Swapping a switch to a connected PCs.

Swapping a switch to a connected PCs.

For instance, After Business hours when noone is connected to the network, a Network administrator can replace the  Distribution switch ( to which Access Switches are connected to)
I would like to know in The next day when end users login to their PCs , whether there will be any delay ?

Thank you
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nociSoftware EngineerCommented:
Eh no....
You can swap live connections if done in less then about 30 seconds...
servers can be setup to act on interface changes to failover to other systems, in that case you cannot do this in any time without anybody noticing...
JohnBusiness Consultant (Owner)Commented:
We do that and there is no issue. If a switch fails (rare) we get people to log off, change the switch and all is well in seconds.

For instance, After Business hours when no one is connected to the network,  <-- People should log off their workstations at the end of each day,, NOT stay logged in.
jskfanAuthor Commented:
Most of the users   lock their computers before they leave work, they do not log off,
If I understand since it is Distribution Switch that will be changed, then the only new MAC addresses registration will be from the Access Switches that were initially connected to the old Distribution Switch.

If it was the access switch that will be changed then probably it will take some time to the PCs to register their MAC addresses on the Access Switch. I could be wrong.
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JohnBusiness Consultant (Owner)Commented:
If they do not log off and their connection is changed, they will lose their work and there may be a short delay for the reconnection.

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jskfanAuthor Commented:
Their PCs will stay plugged to the same Accesses Switches. it is just the Distribution Switch that will be swapped.  Though the Access Switches will be connected to the new distribution switch that might give a hick up
JohnBusiness Consultant (Owner)Commented:
If they are logged in, yes.
nociSoftware EngineerCommented:

If it was the access switch that will be changed then probably it will take some time to the PCs to register their MAC addresses on the Access Switch. I could be wrong.

You are wrong here, registring the mac address happens on ALL packets sent from a system through a switch  (source mac and port where it was seen are registrered, so it takes one packet.  If a mac address  is unknown then the packet will be broadcast to ALL interfaces.
The MAC addresses of switches are only relevant IF you logon to the switch itself.

You will loose work if session get a chance to timeout. That wil happen on most systems within 2 minutes. first retransmissions occur in 30 seconds.  So pulling a cable and replacing it in a working switch within 30 seconds, is doable.  
So the "new" switch needs to be accesible to the network before cutover is done.
jskfanAuthor Commented:

the new Distrbution switch will be replaced after Business hours while users have already locked their PCs and gone home.
I am trying to find out what will happen the next day, when users come back to work , they unlock their PCs and login to the domain. is it going to be any issue ?
JohnBusiness Consultant (Owner)Commented:
If  they have closed their files, then everything should be fine when they return. If they leave an application running, they risk losing data. They should be encouraged to log off.
nociSoftware EngineerCommented:
I agree with John Husrt, encourage to shutdown PC's.
then again build the new distribution swith into the rack/ put it under /on top of the current one.
Add cabling to add this switch to the core... (then you can also test the configuration (VLAN's, uplink etc. etc.)  equivalent to the current switch.
Later when you start migrating you can safely move all cables where the link lights are indicating down.  (do those last)
The others (blinking, active) you can pull and insert into the new switch within a few seconds,  
Do guarantees for "no side-effects"  but there should be a lot of those for regular connections.
jskfanAuthor Commented:
Thank you Guys!
JohnBusiness Consultant (Owner)Commented:
You are very welcome and I was pleased to assist you.
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