Solved

Switch / hub question

Posted on 2000-05-06
4
245 Views
Last Modified: 2010-04-17
Here's an easy one: do I always use a crossover cable to link together two switches or hubs?  Are there instances when I can use a cut-through?
0
Comment
Question by:Silas
4 Comments
 
LVL 2

Expert Comment

by:jgarr
ID: 2784933
Maybe. Normally you would use a crossover cable, but if you connect to the hub or switches MDI/MDI-X port you can select to cross the port by pressing the switch in . This allows a straight through cable to behave like a crossover.
I believe that when you connect a switch to a hub, you would use a straight through cable.

Hope this helps.
0
 
LVL 3

Expert Comment

by:apadua
ID: 2785815
Every port needs to be inverted, so that the TX pair on one NIC gets to the RX pair on another. That's why the numbering on ports of some brands of hubs are 1x, 2x, 3x, etc...

So if you connect a hub to another hub, you have your pairs inverted twice, which get's you back to where you started. However, if you use a cross-over cable, you invert it a third time, which gets you back to inverted.

If your hub has an MDI/MDI-X selector on one port (as jgarr mentioned), the second selection (MDI-X) would make your port behave normally, as if it were a regular X port. IF you select MDI, you get a port that is not inverted. That way, you can connect an MDI port to a regular port of another hub with a straight cable and you have 1 inversion only, so your pairs are inverted as you wanted.

Got it? (Or lost it? :-)


A.
0
 
LVL 3

Expert Comment

by:bartt
ID: 2795606
apadua is right and I think that he should earn the points, but from what I know is that it depends on the manufacturer of your device. I know that with Cisco switches you can use special cableling for such a connection

Bartt
0
 
LVL 1

Accepted Solution

by:
elvey earned 10 total points
ID: 2815706

Most switches and hubs have a switch for which you can use a cut-through, though they have different labels on different equipment - MDI/MDI-X, Uplink, hub, etc.  Some have no switch, but one port has the crossover 'built in', so you use a straight thru cable.

And for very inexpensive cables, try cableclub.com; I've ordered from 'em 2x, no problems.  
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Cisco Switch Password ---Urgent 3 49
Error on login Cisco RV016 1 32
Cisco Sup720 Migrate to Sup2T 5 55
eBGP policy and ACL in interface 7 45
In a WLAN, anything you broadcast over the air can be intercepted.  By default a wireless network is wide open to all until security is configured. Even when security is configured information can still be intercepted! It is very important that you …
While it is possible to put two routes in place with the secondary having a higher metric, this may not always work. In the event of a failure that does not bring down the physical interface on the router the primary route is not removed. There is a…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

943 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now