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Beginner

Double Up-Link configration

Dear All, 

Hope you have good day, I'm facing some network related issue in my workplace, i hope you have time to readout to understand my network structure and the issue.  

 

I'm connected my different location through Fiber Optic Media Converter, for emergency and backup purpose i'm using 2 MC (up-link) on each location, in my IT room both the MC connected with Cisco Catalyst 2960 switch, now i want to connect both the up-link to my Cisco SG300-28PP Manged switch. when its connected with 1 up-link to my branch location the network working properly and the user are able to access my network, but when I'm connected both link to my Branch location's user are didn't able to connect the network. 

 

I hope i'm able to explain the issue, required your help to solve the issue. thanks in advance for your time.

           

7 REPLIES 7
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Hall of Fame Community Legend

Re: Double Up-Link configration


@hasim wrote:

but when I'm connected both link to my Branch location's user are didn't able to connect the network.            


Spanning-tree loop.

Highlighted
Beginner

Re: Double Up-Link configration

Hello Leo sir, thanks for the replay, can you please provide the configure
commands and please note that, i didn't configure any IP to brunch
locations switch.

Highlighted
Beginner

Re: Double Up-Link configration

Its not solve yet i'm trying with the following link as per your suggestion: 

 

https://networklessons.com/spanning-tree/spanning-tree-loopguard-udld/

 

 

Highlighted
Hall of Fame Community Legend

Re: Double Up-Link configration

Draw a diagram of the network.
Highlighted
VIP Mentor

Re: Double Up-Link configration

There are 2 way to Fix this issue.

 

If you looking for bigger bandwidth you can do as below :

 

1. If the L2 make a Port-channel.

https://www.cisco.com/c/en/us/support/docs/lan-switching/etherchannel/12028-68.html

 

You can also do below option :

 

2. you can also do other option using IGP with OSPF,

 

choose which one suites your needs

 

BB

 

 

BB
*** Rate All Helpful Responses ***
Highlighted

Re: Double Up-Link configration

Hi dude:

As far as I see, maybe is an STP Problem. In fact, you can check the status of STP with these commands on Cisco 2960:

 

Globally
show spanning-tree

show spanning-tree summary

 

Interface
show spanning-tree interface Gi0/0

 

Vlan

show spanning-tree vlan 1

 

In addition, you can try to configure STP and SG300 following the steps from that guide:

 

https://www.voipsupply.com/downloads/dl/file/id/149/cisco_300_series_switches_admin_guide.pdf

 

Also, you can try with Etherchannel on both sides , check this link:

https://pinoyittechnotes.wordpress.com/2016/06/16/lacp-between-catalyst-and-sg300-series-switches/

 

Kind Regards.

 

If my advice was useful, please do not forget to say Thank you :) with a star.

 

 

 

Highlighted
Beginner

Re: Double Up-Link configration

Thanks bro, I'm busy with another project, so could't able to try this right now, but I need to configure the path, i hope Ill do it with all your help.. thanks for your time and consideration.. 

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