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0
votes
1answer
38 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 ...
-5
votes
1answer
29 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
0answers
29 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 ...
-6
votes
2answers
54 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, ...
-1
votes
1answer
82 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) ...
0
votes
0answers
32 views

STP/RSTP: what switch should do with MAC table on a port after changing STP role of this port?

I have two switches and two active links between them. Spanning Tree Protocol is enabled on both devices, and port roles are assigned correctly: there are two Designated/Forwarding ports on RootSwitch ...
3
votes
2answers
333 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?
5
votes
3answers
618 views

Gigabit uplink versus regular switch port

I have a 10/100/1000 24-port + 2 mini-GBIC ports switch which I have to link to other switches. Unfortunately, on the other switch all the mini-GBIC slots are taken up, so all I can do is link them ...
0
votes
1answer
630 views

Increase Network Bandwidth on Windows Server 2008 R2

I am looking after this network with around 40 clients on one Windows 2008 R2 server. These clients are connected to server via two gigabit switches (24-port dumb switches). Over the next few months ...
1
vote
1answer
58 views

If I connect an interface which is not set up in operation system to a switch, should the link LED light up?

Patch-cords are checked with a tester and they are OK. LEDs are not burning neither on switch ports, nor on the blades' interfaces. Interfaces on blades are NOT set up, so the question is: should they ...
0
votes
0answers
13 views

consentry network switch removing security

I have a few old 'consentry network switches' that I can access the console on easily as they are at factory defaults. I want to be able to disable the lanshield security so any device can be plugged ...
0
votes
1answer
243 views

cascading load on connected Alcatel-Lucent OmniSwitch units via VLANs

We are having an intermittent issue with a campus of Alcatel-Lucent Omniswitch switches, ranging from model 6000 to 6850. We are having a problem tracking down the root cause of our issue. The seems ...
-4
votes
4answers
89 views

Same static IP addresses to single static IP address communication [closed]

I have a server with 4 modules, and one Ethernet Port and an internal hub to assign these modules to, configured as below. Module 1: 192.168.10.1 Module 2: 192.168.10.2 Module 3: 192.168.10.3 ...
0
votes
3answers
116 views

is this network structure viable?

I would like to know if this network structure it would be viable or not. The main reason it would be to be able to switch manually, the ISP. If one is going down than use the other one. as I know ...
2
votes
2answers
358 views

Any standard protocol to find all systems' MAC addresses and possible hostname connected to a switch

I have servers and storage arrays in a composite lab and intermediate switches. I want to get a list of all the MAC addresses of the systems connected to each switch. It should be switch vendor ...
7
votes
1answer
691 views

Are network switch data transfer speed limits per port or per device?

Sorry in advance for the newbie question! When network switches report speeds of say 100 Mbit or 1 Gbit, are they referring to the maximum speed per Ethernet port or is this the physical limit of the ...
2
votes
3answers
113 views

Network Switch for Web Application

I'm migrating a web application from a single server to a three server config, two running the database and one the web tier. I need to purchase a network switch to string these servers together ...
4
votes
2answers
106 views

Appropriate Network switch for small server cluster

Need to build a small business server cluster for the purpose of crunching data. It will not host a web site that needs to be available 24/7. It does need to support servers that host Redis, a ...
16
votes
3answers
3k views

Connecting two desktop switches with more than one cable?

I was hoping to find a way to increase bandwidth between two desktop switches I have, and I wondered if connecting them with two cables (or perhaps three) instead of just one might increase ...
0
votes
1answer
65 views

How to build a L2 Ethernet with 1000 comupters?

We don't really have 1000 computers. I'm asking this question just because my brain is blocked here. If I put a number of, say 1000, computer on a L2 Ethernet. Since most of L2 switch has only maybe ...
0
votes
1answer
50 views

How to determine remote link speed?

I'm on a non-manageable switched 1 GbE network with mixed 100 MbE and 1 GbE hosts. Is it possible to tell if a certain host has a certain link speed without looking at the status LEDs of the switch ...
1
vote
0answers
181 views

Tool to parse Dell PowerConnect switch configs to make them more readable and diff friendly

I've been working with many Dell PowerConnect switch configurations over the years, and even though their configuration console is quite IOS like, it doesn't manage configuration statements the same ...
-5
votes
2answers
889 views

half-duplex and full-duplex Ethernet vs Switches and Hubs [closed]

From a youtube video I came to know of the following things All machines connected to a HUB are a part of a single collision domain. All machines connected to a SWITCH are a part of a single ...
10
votes
5answers
3k views

If you turn on spanning tree, how do you know there is an issue with your network?

I have been learning about spanning tree protocol (STP/RSTP/MSTP) and was wondering, once I turn it on and it's protecting against for example network loops, how do I know there is a network loop? I ...
0
votes
1answer
2k views

OS X Server with Open Directory and Network Configuration

I am trying to use a Mac Mini as an Open Directory domain, however it fails on the Open Directory Setup. The exact error from the log is a below: Server[308]: An error occurred while configuring ...
0
votes
2answers
822 views

Mismatch between IP address and MAC Address

Suppose you have two interfaces in the host belonging to the same subnet connected to a normal L2/L3 switch port which has a single vlan with interface IP 10.0.0.1. nxge0 (10.0.0.201) ...
1
vote
1answer
401 views

Cisco SLM248G Switch Hardware Reset

We have two Cisco SLM248G switches within our environment. After some research, it seems that one is causing a few problems because during heavy loads, it is sending transmissions to our firewall ...
5
votes
1answer
337 views

ProCurve network expansion

I've hit a bit of a wall with our network scale-out. As it stands right now: We have five ProCurve 2910al switches connected as above, but with 10GbE connections (two CX4, two fiber). This fully ...
4
votes
4answers
1k views

How to wire 20 computers and 20 phones and 1 server into LAN?

