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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.

0
votes
1answer
22 views

1 switch handling several servers or several switches handling a server each?

Which of those two approaches are better for a more stable network? I was thinking 1 switch handling several servers so that other switches are able to handle other devices such as a desktop PC or ...
1
vote
0answers
21 views

Why Korenix Switches hang up SSH so often? [on hold]

Does anybody know, why Korenix Switches hang up SSH so often? And then, you have to restart the switch each time, that happen. On HP Switch there is no problem with that SSH. If anyone has any ...
0
votes
0answers
11 views

Can't Find Latest Firmware for CiscoLinksys SLM2048 Switch [on hold]

How can I get get the latest firmware on a obsolete Cisco switch? Specifically, even though the CiscoLinksys SLM2048 is retired equipment, I have one that still works well, and I'd like to install ...
3
votes
1answer
19 views

SG3xx Password Reset/Recovery

Trying to reset a password for a number of switches I have. Didn't save the text file I had jotted it down in....of course. Connected via serial, but cannot seem to locate any concise info on ...
4
votes
1answer
9k views

Difference between Linux Bridge and Open vSwitch

What are the most significant differences between how a Linux bridge and an Open vSwitch work?
2
votes
1answer
47 views

Same Vlan Name / ID on different switches network subnet same or different?

I have several switches (some on same floor and another on other floors) all connected to core layer 3 switches through trunk links. One of the vlan id / name is repeated along the switches. May I ...
-2
votes
2answers
57 views

is it ideal for a network that abandon the use of L2 switch?

I'm thinking about minimizing network hardware while optimizing network topology for company. If a company has unlimited(or very high) budget to build an ideal network for internal use(traditional ...
0
votes
1answer
37 views

Cisco nexus 9396PX TX output discard on 40G interface without link congestion

We have cisco nexus 9396PX with N9K-M12PQ module (12x40G Interface), We have 8x10G L3 LACP bonded connectivity with our ISP and so far so good no issue at all. but recently we migrated that LACP LAg ...
6
votes
1answer
1k views

Cisco 3750X Power Cable

I received a Cisco 3750X the other day. I went to go plug it in for testing and found that the standard three prong female power connector is no longer compatible with the power supply. Cisco has ...
0
votes
1answer
89 views

Switch cannot ping server

My switch won't ping my server. Both are directly connected with each other, and are in vlan 666. When I initiate a ping from my switch to my server, the switch sends ARP requests. Then the server ...
0
votes
0answers
9 views

Multiple DHCP servers detected by access points [closed]

I’m having an issue with our internal network and voip network. I currently have it setup as a non-converged network separating our two data switches and one voip switch. We preferred not having our ...
0
votes
0answers
21 views

Is this setup possible. Multipler user PC's & KVM. 1 Shared PC - Switch [closed]

I'm not in an IT role or an engineer. In fact i'm usually just on the coding, excel & share point site. However I do have a requirement that i want to check is possible as it seems to have been ...
13
votes
2answers
14k views

STP blocking port selection

I want to make sure I'm understanding how this works. Specifically the term "Sending Port ID" has me very confused. Consider this diagram, I want to make sure I have root port selection figured out: ...
5
votes
2answers
46 views

What's the `line protocol` and `Link`?

When I show a switch interface information, there are line protocol and Link: Switch-A(config-if)# show interface gigabitethernet 0/3 Gi0/3 up, line protocol is up (connected) Bridge Port Type: ...
2
votes
1answer
58 views

Do unmanaged switches honour QoS priorities set by managed switches?

Details about the devices We have a 24 port NETGEAR managed POE switch that has QoS capabilities. We also have the following unmanaged switches, 24 port Cisco POE, 48 port Cisco, 48 port NETGEAR, ...
-1
votes
0answers
13 views

Cisco Packet Tracer - How do I connect these networks through a router? [closed]

I am trying to connect these two switches through the router as shown and also correctly configure the wireless router on each network so that they connect to their switch. Basically anywhere there's ...
3
votes
2answers
33 views

Firmware Compatibility with 15.x IOS versions

I have a Cisco switch stack with both PoE and non-PoE switches as members. Is there any compatibility issues with the firmware version 15.0.2-SE11 between the following devices? 1x Cisco WS-C3750G-...
1
vote
0answers
20 views

How can I filter the exact interface in huawei switch?

