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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Could a layer-2 loop explain mass duplication of ARP requests, and of ARP requests only? [closed]

We are investigating a standard structured /24 IP network. It is suffering from a high load of broadcasts (~100pps) that is inappropriate for the size of the network (~170 hosts). We found that ARP ...
Nils Toedtmann's user avatar
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what is the 00-00-00-00-00-00 mac address mean? [closed]

"Hello, I'm encountering an issue with my TP-LINK switch model TL-SG3428X 1.0. Upon inspecting the MAC address table, I've noticed an entry with the MAC address 00-00-00-00-00-00. I've attempted ...
RAJA's user avatar
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where the mac address comming from like 00-00-00-00-0A-0B [closed]

hey there i am using some epon olts for provoiding internet to my peoples, now it show some mac address like 00-00-00-00-0A-0B what is this and why?
Raja's user avatar
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How to setup a small local network via a Supermicro SSE-F3548 switch [closed]

I have a Supermicro SSE-F3548 switch and want to use it to connect several ubuntu servers in my rack via a 25Gbit connection. At the moment I have the 25Gbit card of one ubuntu 22.04 server connected ...
gha's user avatar
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3 answers
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Core Switches Redundancy Problem

I have network. I have three different networks and 2 vlans. PC0 is a member of vlan 10, PC1 is a member of vlan 20. One of the networks for vlan 10, another one is for vlan 20, third network is for ...
shiva13's user avatar
6 votes
3 answers
658 views

Can ARP tables store addresses for other networks?

This is perhaps a weird question, but I'm in a weird situation where I want to route traffic from network A 192.168.1.0/24 to network B 192.168.2.0/24 via 192.168.1.5 (the address of B-router in the A ...
TrisT's user avatar
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Cisco nexus C93180YC-EX sflow configuration

I am running cisco nexus C93180YC-EX switch and I would like to enable sflow for collector. I did similar config on 9396PX model and it works but Nexus 93180 is little different. I am running NXOS 9.3....
Satish's user avatar
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should I go multiple switch or one big switch

So I have a 2.5Gbps NIC on my server PC, but my main questions are: note: I'm using consumer grade switches will a 2.5Gbps switch split the load with two 1 Gbps switch? will the 1Gbps be better on ...
randomaire's user avatar
1 vote
1 answer
33 views

Using a switch and a pc to test the ports of another switch that resides in a device I wish to test

I have a PC and a switch, lets call it the Tester. There is a device I wish to test which has an internal computer and a network switch. Let's call it the Device. The Device has 16 network ports that ...
George Palickar's user avatar
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1 answer
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Reset and Login Issues with C9500-48Y4C Switch

I have a Cisco C9500-48Y4C Switch, but I forgot the login credentials while configuring it, which has resulted in me being unable to access the Switch. Could you please guide me on how to reset this ...
berniecheniitt 's user avatar
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VLSM Error on Cisco Distribution Switch [duplicate]

I have created 3 VLANS which should not overlap but somehow are giving me overlapping problems. Any reasons why? Is the switch buggy? VLAN 10 10.1.1.0/28 255.255.255.240 Usable:10.1.1.0 to 10.1.1.15 ...
Xavier Lim's user avatar
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1 answer
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Lot of packet retransmission with bonding (802.3ad) on switch between two servers

I am currently working on setting up a 2 node-storages network with Mellanox 2x 10Gbit cards, connected through one mikrotik switch CRS326-24S+2Q+RM. I have configured bonding in mode 802.3ad with ...
enp4s0f0np0's user avatar
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2 answers
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Is it possible that not adhering to a standard color coding in ethernet cables would affect performances?

I have two gigabit devices connected to a gigabit switch using cat 5e ethernet cables, but the wirings on the RJ45 connectors do not respect any of the established color standards, because they were ...
leonixyz's user avatar
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VoIP SIP PCAP issue

I have a question for anyone who might know the answer. My boss has asked me to PCAP a SIP stream from a VOIP phone by plugging my laptop into the same unmanaged switch, without enabling port ...
Dylan Gray's user avatar
1 vote
1 answer
25 views

Cisco QSFP loopback device recognized but 'not connected' with status light off

I have tried plugging a QSFP28 loopback device into port on a cisco switch. I can see that the chip is recognized when I do 'show interface status' as I can see the model listed but it is 'not ...
Louiee's user avatar
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What is the difference between these OIDs on a Aruba Wlan Controller?

For my bachelors thesis, I have to monitor the WLAN Access Points of the university campus. For example, number of connected Clients and how many Clients are connected to each Access Point. Therefore ...
Schmida's user avatar
1 vote
1 answer
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If a cisco switch is on the other side of a wire when it's plugged into a cable tester; is that dangerous?

