a device that bridges network segments, operating at the OSI link layer level.

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3
votes
1answer
260 views

DNS settings on managed switches in LAN

We have a Windows 2008 server that is connected to a managed switch with about 15 Cat5e connections and three fiber branches that go to different parts of campus. At each of these parts there is ...
2
votes
1answer
2k views

Cisco Catalyst 3750 disable Factory default reset with Button press

The Catalyst 3750 Series switch has a front panel button which erases the config and reboots the switch if pressed more than 10 seconds. In a dense Rack it happened more than once to me that cables ...
0
votes
1answer
100 views

Can a faulty switch connected to the core switch block an entire network?

I encountered the following situation: The network I administer was blocked, and this was traced down to a specific rack, after I reseted both switches, everything worked. I supposed it was the core ...
0
votes
2answers
777 views

Interconnecting a fiber optic switch with a copper switch

What would be the best way to connect from a "fiber optic only" switch to a regular copper rj45 switch? Which of the configurations shown in the attached diagram would work properly? Should I go for a ...
1
vote
1answer
820 views

OpenWRT router as a switch with DNS

We have a router (8 ports) that serves our church (it also is our modem with ADSL2 etc) and handles our DHCP services. I've needed to extend our network to accomodate another 2 ports, so an extra ...
0
votes
1answer
68 views

How many times does switch calculates FCS?

Does a switch calculate the Frame check sequence (FCS) before sending packets? Because packet shouldn't change, so FCS should also stay the same.
0
votes
0answers
143 views

Switch troubles - Cisco Catalyst 2950T 24

At my new workplace, thanks to the old system administrator, we have an unused Cisco Catalyst 2950T 24 (two gigabit ports, 24 100Mbit ports). It was used in a quite weird setup (the place has two ...
-5
votes
1answer
42 views

Backplane of a switch [closed]

How to practically find the back plane capacity of any Ethernet switch ? Also how to calculate the maximum TX and Rx load on trunk port of switch . And calculation of memory and processor utilization ...
0
votes
1answer
291 views

2x uplinks in HSRP - how to setup switch?

Our ISP provides us with 2x 10G uplinks, and they use HSRP on their end. We see incoming traffic (load balanced) on both ports, but outgoing from us is only via one port. We only run L2 on our side (...
1
vote
1answer
487 views

SFP+ Cable From Uplink Port to SFP+ 10Gb NIC

I have a specific question about using a this 2m passive SFP+ cable to connect the 10Gb uplink port on a switch to a NIC in a server. Switch: Netgear GS752TXS Server NIC: HP NC522SFP I'm fairly ...
-5
votes
1answer
233 views

How do I connect a router on one LAN port to another router on another LAN port on the same switch? [closed]

I have the following setup: For non-technical reasons, I am unable to change the physical setup of the devices. What I'd like to do is have router 2 (a wireless router) act as a wireless AP that ...
-3
votes
1answer
68 views

What type of switch should I get to implement a site with around 140 desktop machines, plus around 20 SIP phones? [closed]

We're moving to a new office and we will be needing to setup a network closet. I'm estimating that we will have around 140 ethernet ports and will be using CAT6a cabling for 1Gbps connections. I'm ...
-1
votes
1answer
495 views

3 NICs in VMware ESX 5.5.0 cannot connect to each other [closed]

I have a Vmware ESXi 5.5.0 hypervisor, installed on a desktop pc with 3 physical NICs. The first NIC is connected to the internet (WAN), the 2nd and 3rd NICs have Access Points installed (plugged in) ...
3
votes
2answers
344 views

Can PoE kill unmanaged switches?

Two simple unmanaged switches have died in the same cabinet in two years, one at 18 months and one just today at six months. Both times we gradually experienced increasing intermittent verified ...
0
votes
2answers
41 views

Does all Layer 3 capable switches able to do Layer 2?

I was tasked to find an affordable Layer 2 Switch around our area but can't seem to find one... in fact I found a Layer 3 Switch that seems to be cheaper than the Layer 2 i came across somewhere. I ...
-1
votes
1answer
920 views

Allow Internet access across vlan [closed]

this is my lab: I have the switch netgear gs724tv4, I have a modem router for Internet access with dhcp that can lease only 5 ip addresses. The ip subnet for the modem router is 192.168.1.0/24 I ...
1
vote
1answer
625 views

Is it possible to bridge/join two or more vritual (Hyper-V) switches with the same address range over VPN?

