?
Solved

Cisco switch config with a dumb switch

Posted on 2013-06-17
7
Medium Priority
?
583 Views
Last Modified: 2013-06-18
Hi Experts,
I am have a vlan 25 assigned to a port and I need to extend that drop to more than one host, and need to connect a dumb switch to that port. All devices on that port will extend vlan 25 and no other vlans will be present on that dumb switch.

I know I need on that interface:
switchport mode access
switchport access vlan 25

Do I need to completely disable spanning-tree on that port?

Please advise.

Thanks,
Marek
0
Comment
Question by:maredzki
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
7 Comments
 
LVL 50

Expert Comment

by:Don Johnston
ID: 39254669
Do I need to completely disable spanning-tree on that port?
Nope
0
 
LVL 17

Expert Comment

by:Kvistofta
ID: 39254912
IF you disable spanning-tree on that port AND you connect 2 ports of the dumb switch to create a loop, your Cisco-switch would not prevent that from happen.

So I would say that you SHOULD keep spanning-tree running on that port to avoid that from happening.

Regards
Jimmy
0
 
LVL 50

Expert Comment

by:Don Johnston
ID: 39254918
If two ports on the dumb switch are connected, spanning tree won't help.
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 17

Expert Comment

by:Kvistofta
ID: 39254940
Yeah, because the Cisco-switch will see his own BPDU:s coming back.
0
 
LVL 2

Author Comment

by:maredzki
ID: 39256187
So what do you guys suggest, keep spanning-tree there with portfast or other setting? The reason I ask is that the cisco switch warns when you set spanning-tree portfast on a port that if you have the port connected to a hub, switch, bridge etc it will cause issues.

Marek
0
 
LVL 50

Accepted Solution

by:
Don Johnston earned 1000 total points
ID: 39256225
I'd keep STP on. Because there's nothing to gain by turning it off.

Portfast on offers no benefit so that won't matter.
0
 
LVL 2

Author Comment

by:maredzki
ID: 39256313
Ok, I will keep the seettings I have and use them for the port connecting to the dumb switch:

spanning-tree portfast
switchport mode access
switchport access vlan 25
0

Featured Post

Bringing Advanced Authentication to the SMB Market

WatchGuard announces the acquisition of advanced authentication provider, Datablink, with one mission – to bring secure authentication to SMB, mid-market, and distributed enterprises with a cloud-based solution, ideal for resale via their established channel & MSSP community.

Question has a verified solution.

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

There are times where you would like to have access to information that is only available from a different network. This network could be down the hall, or across country. If each of the network sites have access to the internet, you can create a ne…
WARNING:   If you follow the instructions here, you will wipe out your VTP and VLAN configurations.  Make sure you have backed up your switch!!! I recently had some issues with a few low-end Cisco routers (RV325) and I opened a case with Cisco TA…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…
Suggested Courses

766 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