11
votes
Accepted
Why can't we create a hierarchy of hubs?
To add to Ron's point - a hub (...or a number of hubs) basically models the behavior of the original Ethernet, which is to say basically a big piece of coaxial cable. If one station transmits, all ...
- 6,144
9
votes
Why can't we create a hierarchy of hubs?
Are uplink ports simplex ?
Hub interfaces are simply hub interfaces, there really are no uplink interfaces.
Why is it not possible for the hubs to read from the uplink port and
broadcast the frame ...
- 100k
8
votes
Accepted
How does link aggregation work in reality?
What really happens is that any one flow only uses one of the links. Different flows are assigned to different links based on a hashing algorithm, so, in aggregate, you get the full bandwidth of the ...
- 100k
8
votes
Accepted
Must 40/100G uplink ports on a 10G switch be connected to another switch?
That switch uses (Q)SFP+ ports which are essentially PHYless. You need to either use matching PHY type transceivers on both the switch and the host ports (e.g. 10GBASE-SR or 40GBASE-SR4) or direct-...
- 86.4k
6
votes
Why can't we create a hierarchy of hubs?
It's not that you cannot physically create a hierarchy of hubs. You can. And it will work to some extent (limited by timeouts once your network is too big). The thing to know is that such a ...
- 161
5
votes
How does link aggregation work in reality?
Adding to Ron's excellent answer, with the vast majority of switches there are three different hashing algorithms: MAC address (L2), IP address (L3) and IP address plus port numbers (L4).
The ...
- 86.4k
4
votes
Why can't we create a hierarchy of hubs?
An Ethernet network (without fancy extensions) MUST be a tree. You can put a sticker on one of those hubs saying "main hub" and call it the top of your hierachy if you want the protcol doesn'...
- 13.6k
3
votes
Accepted
Can I aggregate multiple uplink ports between Ethernet switches?
Goal: To the greatest extent possible, I would like to provide 10-GbE line-rate performance between any pair of hosts in both rooms.
In order to truly guarantee 10G, you'll need 10G dedicated ...
- 86.4k
2
votes
How do you calculate required uplink on a Switch?
It all depends on your workloads.
If you've got eight "light" users that work with some office documents, surf the 'net, send and receive a few emails, oversubscription is a non-issue. It might not ...
- 86.4k
2
votes
one uplink, two routers for redundancy
You can do this with 10base2, but I'm sure you're talking about equipment which is using twisted pair.
The main problem is how to detect that Router A has failed. Many failure modes -- eg CPU ...
- 16.3k
2
votes
Why can't we create a hierarchy of hubs?
I think your terminology of "uplink port" might be a source of confusion.
Connecting a pair of hubs together by a patch cable will fail, unless one or both of the hubs does auto MDI ...
- 737
2
votes
Why can't we create a hierarchy of hubs?
I came to know that we cannot create a hierarchy of hubs. My question is why so?
That depends on the book's definition of "hierarchy". In CSMA/CD, no repeater has more "weight" ...
- 86.4k
2
votes
Network Design: Daisy Chaining vs One Centralized Switch
Network Design 101. There are 3 general concepts, but no "standard". They all have their own set of pluses and minuses. There are too many questions left unanswered (I suspect, unasked) to ...
- 32.4k
2
votes
Deprecation of 10Mbit links and workarounds
Is it true that (some) newer switches dropped support for 10 Mbit links?
While the Ethernet standards theoretically permit any combination of speeds, there are de-facto standard combinations of ...
- 13.6k
2
votes
Accepted
Deprecation of 10Mbit links and workarounds
10 Mbit/s isn't deprecated officially at all (by IEEE). 10BASE-T even got a lower-power variant 10BASE-Te in 2010 and new single-pair variants in 2019.
10BASE-T is still in common use for Wake-on-LAN ...
- 86.4k
1
vote
Deprecation of 10Mbit links and workarounds
Basically, it is high-end distribution/core switches that do not support 10 Mbps. Most access switches (where you connect end-devices) still support 10 Mbps.
Normally, you will use an access switch to ...
- 100k
1
vote
Accepted
Configuring shared uplink on l3 dell s4128f-on
The router to which your layer-3 switch (which is also a router) is connected needs to be told how to reach the networks on the layer-3 switch.
Routers learn routes in three ways:
Directly connected ...
- 100k
1
vote
Accepted
Uplink port: standard LOCATION at beginning or end port?
There is no industry standard. Common practice is to use either the first ports, or last ports. But it's a personal preference (or maybe company policy), one can use any port(s).
(If the switch has ...
- 32.4k
1
vote
Multiple uplinks in multiple locations
First, you can't do link aggregation unless the carrier is also doing it on their end. But you can load balance between all three 100 m connections. It's best if you can run a routing protocol with ...
- 67.9k
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