I have several Hyper-V servers which are not in the same LAN. On every server are several Hyper-V guest VMs which are connected via an internal virtual switch. Now I want to to connect these two ...
0
votes
1answer
2k views

How to implement a network fault tolerance on a Windows Server 2008 R2, Single Server - Dual NIC? Only Windows Services like DNS, DHCP, File Server

Diagram 1: Server, VIP IP Address, Network connections, Switches and Clients Hello There! We have an IBM x3650 M3, Dual NIC. We have Windows Server 2008 R2. In this Window we will have services ...
2
votes
1answer
115 views

VLAN routing query on HP Switch

I have Layer 3 HP switches throughout my organisation. They are set up to perform routing between all the VLANs connected to them, and everything is working. I am pretty proficient with using them, ...
0
votes
0answers
72 views

Network access sometimes lost, disabling port security temporary solves?

I have network based primarily on Edge-Core managed switched. Port security with max mac count = 1 is enabled, DHCP snoopping enabled. Some clients have troubles with accesing network, but when I ...
0
votes
2answers
542 views

How can I use SSH to run Cisco IOS commands in Global config mode?

I know about Kron, but there is supposedly no way to run global config commands: http://www.techrepublic.com/article/schedule-commands-with-cisco-ios-kron/ If I connect using Putty, Putty is able to ...
1
vote
1answer
419 views

Connect access switches to router or core switch

My workplace consists of 4 access unmanaged network switches from three different computer rooms connected to a router. The router contains three 100mbps ethernet ports and one Gigabit (GigE) port. ...
2
votes
1answer
707 views

Operational State Down on QLogic Switch

I have a QLogic SANbox 5800 Fibre Channel Switch with 20 SFP ports. Out of these 20, I can use only 16. The last 4 ports are showing Operational State Down. SANbox (admin) #> show port ...
2
votes
0answers
894 views

Cisco SG300 switch does not send RADIUS messages to server for 802.1x

I want to eventually configure the SG300 to authenticate wired clients with 802.1x and Microsoft NPS (RADIUS). I am currently testing this setup using a single port (Port 7) on my SG300, a test ...
1
vote
1answer
185 views

VLAN routing to internet

I am currently setting up a new network and wanted to make sure it is being done in the best way as this is my first time working on a NetVanta 1234P and I am having issues with routing The client I ...
2
votes
3answers
2k views

VLAN planning and questions

I currently manage an environment with IP addressing of 10.10.10.x/23. We have 3 VLANS set up, and I use that term very loosely. The reason I say I use the term loosely is, the 3 VLANS have full ...
-6
votes
2answers
370 views

How to reset HP small managed desktop switch? [closed]

I've got a 8-port J9079A managed switch here that I was using. Unfortunately, while configuring, I must have clicked the wrong option as I lost all access to/through it. I was doing my VLAN setup, ...
4
votes
1answer
166 views

Massive packet duplication

Short Version: We've had a problem with a particular server receiving massive duplicates of packets. After much fault finding we found the problem was caused by a switch sending my packet out every ...
1
vote
0answers
278 views

HP 5120 vlan not working

So I have this odd issue with our HP 5120 switches. The VLANs will not pass traffic unless a interface with a IP is assigned to the VLAN. Problem is there is a limit of 8 VLAN interfaces that are ...
0
votes
0answers
251 views

Cisco 3560-X and Bind9 DDNS integration

Experts, In an infrastructure I'm currently working on, we have one Cisco 3560-X as a core switch and an internal Bind9 DNS server. The 3560 is acting as the DHCP server. BIND9 currently has names of ...
1
vote
2answers
3k views

HP 2510G Loop Protect doesn't work

I have a problem with Loop-Protect on a HP 2510G Switch. I configured Loop-Protect with loop-protect all receiver-action send-disable and set transmit-interval 1 and disable-timer 30. I tested my ...
-1
votes
1answer
105 views

Cisco - what is the purpose of a gigabit ethernet switching module

Cisco noob here Recetly while looking for a cisco switch and router combination for my CCNA studies i won this bid for a (I added the bid to keep track of it and i ended up winning it) Cisco-4500-...
1
vote
1answer
503 views

