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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12 views

NFS/SMB - cluster phenomen (blade center / synology / multi nic) [on hold]

I hope someone can help me as we have in the company a strange issue and not even our network experts have an idea. The setup: We have a hyper-v cluster hosted on 16 blades in a HPE blade Center/...
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21 views

How to filter the physical port of the switch through snmp?

I tried using snmp to get ifdescr, I think the interface name containing Ethernet might be a physical port, but I am not sure. In addition, the interface in dot3StatsIndex is also like a physical ...
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1answer
24 views

Does a Network-Switch changes TCP-Packages? [on hold]

I am investigating a network issue, where our driver(s) under VxWorks7 is generating errors-messages like: "Notice: resend delayed, network driver has not finished the previous TX attempt on this ...
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41 views

How do VLANs Work? Some Basic Questions:

I've recently started looking into VLANs. I am a network novice so bear with me please:). I have a few questions regarding VLANs. I understand that certain managed switches allow you to create VLANs. ...
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28 views

Korenix Switch JetNet 4508v2 SSH Problem

Does anybody know, or has anybody worked with Korenix JetNet 4508v2? This Switch has a very important Bug in the Firmware. SSH is working fine, but for a period of time. Then, ssh is not working ...
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15 views

How to properly daisy chain network switches? [closed]

My setup will be similar to the image I created above. Let me summarize: My old Cat3 phone lines will be converted to ethernet by simply adding some ethernet plugs on the end of the cables. I'll then ...
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2answers
45 views

Can a router route 2 switches with multiple vlans and subnets

Good afternoon/evening, Today on my Cisco Packet Tracer, I made two layer 2 switches and 2 PCs on each switch. I created a vlan 10 on the switches. I trunked the switches together so they can see ...
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17 views

Dell PowerSwitch S4810 - Cumulus Linux password reset not working

I’m trying to login to a Dell S4810-ON and the default username/passwords are not working ([https://support.cumulusnetworks.com/hc/en-us/articles/201787646-What-is-the-Default-User-Name-and-Password-...
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1answer
38 views

Do I need to configure a managed switch if I want to use it as unmanaged?

I'm a bit confused with the whole managed switch setup. I understand from a friend that if I want to use a managed as an unmanaged switch, I just need to use it directly out of the box without any ...
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3answers
56 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 ...
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1answer
78 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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73 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 ...
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11 views

Why we need routers when there is layer 3 switches [duplicate]

I know that routers only do routing but layer 3 switches can do both switching and routing. my question is why we still need routers when we have layer 3 switches ?
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38 views

Using 2 different ISP In case one dies

It's my first ever post in here and I hope not the last. I'm looking for some advice. I'm trying to reduce my internet downtime for a local network. My setup. Mix and match computer environment (...
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1answer
39 views

Upgrading Cisco 819 to 809, can I connect devices to 2 routed ports and be on same subnet?

The company I work for has multiple remote "IoT" style sites connected back to the datacenter via a Cisco 819 cellular router. We are in the process of upgrading these to the newer Cisco IR809 routers ...
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1answer
20 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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1answer
50 views

Ping across VLANs using layer 2 switch

I'm trying to ping one PC on one particular VLAN (VLAN 80) from another PC on a different VLAN (VLAN 50). I have a layer 2 switch (Cisco 2950T), so I can't do it from within itself. How would I be ...
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3answers
93 views

How do devices connected to a switch get their IPs?

It should go without saying, I'm all new to networking and there is plenty I need and want to learn about. One of the things I'm not clear on and couldn't find a satisfying answer to, although I've ...
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1answer
36 views

Why Meraki Switches have DNS defined in their settings?

What a Meraki switch would do with DNS? switching has nothing to do with Domain name resolution.. the only thing I can come up with, is that their switches probably using some type of domain address ...
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1answer
56 views

Two switches, one uplink - best way to link them?

Overview I have two Arista 7050SX switches. They don't support stacking. But I essentially will be using them as a stacked pair none the less (just means managing two individual switches). They're ...
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1answer
46 views

I need help in creating OSPF between MultiLayerSwitch and Routers in packet tracer

I know we cannot create OSPF with different subnets. What network addresses should I put in the MLS and R1 to make it adjacent? Here's the configuration for MLS: interface FastEthernet0/15 no ...
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817 views

Why I have higher ping to the VLAN interface than to other local interfaces

I wouldn't call it an issue, but I'm curious. On our Quanta switch we have a couple of VLANs and vlan interfaces accordingly. Let's say I'm on a computer in VLAN 10, if I do: ping 192.168.10.1 ...
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39 views

Arista switch - getting chassis ID of currently logged in switch

I can not find how can i check local switch Chassis ID. here i found that command: show lldp local-info management 1 should show me what i want but there is no "local-info" option. Is there any ...
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88 views

Is this scheme- An Ip camera network completely isolated from rest of Intranet

IP camera network completely isolated from rest of the Intranet work and for connecting each IP camera at mutually 900 m TO 1.5 km distanc to switch near NVR about 800 to 1.5 km from each IP camera ...
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1answer
27 views

HSRP - How do I know the hostname of the standby router

How do I know the hostname of the standby router if I don't have a topology drawing? ''' Vlan190 - Group 0 State is Active 2 state changes, last state change 1w5d Virtual IP address is 172....
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99 views

Aruba switch — rate limiting causing TCP packet reordering?