This cable tester has numbered fobs that plug in the other end of an Ethernet port and report back which number they are; If the cable tester is accidentally plugged into a switch port when the test ...
leeand00's user avatar
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what happen to packets passing through switches and routers?

I am learning networks from hardware and software aspects. assume below scenario: we call computers with c prefix, switches with s and routers with r. all macs and IPs are summerized. c1 ip=1 mac=xx ...
user3840019's user avatar
-1 votes
2 answers
54 views

Can I get into configuration mode by command "config" instead of "configure terminal"?

I would like to ask: When I configure router or switch in for example Putty, can I get into configuration mode by command "config" instead of "configure terminal"? Or I need to use ...
Mirek's user avatar
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Verify brand name of installed SFP on Cisco Switch

I know I can run the sh inv to view the SFPs model and Serial Numbers attached on a Cisco Switch. Is there a way to verify the brand name of each SFP? I have Cisco 9300 and 9606 switches.
Rick151's user avatar
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1 answer
101 views

Too many mac addresses in a switch - Cisco Packet Tracer

The image of a network im refering to is above. In Cisco Packet Tracer after having used a command ping 192.168.1.3 from pc1 to pc3, when I check mac addresses in both SW1 and SW2 using show mac ...
pieceofpaper's user avatar
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Problems with twice-NAT on Cisco 3548

I'm trying to get Twice-NAT working on a Cisco 3548 switch. I have a VRF set up with 2 L3 ports on it - Eth1/33 has ip address 20.20.255.250/16 and is nat inside Eth1/34 has ip address 10.10.1.211/24 ...
Kevin's user avatar
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1 answer
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Can't ping between cabled interfaces on different VRFs on same switch (Cisco 3548)

As an experiment I've created a non-default VRF, directly cabled between an L3 port on the default VRF and an L3 port on the non-default VRF, and am trying to ping between them. Neither interface can ...
Kevin's user avatar
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2 votes
1 answer
175 views

'SGMII' in copper SFP modules

Currently I see three types of 1Gbps copper SFP modules at the same store: "SFP 1000BASE-T" "SFP 10/100/1000BASE-T | SGMII" "SFP 10/100/1000BASE-T | SGMII | Rx LOS" If ...
u1686_grawity's user avatar
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71 views

Is there a way to gather data of Optical Module Status and the CPU Utilization through SNMP protocol?

When using the snmpwalk command to query a Cisco SF302-08PP switch with the -c public community string, am not able to find data related to Optical Module Status and CPU Utilization. I am trying to ...
mema's user avatar
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End to end delay over N link including the (simplified) propagation delay

It is well know (see this question) and easily verifiable that end-to-end delay in case of trasmission of P packets of size L over N equal links (same transmission rate R) with zero propagation delay ...
frhack's user avatar
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noob learning cisco

I'm trying to teach myself how to use cisco devices. i was given an router, switch and firewall. so far i been able to set up vlan and have intra vlan routing working. My issue is having the switch ...
Stu Villanti's user avatar
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1 answer
51 views

Do unmanaged switches automatically do bonding/multi-link? [closed]

If i have 2 cheap unmanaged non-smart consumer level switches such as "Netgear GS308", do they support having 2 cables between them, and effectivly having 2gbit transfer between them? or ...
bizzehdee's user avatar
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1 vote
1 answer
135 views

Are integrated networking devices, frequently called routers, of the switch type or of a router / NIC type?

Odom,Wendell-_CCNA_200-301_Official_Cert_Guide,_Volume_1.pdf : many SOHO Ethernet LANs today combine the router and switch into a single device. Vendors sell consumer-grade integrated networking ...
John Smith's user avatar
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2 answers
77 views

Interface is down/down but internet works

I am managing a network at my company. A patch panel provides connections to the switch, which is connected to the router. One of the connections on the switch does not display a blinking green light. ...
Jossie Calderon's user avatar
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1 answer
104 views

Switch ping to router with trunk port

If I have a switch port trunk directly connect to a router with the follow scenario below: -------- g1/0/1 (Trunk) g1/0/1 |------| |switch| Native VLAN 1 SVI=...
Andrew's user avatar
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1 vote
1 answer
39 views

HP 6125XLG switch in IRF not passing traffic on standby switch

I have HP 6125XLG switches in HP c7000 chassis. I have setup for IRF config (similar to Cisco vPC). I have configured all my blades in LACP active-active and everything works fine. But one of blade I ...
Satish's user avatar
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-1 votes
1 answer
40 views

Cisco VLAN Taking up Entire Subnet

I have a default vlan 1 that has an IP configuration of 10.20.11.0 with a subnet mask of 255.255.255.0. I have an AP 10.20.11.55 that I want to place on its own VLAN because I intend to make this AP ...
Jossie Calderon's user avatar
0 votes
1 answer
54 views

Why my high speed UDP transmitter send package to all devices after being disconnected from the server?