How can I filter the exact interface in huawei switch? you see when I use the include GigabitEthernet0/0/1 to filter, there will get many GigabitEthernet0/0/1* interfaces: <Z178A>dis ...
7
votes
2answers
429 views

OSPF increase bandwidth with load-balancing

This is my current setup where i have 40Gbps links between all 4 switches running OSPF using L3 links between them but now i want to double my bandwidth between switches so i am planning to add (...
4
votes
1answer
381 views

Why would a switch ever send an ARP request for a MAC address when it can just wait for the first packet to be received from a device?

I've been reading 'Windows Networking Fundamentals' and in that book it says that a switch can learn what MAC address is associated with a particular port when the connected device makes its first ...
0
votes
1answer
70 views

Is there a MTBF related to port linking?

During a firmware upgrade, I've noticed one problem: An equipment keeps linking/unlinking on a specific port of a PowerConnect 3548(stp portfast, switchport access mode). I've contacted the local ...
1
vote
1answer
112 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? ...
3
votes
0answers
35 views

Cisco nexus 9396 rebooted with reason xbar_client

Today my one of cisco nexus 9396PX switch got rebooted and this is what i found, based on following logs what could be wrong? We don't have Cisco support for this switch, trying to see if i can get ...
2
votes
1answer
18 views

Shoretel ST1D Switch not accepting assigned IP

After configuring a Shortel ST1D switch, I connected the LAN1 Port from Shoretel ST1D to my Cisco 4507R switch. I attempted to ping the IP that I set specifically on the ST1D switch and I wasn't able ...
1
vote
0answers
35 views

Cisco nexus spanning-tree logging to syslog

I am trying to send my spanning-tree events to remote syslog but somehow it doesn't work, This is what i have in my config. N3K# sh run | grep logg logging level spanning-tree 7 logging server 172.29....
3
votes
1answer
148 views

Strange flooding during installing new switch in network

This is very strange issue i am noticing. In our datacenter we have every switch in rack has cisco vPC configured in short whole datacenter running vPC so there is no loop for spanning-tree anywhere ...
2
votes
1answer
57 views

spanning-tree port type edge trunk on port-channel vs physical interface

If i configure spanning-tree port type edge trunk on physical interface instead of port-channel does that work? Or i have to do spanning-tree port type edge trunk on port-channel ? Example: ...
0
votes
1answer
78 views

Does vPC peer-gateway cause unicast flooding

This is my network topology where I have SW-1 is configured for HSRP for multiple VLANs, SW-2 & SW-3 connected to SW-1 using vPC. Last few month I am dealing with this unicast flooding where ...
1
vote
1answer
157 views

Flooding vs Unknown Unicast Flooding

Can someone clarify what is the difference between Flooding and Unknown Unicast Flooding? Is it the same thing or it contains different meaning? I'm aware that Flooding happens when a switch ...
1
vote
1answer
19 views

Cisco swtich stacked NTP configure

I have two cisco switches (WS-C3850-12XS-E) stacked by stack cable. I want to configure ntp on them. How to configure ntp on those about time synchronization?
3
votes
3answers
2k views

Cabling standard for Layer-3 switch

I want to know the appropriate cable type between: Layer-2 and Layer-3 switch Layer-3 switch and router Is it cross-over or straight through?
1
vote
1answer
49 views

No MAC address table shown on Cisco switch

I'm studying CCNA1. following netacad course notes and sending "show mac address-table" to a switch (in packet tracer) I should get a list of the available MAC addresses. I only get the table header ...
3
votes
3answers
384 views

Collision domain question

I'm studying for my CCENT exam, and not quite sure why the book (official Cisco) says that there are 5 collision domains in this example. Isn't it supposed to be 4? The hub on the left, the hub in the ...
1
vote
1answer
40 views

Can't install OS on S6000-ON

I have a Dell Networking S6000-ON. I'm trying to install an OS with ONIE but am running into an issue with the EEROM TLV info. Using some of the onie-syseeprom commands came back with this: ONIE-...
2
votes
2answers
232 views

