09-20-2011 01:44 PM - edited 03-07-2019 02:20 AM
We are having an issue on a 2960 switch when we add a new device to the switch (in this case a printer), the rest of the devices drop.
They only come back if we reboot the switch.
Any ideas?
09-20-2011 01:59 PM
Hi,
what do you mean by all other drop?
Regards.
Alain.
09-20-2011 02:44 PM
the other devices - pc's - lose connectivity
09-20-2011 02:53 PM
Are you sure the printer is not connected to a different switch and connected to the 2960? Sounds like you have a broadcast storm happening.
09-20-2011 03:12 PM
we are directly connecting it to the 2960 which in turn is connected to a 3560 which is our root switch
any way to turn off broadcasting?
09-20-2011 03:24 PM
Try this command in the interface where this printer is connected "spanning-tree bpduguard enable". This command will shut down (err-disable) the port if the switch can "hear" BPDU coming into the said port. You can re-enable the port by issuing the commands "shutdown" followed by a "no shutdown".
Does your 2960 have a Gig port to do some trivial testing? If it does, connect the printer to the Gig port and issue the following commands:
1. interface Gig0/1;
2. media rj
3. end (this command will take you out of configuration mode)
4. test cable tdr int Gig0/1
5. Wait for about 5 to 7 seconds
6. sh cable tdr int Gig0/1
7. conf t
8. int Gig0/1
9. media auto
10. end
Post the output for the "sh cable tdr int Gig0/1" command.
09-21-2011 05:33 AM
Hello Regis,
Can you tell us if we see the mac addresses of the desktops in the CAM after you add this device?
What VLAN does the printer to belong to? What VLAN are the desktops in?
Also, can you share the output of the following when the issue occurs:
- sh spann de ac | i exe|Number of top|from
- Config of port where the printer is connected
Cheers!
Kapil
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