Cisco Catalyst 3560 PoE 48 with setting interface to auto qos voip trust

All I'm trying to do is copy the running-config from a Cisco Catalyst 2560 PoE 24, to a Catalyst 3560 PoE 48. This is f0/1 from the original switch: interface FastEthernet0/1 switchport access vlan ...
-2
votes
1answer
100 views

Is HP-2920-24g switch compatible with CHEF setup? [closed]

I am using HP 2920-24G switch. In that,I am trying to build the setup for CHEF Client. But it shows error while bootstrapping. Is that HP switch supports CHEF or not?
2
votes
1answer
256 views

Is there a standard managed switch configuration protocol?

is there a vendor-independend managed switch configuration protocol e.g. for creating VLANs that can be run over TCP or serial port?
0
votes
1answer
118 views

Network flow path using spanning tree protocol

I have two machines, A and B, connected via switch S1(master) and s2(slave). I want to measure latency and identify packet flow path from machine A to Switch,switch to machine B. If the link between ...
3
votes
2answers
1k views

HP ProCurve 5406zl does not accept direct attach cable with error “Not an HP Networking transceiver”

I have an HP 5406zl switch running the latest firmware in the non-early release branch (K.15.14.0007, ROM K.15.30) and it is not accepting direct attach SFP+ cables in its SFP+ module. The module is a ...
1
vote
0answers
55 views

Measuring latency with switch and identifying flow path

I have two machines, A and B, connected via switch S1(master) and s2(slave). I want to measure latency and identify packet flow path from machine A to Switch,switch to machine B. If the link between ...
-1
votes
1answer
86 views

What is the difference between an accelerated LAN port and a regular non-accelerated port? [closed]

Can someone explain the difference for me? Wondering more about the difference for the end user, but a technical description would also be helpful.
2
votes
2answers
1k views

Cannot disable mac restriction on port for HP Procurve 2626

I have a HP Procurve 2626 as the main trunk for several subnets in production. I am a UNIX systems administrator and not a networking guy, but I've worked with cisco switches and some of these HP ...
-2
votes
1answer
154 views

ethernet switch makes network down [closed]

I have a D-Link 8-port Ethernet switch which was perfectly working. Since 2 days ago it makes the entire network down. The problem is when I disconnect the cables it runs again and after I connect "...
2
votes
2answers
247 views

What drawbacks does VTP pruning pose?

I'm currently learning a bit about Cisco switch configuration and VLAN configuration, specifically VTP. Reading on Cisco's site, the feature of VLAN pruning appears to not be used on a switch/VTP ...
1
vote
2answers
168 views

NTP Server in Network Switch

Is it possible to set up a Switch to acts an NTP Server for the devices connected to its VLAN ? If so ,how can I implement it my HP Switch A3600 JG299A. I want to do this because I do not have ...
2
votes
1answer
179 views

Production servers can suddenly not access the internet anymore

Problem All Production Servers were suddenly not able to access the internet anymore, while four other Servers connected to the same VLAN and same eth0 settings can. Figure 1: System 1 represents ...
1
vote
2answers
192 views

simple setting for traffic shaping

I have: 2 linux boxes (A, B) 1 switch (S) 1 gateway (G) [I have no control over this one] +---------------+ | switch S +-------+ +---+--------+--+ | | | ...
1
vote
0answers
457 views

DRAYTEK - VLANs with VLAN tagging switches / router

Our company uses Draytek routers (various models, slowly upgrading to 2860n at each site). We have recently purchased a new site, and want to split the network up into separate VLANs, so as to ...
2
votes
1answer
128 views

Cisco switch, white residue in switch ports

I have 2 cisco small business switches, unknown age and provenance, both have developed a white residue on some of the switch ports as below image: Any ideas what causes this? It looks a little ...
-1
votes
3answers
100 views

3x networks, hardware in 2 locations, 1 connection to join them

Sorry it was hard to think of a title for this, so hopefully I can explain my situation. We have hardware (unix servers) on 3 different network subnets. For example: 10.44.1.0 10.44.2.0 10.44.3.0 ...
3
votes
2answers
1k views

What does 'Si' mean with respect to network switches?

I am seeing references to Multilayer Switches with Si as in the network symbol below. What does the 'with Si' qualifier mean?
1
vote
1answer
842 views

Setting Up VLAN on Dell Switches

I need to create a vlan on a dell switch. I'm brand new to vlans, and have a few simple questions. I have the MAC addresses for devices that are plugged into the switch, how can I figure out which ...