Here is my network configuration: My Embedded board(192.168.124.249) sends a 16-byte UDP packet to my PC2(192.168.124.10) each 1ms. Here is my PC2 received data: Everything works fine until I ...
John Jin's user avatar
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-1 votes
2 answers
81 views

Setting up a local network with access to the internet through a wireless access point

Intro At work we want to setup an 8 node raspberry pi cluster. The purpose of the cluster is to test different technologies and have a good time. We cant manage the wifi at work and the only way we ...
Christopher Brøndholt's user avatar
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1 answer
40 views

Connecting a hub to my switch bypasses RADIUS/802.1X

I have set up a windows nps server (radius), it works with eap-tls. In the switch when the authentication is validated the port is passed in vlan 100 and when it is refused it is passed in vlan 101. ...
Nivys's user avatar
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0 answers
32 views

Cisco switch ios update without change license

I need the following ios switches to be updated to the latest "license-free" version to fix vulnerabilities: C3560CX-12pd-S C3650-48PS-E C3850-12S-E C3850-24T-E C3850-12S I didn't find any ...
khatabakhshnadia's user avatar
0 votes
1 answer
224 views

dot1q L3 router sub-interfaces and L2 switch ports

I have a router with multiple L3 sub-interfaces. On the other side I have a L3 switch (Nexus 9K) that I'd like to have multiple hosts that are on the switch route their traffic to one of the router ...
Terry Grace's user avatar
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291 views

Cisco nexus 9336-FX2 ETHPORT-5-IF_DOWN_LINK_FAILURE

I am seeing following error on 100G interface. (SFP bought from fs.com) nxos version 9.3.10 2023 Oct 11 00:41:12 spine-1 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/4 is down (Link failure) ...
Satish's user avatar
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Layer 3 switch SVI and static ip confusion

I have not configured the network yet. Every vlan will have a different subnet. I want to assign ip addresses to the switches on the network from another subnet. How can i provide a default gateway ...
shiva13's user avatar
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2 answers
67 views

How do you assign sequential IP addresses to individual ports on a switch? [duplicate]

I am looking for a non-complicated way to set up a network of 50 interchangeable devices such that whenever I plug a device into a specific port on a switch, I will always get the same IP address ...
Curtis's user avatar
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1 answer
93 views

Layer 3 Switch IP Problem on Packet Tracer

I set up a network. It contains vlans. I assigned devices ip addresses from different subnets. I have 2 layer 3 switches to communicate them. I assigned switches ip addresses from different subnet. I ...
shiva13's user avatar
1 vote
2 answers
172 views

Inter-VLAN using L3 switch

There are 3 VLANs 10, 20 and 30 on these switchs. Everything such as VTP, DTP are working fine. The problem is that inter-VLAN seems not to work correctly. IP routing is activated on the L3SW (even ...
Gekko's user avatar
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1 answer
145 views

How do layer 2 switches route based on MAC when daisy-chained?

Trying to think about this from a hardware design perspective, if I had to design an FPGA or a uC or something to manage a single port being the gateway port and one or more switched ports for routing,...
Qix - MONICA WAS MISTREATED's user avatar
0 votes
2 answers
34 views

RMA'ed device configuration [closed]

Just wondering what are the methods that you use when re-configuring an RMA'ed device. Do you manually configured all the script that runs on the device or is there any efficient ways configuring the ...
dlareg28's user avatar
0 votes
2 answers
169 views

Can wrong SFP module damage equipment?

SFP modules convert electrical data from the equipment to optical signals. There is no incoming power surging from an optical port to damage the equipment according to my undarstanding of fibre optics....
SandShriner's user avatar
1 vote
2 answers
399 views

Brocade 7450 - set MTU to 9000

I have brocade icx 7450. I already enabled jumbo frames to increase MTU packets on switch. But unfortunately I am not able to change MTU size of port which I want. When typing after choosing interface ...
Frihu's user avatar
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2 votes
3 answers
436 views

Switches in chain topology for ~40 devices

I am currently looking at a network topology consisting of ~40 DUTs. In this network, there is no hierarchy (like access core and distribution), and all the switches are connected in chain topology. ...
user1397215's user avatar
0 votes
2 answers
139 views

Can we have two logging source-interface configured on Cisco Switch?

I would like to understand if its possible for us to have two logging source-interface configured on Cisco Switch: logging source-interface vlan1 (For syslogs) logging source-interface vlan2 (For ...
Blake's user avatar
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1 answer
71 views

Switch Configuration - Change the trunk allow VLAN

May i know any service interruption if i issue the command on changing the trunk allowed vlan on both end: switchport trunk allowed vlan 10, 20, 30 to switchport trunk allow vlan 10, 20, 30, 40
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