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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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Connect PC to HVAC Router

I have a network with multiple Cisco 9300 Switches and 9606 Core switches. We had a PC connected directly to a Carrier i-Vu XT Router. The PC needs to be moved to another building. I connected the ...
1 vote
2 answers
138 views

STP TCN at root port role change

I am facing a situation in our work topology, and I will try to simplify the question as much as possible. I have this non-root switch (SW1) that has two ports connected to separate switches in a ...
0 votes
4 answers
2k views

Communication between different VLANs

In my previous understanding, there is no way to communicate between two VLANs using only layer 2. After all, this is the purpose of having VLAN. I found a forum that claims the following. 1.VLANs can ...
0 votes
2 answers
542 views

Managed Switch, Setting up VLAN Tagged, Untagged, allowed & tagged only etc

Looking for some help setting up a Dell PowerConnect 2724. 1st time setting one of these up. The best graphic I could find to explain my setup: My router DHCP is enabled so it will provide IP ...
0 votes
0 answers
15 views

How is the packet processed in switch/router? [closed]

The architexture I believe is used (could be very wrong so please correct if incorrect) Packet comes in the interface and queued in the input buffer of that interface then according to the scheduler ...
6 votes
2 answers
370 views

Why FastEthernet STP Link is Selected over EtherChannel?

What are the possible reasons why STP would choose to use a FastEthernet link over an EtherChannel? Below is a network diagram where this is happening.
0 votes
1 answer
73 views

Struggling to configure VLAN properly (LANCOM, no internet)

I'm currently trying to configure several port-based VLANs for guest rooms, but I'm either not getting any network connection or no internet access depending on what I configure. There are several ...
1 vote
1 answer
6k views

J9450A HP 1810-24G Switch firmware upgrade

I'm trying to upgrade the firmware on my J9450A HP 1810-24G Switch, which presently has firmware P.1.6, eCos-2.0 The firmware-update-for-an-1810 question is out there on the internet, but the ...
1 vote
1 answer
67 views

Help with using multiple ips from one port of router and accessing a website from those

In our institution ISP provided us with a modem with only 1 working port. But 5 ips can be accessed using that port by directly plugging in network cable to a pc. Our organization's website only ...
1 vote
1 answer
422 views

How FDB (Filtering Database) is filled out

I would like to understand what is used as a VLAN column in the FDB. For ACCESS port it is PVID if frame untagged or frame VID if frame is tagged, for TRUNK it is allowed VLANs? We can represent the ...
0 votes
1 answer
954 views

HP ProCurve Switch 4100 series - Checking PSU status & S/N from the CLI

Do you know if there is any CLI command available on the very old HPE Procurve 4108gl/J4865A switches where you can see how many PSUs are installed in the chassis, what's their current status and ...
0 votes
2 answers
120 views

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.
1 vote
1 answer
524 views

How to block telnet access for one particular network from all networks except one using Extended ACL

Scenerio is given in the picture. I want to block all the networks except 192.168.5.128/25 from doing telnet of 192.168.5.0/25.
1 vote
1 answer
309 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 ...
0 votes
2 answers
632 views

Bash script to gather serial numbers from list of cisco switches

I have pieced together a script to login to each switch listed in the file switch.txt, grab the serial number and place it with the IP address into the CSV serials.csv. The problem I am having is that ...
0 votes
0 answers
42 views

Configuring VLAN Trunk on JunOS

I have a Juniper EX-4300-48P and I was trying to test out connecting it to a TP-LINK TL-SG108E and the intended network flow is as follows: EX-4300-48P Interface ge-0/0/0 set to trunk VLAN 121,125,126 ...
0 votes
1 answer
64 views

How to run 'show run' and enter 'conf t' without password via remote SSH

I have a Cisco Catalyst 4500 L3 Switch and have a user called user1. Switch IP is 192.168.1.1. I have a server which IP is 192.168.2.1. I created a user in my switch and I can SSH into my switch ...
0 votes
2 answers
63 views

Cisco switch running multiple commands at once via remote server

I have a Cisco Catalyst 4500 L3 Switch and have a user called user1. Switch IP is 192.168.1.1. I have a server which IP is 192.168.2.1. I created a user in my switch and I can SSH into my switch ...
0 votes
2 answers
216 views

How to get all the device information between two devices

I've two devices: My-PC and Another-PC. The two devices are connected to a switch, which is connected to main switch with-in the same LAN. My question is: how do I get all the device information ...
0 votes
1 answer
996 views

Configuration recovery on Extreme Networks Summit 200

I need to upgrade a small network I know nothing about. The only manageable switch in an Extreme Networks Summit 200, running ExtremeWare 7.3 (from 2005!). Of course, the default admin password has ...
0 votes
1 answer
53 views

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....
2 votes
1 answer
157 views

6125XLG blade switch IRF configuration in c7000 chassis

I have HPE c7000 chassis with 612XLG switches. I am trying to setup IRF between blades switches. somehow i am not able to bring up irf-port interface. In 6125XGL TE1/0/17-20 ports are internal ...
1 vote
1 answer
65 views

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 ...
0 votes
1 answer
445 views

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 ...
2 votes
3 answers
77 views

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 ...
1 vote
1 answer
51 views

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 ...
6 votes
3 answers
680 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 ...
0 votes
1 answer
747 views

Duplicated Vlan ID

I have one flat network with our data center and it is causing as a lot of issues, so i had to design a new network to separate the buildings from the data center, when I designed the new network i ...
7 votes
1 answer
6k views

Why is routing not working on my Dell N2048 switch

I am in the process of replacing some older Dell Powerconnect switches with a some Dell N2048 switches. While doing this I wanted to go ahead and segregate certain areas of my network using VLANs. ...
0 votes
1 answer
279 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 ...
0 votes
2 answers
56 views

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 ...
3 votes
2 answers
315 views

Colocation Rack Networking

I'm a sysadmin tasked with finding a managed service provider or networking contractor to build out our new colo space networking. I'm hoping to get some input to make sure I don't sound like an idiot ...
1 vote
1 answer
38 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 ...
-1 votes
1 answer
25 views

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 ...
0 votes
1 answer
42 views

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 ...
0 votes
1 answer
92 views

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 ...
0 votes
1 answer
1k 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 ...
1 vote
1 answer
71 views

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 ...
0 votes
1 answer
242 views

Can anyone explain the introduction of Rapid Dual Homing to me?what is the main function of rapid dual homing?

I read some information about Rapid Dual Homing from JetNet 5020G,the figure below is the introduction of Rapid Dual Homing. Honestly,i don't understand why can the rapid dual homing have multiple ...
0 votes
3 answers
208 views

Direct connection slower than via switch

My office ISP provides a 1 GBPS connection. When I connect my laptop directly to the router provided by the ISP, and connect to fast.com, I get a speed of approximately 100 mbps. Our office network is ...
1 vote
2 answers
77 views

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 ...
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 ...
2 votes
2 answers
5k views

Managing multiple internet connections to a single switch

We have 2 internet connections coming in to our building - neither are great (2 different routers from different providers). Are there technologies in Network Switches to support active switching or ...
0 votes
1 answer
75 views

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 ...
6 votes
4 answers
19k views

Toggle Switch for an Ethernet Cable

Is it possible to place a switch in one of the four/five wires of an Ethernet cable that will disable it? For my hardware project I would like the user to be able to disable the internet connection at ...
-1 votes
2 answers
62 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 ...
0 votes
1 answer
119 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 ...
0 votes
1 answer
81 views

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 ...
2 votes
1 answer
205 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 ...
0 votes
0 answers
72 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 ...

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