We just finished debugging a really interesting bandwidth problem on intercontinental WAN links aggregated by Aruba switches. According to tcpdump captures, using a rate limiter of any speed on a ...
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42 views

C2960 - Memory has insufficient capacity

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 ...
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1answer
37 views

How to make a printer visible to two different subnets?

How are you? I hope well. As you can see by the tittle I'm in the middle of a situation that i have to access a print in another subnet. These subnets are operating in different switches(Switch A and ...
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1answer
55 views

Any expected issues with stack of 8 Cisco 3750X switches?

I am planning the network for our new offices this time utilising Cisco 3750X's (WS-C3750X-48P-S). The required port count has gone up and up so have had to procure some extra switches to bring the ...
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1answer
17 views

Mask Extension and Logic Minimization

I was reading a paper (Routing Table Compaction in Ternary CAM) which reads as following : "The mask extension technique reduces to a logic minimization problem. In the discussion, I use cube to ...
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3answers
263 views

Leaf-Spine network without routing

If I have a leaf-spine network with all the servers on the same subnet, say 10.10.0.0/16, do I need a router (or l3) since everything is on the same network and the network is flat?
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29 views

Cisco HSRP tracking option

I'm trying to setup hsrp to track a couple of interfaces in my cisco packet tracer lab, but I can't seem to be able able to choose the decrement value that I want (which is 50) and I only get the ...
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1answer
86 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?
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29 views

POE negotiation between IEEE PD and the POE Switch?

I know that there happens a negotiation between the IEEE PD devices and directly connected POE Switch through CDP or LLDP protocols. But if for some unknown reasons, if the CDP/LLDP is disabled on the ...
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1answer
58 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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49 views

How does VTP deal with revision conflict

I was wondering how VTP protocol deals with revision conflict? E.g. VTP clients and servers are up to date with the latest database revision X. Suddenly two VTP servers propagate revision X+1 with ...
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2answers
58 views

Fiber connection between a switch and a media converter

I'm trying to connect 2 buildings with a MMF (OM2). Here's my setup: Media converter side: MC: https://www.fs.com/products/17237.html SFP: https://www.fs.com/products/29838.html Switch side: SFP ...
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52 views

Can't get to the Internet from VLAN on switch

I'm trying to setup a network lab to learn more about networking. Equipment: 2 procurve switches. 1 Sonicwall firewall TZ300 The final outline: traffic from Vlan 10 on switch 1(port1) goes to ...
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53 views

Can you stack Cisco 350 28P PoE switches with CAT5E or CAT6 ethernet cables?

I have four new Cisco SG 350 28P PoE switches, but no stacking cables. Can I use CAT5E or CAT6 ethernet cables to accomplish stacking them?
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42 views

Cisco SMB Switch Configuration for VOICE VLAN and DATA

I am hoping to get some assistance with a current issue I am facing at the moment... I have 3 Cisco SMB Switches, (2) SG300 Managed Switches and (1) Unmanaged Switch. SWSG1 | 172.16.1.100 | Port 24 ...
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1answer
152 views

Migrating Configuration - 3750G to 3750X

What is the best practices to migrate configuration from an older Cisco switch model to a newer Cisco switch model? -I am not expecting to change any configuration, just simply want to be on the ...
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1answer
36 views

In IP6 fe80::8a10:8fff:feb7:1632 > ff02::2: ICMP6, router solicitation , length 16

When I use command to capture the packages of interface ae52.0 in my EX4300 gateway Switch (L3): run monitor traffic interface ae52.0 I get many In IP6 fe80::8a10:8fff:feb7:1632 > ff02::2: ...
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Connect Brocade icx-7450 COM with laptop

I have brocade icx-7450 managed switch and need to configure it with packetfence server. Still I'm not able to connect to the switch. Tried with mini USB to USB, RJ45 and USB male-male cables.
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73 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
46 views

ARP source address behind a switch

I have an ECU sending ARP request to another ECU destination and it's working fine. the problem arises when I use an automotive switch in between. the source IP address is 192.168.0.12 the switch ...
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89 views

What happens when a switch receives a packet with an unknown source MAC address?

The CAM table cannot be populated with the source address so other action must be taken. Is the switch going to drop the packet?
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46 views

Why my ae interface Link type is down but the physical interface is up?

Why my ae interface Link type is down but the physical interface is up? In my convergence layer Switch, I use two Juniper EX4300 devices realize the Stack: so there have xe-0/0/x and xe-1/0/x ...
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1answer
109 views

Switching interface VLAN ID Mid-Production

I was wondering if there was a way to switch out the VLAN ID from VLAN1 to VLAN10 without impacting the connectivity of the end users? Can I simply copy and paste from one interface VLAN to another? ...
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1answer
45 views

Is it possible to differentiate cisco ports on monitoring system via snmp?

I am managing some cisco switches in my monitoring software (zabbix), and it provides useful insights that I would like to monitor: Warning on link up / down Warning when ports are on half duplex ...
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95 views

Cisco nexus STP loopguard

I have cisco nexus switches in vPC and they are connected to HP c7000 blade center switches and all my c7000 blade server has Linux Bridge is running, i believe something went wrong somewhere in Linux ...