Juniper Switch port EGRESS and INGRESS speed. but after I added the INGRESS filter to my port, there will loss packets on the switch every port. anybody ...
1
vote
1answer
47 views

What does the speed of Network Switch actually mean?

Network switches usually come in speeds of 10/100/1000 Mbps, and that's all fine and dandy, then I got thinking.. Suppose I have an 8 port 1000 Mbps switch, each port connected to a client. If a ...