Latest threads in Ethernet LANshow only best voted threads

Subject Author Posted Replies
 
Broadband or not
There is discussion in some newsgroups (and other places) about what is and isn't broadband. It seems to me that the meaning, in EE terms, relates to the bandwidth relative to the carrier frequency,...
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switch ports as distinct OS interfaces
We're designing a network device based around SoC, which contains MIPS core and 5-ports switch core, connected to the CPU via internal MII port. Device driver provided by a chip vendor represents...
 
Ethernet over Ethernet
Bonjour, I don't know the reason why it is not possible to have an Ethernet frame (ETH) directly encapsulated in an Ethernet frame (ETH). Take care, I'm not talking about 802.1ah-2008 MAC-in-MAC, or...
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question on MDIO bus
[ I beleive this is proper groups to ask such question. ] I'm implementing MDIO/MDC interface with GPIO pins on a microcontroller (i.e. one pin for MDIO line, and the other is for clock). I have read...
 
Network latency questions
Hi all, Sorry for abusing my membership to this forum for this question. We are busy with building an embedded application that must retrieve data very fast. The choice is to either have the data...
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Multi-WAN switch
Is there any switch that allows two different WAN and multiple LANs running out of a single wire? Let me clarify my question with a picture: the top, the current configuration. The distance between...
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LACP mac addrss ?
The link aggregation combine a couple of physical links to a logic link. but which mac address is used for the LACP group? TIA, st LACP is a link-constrained protocol, i.e., LACP frames never leave...
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switch-to-CPU interface
Reading Rich Seifert's "The switch book", I got confused. At one moment Mr. Seifert writes that normally there are two interfaces CPU-to-switch: one is simply control interface to read/write the...
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Reset the password on my HomePortal 1000SW?
Have a modem and wireless router. HomePortal 1000SW, 3.5.5 Trying to get past the lost password. FWIW. I take lots of notes, but none of the recorded passwords work. Apparently, a more recent version...
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MII Management Interface, turnaround bits
Hi I'm implementing software GPIO based SMI protocol for a small embedded microcontroller, and got stuck with turnaround bits. As I understand it, after reading 802.3 spec, it consists of two bits,...
 
switch auto polling
Hello, everybody reading through specs of switch ASICs I often find the term "auto polling". What exactly does it mean? As I understand it is hardware assisted feature of the switch, constantly...
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why does cisco support 16 instance for mstp?
Hi, why does almost network company support only 16 instance for mstp? TIA, st or 64 instances? reason? e: It's a power of 2? Honestly I do not know. What does the standard say? Ed ote: I don't find...
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Ethernet Padding
Hi All, This post is related to Ethernet padding. When the payload is small, Ethernet adds padding to make the frame size to 64 bytes. (Ethernet's minimum frame size is 64 bytes). This padding, will...
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tolerating loops in a network but not using STP
I'm designing a low latency ethernet network for ~300 servers (a compute cluster). End-to-end latencies are pretty low so that switching latency becomes critical. Each additional switch hop adds, say,...
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Anyone have - Top Ten Stupid Networking Ideas
Top Ten Stupid Networking Ideas Anyone know where I can get Mr Seifert's said list? I found a conference paper via google but it's not worth $19 to me:) I am pretty certain it was on this group but it...
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