All Questions
155
questions
0
votes
1
answer
112
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 ...
user52167
1
vote
0
answers
387
views
How Cisco Line Protocol works
How do Cisco Line Protocol works ?
I could read this: https://www.cisco.com/c/en/us/support/docs/content-networking/keepalives/118390-technote-keepalive-00.html, about Ethernet Interfaces keepalive ...
- 1,085
0
votes
1
answer
645
views
If physical switches are necessary in a SDN
Exploring how to implement a Software Defined Network and here it explains that an SDN switch is only dealing with the data layer. But then:
Do We Need Special SDN Switches for SDN Networking?
...
- 107
0
votes
1
answer
159
views
Why doesn't Ethernet protocol support switch fabric topology?
While learning about Fibre Channel and SAN, I found the following information on IBM Knowledge Center:
A switched fabric is a fibre channel topology in which individual node
ports are ...
- 103
6
votes
2
answers
495
views
How to connect a special device in a network
I have a question which is puzzling me.
I have a couple of custom electronic devices (are identical, one is a master and the other is a slave) which implement only up to level 2 of the ISO/OSI layer, ...
- 61
1
vote
1
answer
55
views
Half duplex setting switch forwarding frame collides with host forwarding frame
So my question is regarding half duplex switches connected to hosts. Consider a case where a switch is connected to a host by a single link. In an event where a switch decides to forward a frame to ...
- 113
7
votes
3
answers
10k
views
Posible to connect VLAN switch through dumb switch?
Is it possible to connect a VLAN switch into a dumb switch ?
The router will know how to reach network connected by a VLAN through the dumb switch please ?
No edge effect ?
By example, a schema of ...
- 71
1
vote
1
answer
466
views
How to avoid microbursts causing drops?
I have a network issue that has to do with microbursts. I will first tell a bit about the network:
There are 4 Aruba/HP ProCurve switches. 1 Core switch and 3 downstream switches. All connections in ...
- 11
5
votes
3
answers
6k
views
How to debug L1 Auto negotiation issues?
One of our Linux hosts has started switching its gears recently. While checking the interface speed, I could see that the interface has switched down to 10Mbps. The NIC and Switch are capable of 1G ...
- 1,412
0
votes
1
answer
124
views
Unconnected cable in a switch
A cable plugged into a switch but unconnected on the other end, might lead to any problem in a "noisy" environment (industrial)?
It's short, 50 cm, but there are motors, inverters, power supplies ...
- 103
2
votes
1
answer
15k
views
Packet vs Circuit switching
I have a 1Mb/s link each user uses 100Kb/s when active.
With 10 user active 10% of the time, I can have 10 users in a circuit switched environment. Packet switching with 35 users, probability > 10 ...
- 499
6
votes
2
answers
31k
views
End-to-End delay
I’m working through questions from computer networking top down approach and was hoping to get some clarity on the end-to-end delay calculation. At this stage we are not considering processing, ...
- 499
6
votes
5
answers
2k
views
Does a Layer 3 switch become a Layer 4 device when telnetting?
In order to Telnet to a switch (Layer 2) we create an SVI, thus a layer 3 point of contact is made. The switch inspects each packet sent from the remote client and responds to it so that it gets ...
- 61
1
vote
1
answer
58
views
IP/Device Question
I am very new to this field and I want to ask a quick question about IP/Device HTTPS.
When we type in the IP address of the device (cisco switch, router, firewall, etc), we can access to the web ...
- 13
5
votes
2
answers
687
views
What is the springing mechanism for on the top of this transceiver module?
Some Ethernet SFP modules have them, some do not. What is the yellow springing mechanism and the attached metal wire meant for?
- 153