Double Up-Link configration

[hasim]

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.

[Leo Laohoo]

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@hasim wrote:

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

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Spanning-tree loop.

[hasim]

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.

[hasim]

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

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

[Leo Laohoo]

Draw a diagram of the network.

[balaji.bandi]

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

[Julio A. Martinez Herrera]

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.

[hasim]

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..