We have implemented a new network consisting ofHP big central switch and 18 HP managed edge switches. We also have hp procurve manager.
If there is a loop anywhere in the network it affects the whole network therefore, I wanted to ask how I can prevent collisions to spread to the whole network? Does something needs configuring to do this??
Thanks.
This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.
Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.
If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.
Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.
Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.
Access the answers to your technology questions today.
30-day free trial. Register in 60 seconds.
Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.
Try it out and discover for yourself.
30-day free trial. Register in 60 seconds.
Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.
I don't think what you're looking for is to prevent collisions, but to prevent broadcast storms, which occour when a broadcast gets cought in a switching loop. What you need to look at is either Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP). These protocols prevent switching loops.
Sometimes naughty kids in our school create a loop by plugging in the same cable in two network sockets creating large build up of traffic hence resulting in collision grinding the whole network to halt.
How can I prevent this from happening?? There must be some sort of configuration within the switches that need doing..
Making the links connecting to the switch full duplex links will prevent collisions. By default, the ports are in auto duplex mode so if the connected device is capable they will be in full duplex mode.
Spanning Tree Protocol is enabled by default which will prevent loops.
So basically, you don't have to do anything to prevent collisions or loops.
STP or RSTP does cause a delay when activated, it will turn off all the ports on the network for about 30 seconds to a minute. during this process it's listening for traffic, then learning traffic patterns, then it starts turning ports on. Newly activated ports will go through this process when a comptuer is plugged in. this means that it takes a little longer for clients to recieve IP address and such, so just be aware of that when you're adding new computers, or switching ports, etc. But yes, turning that on will resolve the issue you're expirencing.
Im not sure if the HP switches have the same option that cisco does but.. If I were you the easiest way would be to turn on Spanning Tree, Hardcode all your switch ports to access ports so that they can't form trunk links and for good measure enable BPDU guard to prevent outside managed switches from become the root bridge. If you have 18 switches hooked up back to back loops will form
Procurve have no spanning tree as default and also Auto-MDIX as default.
Auto-MDIX: automatically adjusts for straight-through or crossover cables.
Asume you have a star topologi, no loops in YOUR setup, only want to prevent naughty kids from linking one port in an edge switch to an other port in same, then you could also
on all edge switches configure:
No Auto-MDIX
Then it would take a crossover patch to make a loop.
(If you configure the central switch also with No Auto-MDIX however, you need a crossover cable in your wiring closets to link the central-sw and every edge-switch)
If you have loops in the network of you own, on purpose or unplanned to come ;-) then spanning tree planning could come into the picture.
As metioned by frution3000 it is important to plan and implement root and backup-root switch.
Please provide topologi if your layout is not star-like / you want the experts to help configure STP.
Business Accounts
Answer for Membership
by: rochey2009Posted on 2009-10-29 at 14:49:24ID: 25698614
Hi,
If your using switches there shouldn't be any collisions. Collisions only happen on Ethernet hubs.