Cisco CoreSwitch 6509 Vlan connection problems

just wanted to ask what measures I'll have to do regarding on my problem on CoreSwitch 6509. I have 12 vlans on layer 3 switch which has 48 ports, 4 ports per vlan and I have a backbone on vlan 10 and ...
2
votes
1answer
65 views

VTP does not update VLANs in switch

Switch 1 will be server and Switch 4 will be Client! Switch 1 configuration S1#show run Building configuration... Current configuration : 1451 bytes ! version 16.3.2 no service ...
1
vote
1answer
51 views

Configure Nexus N9K-C93180YC-EX

I am configuring a switch for the 1st time (Cisco Nexus N9000 Switch) to do some server performance testing in my lab. I have the serial console working and can log into the switch and run commands. ...
0
votes
0answers
10 views

Managed / Unmanaged Switch [duplicate]

This is a basic question, But can someone clearly state what is the difference between managed and unmanaged switch? Also, do managed switches maintain their own routing table?
1
vote
1answer
43 views

Connecting networks from different states [closed]

Is it possible to connect 5 networks together using one router as a central component even if the networks aren't close to each other? An example would be 2 networks in Houston and 1 in Dallas Texas, ...
6
votes
6answers
1k views

Do I need to protect SFP ports and optics from dust/contaminants? If so, how?

I have a used switch with some SFP ports and some SFP modules installed, which I don't use. All new switches come with little rubbery bungs that block up unused SFP ports, but since this old procurve ...
10
votes
4answers
15k views

Two hosts of different subnets connected to switch

Two host of different subnets, let it be A - 10.1.2.1/24 and B - 10.1.3.1/24 be connect to the same switch S. Can they communicate? So as far I understand: A sends a packets with IP of B S receives ...
5
votes
1answer
46 views

Non-HP transceiver and HP switch

Does a non-HP single-mode transceiver work in a HP switch, and does a non-HP single-mode transceiver communicate with a single-mode HP transceiver?
2
votes
2answers
76 views

Obtaining packet switch-port information via a mirrored port?

When sampling a mirrored port of a switch, is there any means of determining the switch-port information of the packet? Since Ethernet packets do not contain this information, I assume the answer is ...
1
vote
1answer
2k views

Beginners Guide to VLAN with Netgear & Ubiquiti HW VLAN101?

I've got a few questions related to networking, more specifically VLAN'ing. I've got a Gateway/Router - Ubiquiti USG I've got a 48Port Netgear Switch - Netgear GS748Tv5 L2+/L3 Lite I've got 5 ...
2
votes
1answer
181 views

Configuring multiple subnets with switch connected to single router interface

I have a design like this But I'm receiving a lot of mismatch errors and it doesn't work at all. I tried to ping 10.0.0.1 to no avail. I'm trying to configure the vlans on the switch 1 this way (...
11
votes
6answers
187k views

Finding Non-Cisco End Device IP Addresses Connected to Cisco Switch

I have Cisco catalyst switch, with many VLANs and address ranges. How do I find IP addresses connected to the switch that are not Cisco devices?
9
votes
4answers
2k views

Measuring per-link latency/jitter/packet-loss

I need to measure the latency, jitter and packet-loss per link in a network, as opposed to end-to-end, e.g. like this: s1-eth0 <--> s2-eth0 (~ 20µs avg. latency, standard derivation 10µs, 57 % ...
2
votes
1answer
64 views

Duplex mismatch between a Fast Ethernet router and Gigabit Ethernet switch with auto negotiation

i am connecting c3745 router on fast ethernet 0/0 interface with a IOSvL2 switch on gigabit ethernet 0/1 on GNS3. i have set the negotiation on the switch to auto for all interfaces on the switch. ...
5
votes
2answers
3k views

Does a switch MAC address table sync across all switches in the same VLAN?

Ok, I have read up about this 16K limit for the MAC address table, or better known as the CAM table, on certain switches. Lets say I have 14 different edge switches with that 16K limit, and I have ...
22
votes
8answers
4k views

Why can't devices on different VLANs, but on the same subnet, communicate?

I have a question about switching. I have two devices connected to a switch with IP addresses 192.168.5.20 and 192.168.5.10. Both devices have the same prefix, /24. That means they are on the same ...