I have currently 3 switches Two Netgear JFS524 with 24 slots, One Belkin with 16 slots. Server DSL Internet Router. Main question is how to connect switches together, two Netgear's are next to each ...
1
vote
2answers
4k views

Difference between ethernet switch and ethernet pass-through

Most blade server systems can have an ethernet switch module or an ethernet pass-through module. What is the difference between both? Is the pass-though module simply "dumb" as a hub? Why would you ...
0
votes
1answer
3k views

Configuring VLAN on Juniper EX2200 switches

I have a Juniper EX2200-24T switch.It is configured as an L2 switch (i.e the interfaces are configured in such way that they do not have an IP address.).I have manually connected the port ge-0/0/0 of ...
9
votes
2answers
510 views

Why WakeOnLAN frames are sent to broadcast

I'm trying to figure out why wake on lan frames, in the simplest form, are designeted to the ethernet broadcast address (FF:FF:FF:FF:FF:FF) and not to the address of the machine to be powered on. ...
2
votes
1answer
466 views

LACP Total Speed

If we were to connect two switches together using LACP (with 2 X 1Gbe ports on each side), does this mean that the max speed that a single MAC address will ever reach is 1Gb? So for example, if a ...
4
votes
3answers
1k views

Phantom NIC issue causing eth0/1 to drop out

We are experiencing a very strange and frustrating problem. Our company has servers here in Massachusetts, as well as in California. The issues we are seeing are only on the CA hardware. Out in CA, we ...
1
vote
3answers
1k views

Cascading gigabit switch (10/100/1000) with fast ethernet switch (10/100)

I'm a newbie in networking. I have this question in mind lately. I bought a gigabit switch and tried to cascade it with my existing fast ethernet router and switch. I have 1 server which is connected ...
2
votes
1answer
14k views

How do I factory reset a 3com 5500G-EI?

I have inherited a 3com 5500G-EI without any configuration docs, and I need to reset it to factory defaults. What is the best procedure to do this?
0
votes
1answer
1k views

Broadcast storm [duplicate]

Possible Duplicate: How managed switches handle Broadcast Multicast and Unicast? An application published broadcast message to a network, and caused network switch to drop packet. I have ...
2
votes
2answers
162 views

Are Multiple NIC Ports Needed for a Cross Connect at a Colocation?

If one is going to run a cross-connect in a data center colocation does that mean that it requires another physical network port in the machine being connected? For example if a machine in a data ...
2
votes
2answers
2k views

Will 100 Mbps client slow down 1000 Mbps network?

Newbie question: We are planning to setup a LAN in our lab, and are looking at gigabit ethernet switches. A couple of our older computers have 100 Mbps ethernet, will they slow down the whole network ...
0
votes
2answers
541 views

Netgear (gsm7224v1) 24-port gigabit switch exhaust fans

I own a Netgear GSM7224v1 (link) 24-port gigabit switch at home. The switch is about 2 years old and works just fine. The two exhaust fans however, are making quite a bit of noise even after I've ...
3
votes
5answers
8k views

How to capture Wireshark packets when using a switched network in Windows

I’ve been asked by our SIP trunk provider to run a Wireshark trace on the network when we receive calls. The issue I’m having is that if I run Wireshark from a laptop plugged into the main switch I ...
0
votes
1answer
1k views

Which switches can I use for Ethernet bonding?

I'm just about to configure a DELL PowerEdge T410 server with 2 network cards. I'm trying to decide for a network switch and I'll need to configure the server for link aggregation later. I read the ...
0
votes
3answers
596 views

What is the difference between a hub and a switch?

I'm sneeking around online store for used stock of hubs, routers and switches for a project I have to build a network infrastructure. So far, I have bought: 1x Cisco 2514 Router; 5x Cisco Serial ...
3
votes
1answer
256 views

Failsafe Ethernet Switches on UAV

As a side project we are working on a new internal network for a small UAV and will base it on 100mbit Ethernet instead of serial coms that's usually used for these types of aircraft. We have gone ...
0
votes
3answers
778 views

What could be the maximum number of hosts on a 100BaseTX ethernet network?

I'm having two ip networks (192.168.1.x and 192.168.2.x) bridged on a server, but all hosts (fixed IPs) are on the same physical 100BaseTX ethernet (with a daisy chain of 48ports switchs). Often, I ...
2
votes
2answers
329 views

H/w suggestions for 24 port PoE switch [closed]

I am looking for a 24 port PoE(IEEE 802.3af) switch to power some Snom phones that I have. Please suggest some appliances. I just need basic L2 functions and wouldn't want to go for a expensive Cisco ...
0
votes
1answer
3k views

Cascading switches: uplink to uplink?

I'm a bit confused as to why I haven't seen any references online to using Switch A's uplink port (1Gbps, 24-port 10/100) to connect to Switch B's uplink port: everything I've seen -- including ...
9
votes
4answers
3k views

How long do managed gigabit ethernet switches take to boot up?

One critical drawback that I have found in researching managed-switches, and one that I have some past experience with is that anything with "lots" of firmware is going to have lots of issues ...
2
votes
1answer
5k views

How does Brocade (Foundry) FastIron CX compare to Cisco 3750 stackable switches?

We're considering Brocade's CX series vs. Cisco's 3750 at both core and distribution layers for a new site with gig to desktop, without POE. If you have any hands-on experience with FastIron CX ...
0
votes
3answers
874 views

layer 2 failover within the rack

what do you do to avoid downtime caused by top-of-the-rack switch hang / malfunction? some possible solutions are can be found in this presentation. i'm interested in hearing how do you approach the ...