A tag 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.
6
votes
4answers
154 views
Redundancy between router and servers
In the past, I was using a NetGear GS724T between my router and my servers. Unfortunatly the switch suddenly died.
Now I've changed it for a GS748T and also bought one more and I am wondering how I ...
2
votes
3answers
129 views
Is a router always necessary to link two subnets?
I am thinking especially of VLANs, which represent separate subnets that may need only one switch.
0
votes
1answer
89 views
Practical uses for a new switch [closed]
Ok, I'm kind of a network newbie, at least from an enterprise perspective. Lots of theory and course work, little hands on. I've got a small two enclave network, and someone handed me an excess ...
6
votes
3answers
78 views
Setting up DHCP server on the router or on the switch?
We're using the Cisco 1921/K9 with a SG300 L3 switch. Does one set up DHCP server on the router or on the SG300? If both is capable, what is the reason to choose one over the other?
Note: I have 4 ...
6
votes
9answers
258 views
Locate a host on Network
What is the best method of locating a particular workstation on a VLAN ?
I sometimes need to do this, if a workstation IP address, shows up on an ACL Deny
torrent use
High bandwidth usage (Top ...
7
votes
1answer
95 views
Cisco IOS built-in SSH client default version
You issue the command ssh 192.168.97.97 from a IOS device and the destination IOS router/switch SSH server is accepting both SSH versions. Being that you did not specify a version to use on the SSH ...
12
votes
3answers
392 views
What happens when 2 computers transmits at the same time to a 3rd one in a full duplex switch?
Consider the following scenario:
I have 2 PC's (PC1 and PC2) that wants to transmit at the same time to PC3 in a full duplex ethernet switch. Let's consider that all ports are in the same VLAN, so ...
10
votes
3answers
149 views
Why we get high fluctuation on bandwidth measurement Cacti graph?
We were on redundancy test of Etherchannel and Routing on our network. During this intervention we made some measurement. Our monitoring tool is Cacti for graph.
The equipment monitored is a 4500-X ...
10
votes
4answers
139 views
Do faster segments of a network mean faster flow rate or lower latency?
This is another one of those hypothetical questions. I've been trying to figure out whether or not having a faster 'segment' of a network in between host A and host B will translate into a faster flow ...
7
votes
2answers
55 views
CDP not available to be enabled on ME3400 port
We have a ME3400 that we want to enable CDP on but there is no cdp option. Why is it not available?
switch(config)#int gi0/1
switch(config-if)#cdp ?
% Unrecognized command
CDP is enabled globally.
...
2
votes
4answers
93 views
Can a VLAN bridge be used to replace a bypass switch with an IPS device?
I am wondering if it's possible to set up a way to remove the need for a bypass switch when using an IPS device. To summarize, I would have an IPS device acting as a virtual wire on a connection I'm ...
1
vote
2answers
63 views
Regarding Home Network and Structured Network Panel [closed]
I have a question that maybe pretty simple for those who are little more adept at this. Recently, I've been wanting to get the Ethernet ports around my house (which was built last year) live. I have a ...
13
votes
5answers
286 views
Building new network and need 200+ wireless devices
I'm planning the network for my company's new office space. I'm not an expert so I'd like to present my plan and ask y'all nice folk to tell me if and where I'm making mistakes.
Assumptions:
...
1
vote
5answers
115 views
Is it common for rackmountable servers to have fibroptic input and output? or is it cat 5 and you have to convert after?
If the switching hub is in the floor above the server, I've heard its best to use fibre-optic cabling to avoid interference from unrelated electrical cabling in the ceiling for lights etc...
Is it ...
3
votes
3answers
66 views
Is it necessary to use layer 2 switches with microwave point-to-point links?
For a university project we are designing a network across 3 buildings for a small business. I've decided to implement a microwave point-to-point to connect each building.
A lot of microwave ...
2
votes
2answers
33 views
Brocade switches per vlan STP support
Do Brocade switches(FastIron, NetIron, ICX, etc) support using a per vlan spanning tree or do they only support a single spanning tree instance for all VLANs?
If they support per vlan:
Is it ...
6
votes
3answers
165 views
How to test layer 2 connectivity on Cisco Switch?
I'm testing a new FTTH CPE in our lab. A Cisco ME3400 switch. So far I'm having issues in provisioning them. I have activated DHCP debugging to see the DHCP packets.
I wonder how can I test to know ...
-4
votes
1answer
76 views
switch locks up under bittorent protocol [closed]
Switch locks up on bittorrent traffic.
i have a trendnet 24port smart switch that can handle any traffic except bittorrent, whenever a system is running the torrent protocol the port that it is on ...
5
votes
2answers
118 views
3750G Switch Buffer Monitoring
We have put some 3750Gs in a stack for our DC access switches. We are concerned that these won't be able to handler higher data loads as traffic increases due to their limited buffers. What ...
5
votes
4answers
76 views
Cisco SFP module: Determing Priority?
I have two 3750 Cisco switches that have two fiber cables/sfp modules hooked up on each. The second fiber is just for redundancy.
I have installed two new 3750X switches on the rack for the upgrade, ...
11
votes
3answers
352 views
How do you know if a Cisco switch is handling traffic well?
I have just read Jeremy's question about 2960-S and iSCSI traffic handling, which drove me to ask this question: We all have lots of switches deployed in distinct infrastructures, how can you know ...
9
votes
2answers
123 views
Why does “show interface” show “Last input never” when packets input is incrementing?
Why is it that when I perform a show interface command I see that Last input always shows never?
FastEthernet1/31 is up, line protocol is up (connected)
Hardware is C6k 100Mb 802.3, address is ...
10
votes
7answers
539 views
How to connect 5 different networks together?
I have a network consisting of three servers in a data center, all of which are connected to each other via a switch.
In addition to this I need this network to access 4 additional networks, most of ...
4
votes
4answers
149 views
Are multiple links with different VLANs between two switches possible?
I'm not considering Etherchannel or LACP.
Given 2 Ethernet switches A and B, where both switches have port 0 configured as a tagged trunk for VLAN 100 and 101 and port 1 configured as a tagged trunk ...
8
votes
3answers
964 views
Is there such thing as a network bridge?
Is there such a thing as a network bridge or is it always meant as a switch implementing a bridging function?
Whilst bridges are described as devices that create separate collision domains in network ...
21
votes
14answers
3k views
How to diagnose a bridging(ethernet) loop?
Given that spanning tree has failed, or you don't have any spanning tree - and get an ethernet loop, what's the best way to diagnose where the problem is ?
Which switch, which cable and so on.
9
votes
2answers
94 views
Is Nexus 7000 series line card “OIR” impact-free?
I have read many data sheets on the Nexus 7000 series and it's cards purporting to be capable of OIR (Online Insertion and Removal).
However I have never needed to replace/reseat/add any Nexus line ...
7
votes
1answer
90 views
Migrating from STP short mode to long mode?
It was decided recently to migrate a large campus network from the short mode STP costs (16-bit) to the long mode STP costs (32-bit).
I have clearly found it documented that this needs to be a ...
9
votes
5answers
308 views
What causes total output drops on a cisco switch interface?
I have an HP c7000 blade chassis which contains Cisco 3120X and Cisco 3120G switches running ios 12.2(58)SE1. The blades themselves are very lightly loaded yet many interfaces on different blade ...
12
votes
5answers
417 views
In a multi-tenant environment what should be done to make your switchports silent on Cisco and Juniper switches?
For example preventing it from sending arp, stp, etc and to reveal as little as possible about the rest of the network.
Example use case would be connecting to a peering exchange.
