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Connecting 2 core switches - both cisco 3650's

Posted on 2012-03-20
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Hi Experts,

I need to connect 2 core switches (both cisco 3650's) in 2 different buildings that are connected through F/O, the switches are not connected physically or logically yet. Below are some details and questions.

- EP1= existing running site with 2 vlans
- EP2= new site
- Task is to extend EP1 to EP2
- Planing to physically connect the 2 switches with 2 F/O media converters to an Ethernet  port on each switch
- My understanding is that I'll have to configure on the port that I have connected the media converter as a "trunk" to enable the 2 switches to talk and pass through all vlan communication, do I configure both ports on both switches as trunk or just one?
- Do the trunk ports need IP address's?
- if anyone has commands to do the truncking that would be great

If I'm missing anything or you have suggestions that would help that would be great. Cheers
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Question by:WeirdFishes
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by:
Don Johnston earned 501 total points
ID: 37745386
- My understanding is that I'll have to configure on the port that I have connected the media converter as a "trunk" to enable the 2 switches to talk and pass through all vlan communication

Correct

do I configure both ports on both switches as trunk or just one?

Both

Do the trunk ports need IP address's?

No. Trunk ports are layer 2. No IP addresses can be assigned to Layer 2 ports.

if anyone has commands to do the truncking that would be great

switchport mode trunk
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by:mat1458
mat1458 earned 501 total points
ID: 37745972
- Planing to physically connect the 2 switches with 2 F/O media converters to an Ethernet  port on each switch
It's not necessary to use FO converters since the 3560 have so called SFP ports in which you can plug Multi Mode or Single Mode SFP adapters that directly connect to your fiber optic cable. Look for GLC-SX-MM or GLC-LH-SM.

- My understanding is that I'll have to configure on the port that I have connected the media converter as a "trunk" to enable the 2 switches to talk and pass through all vlan communication, do I configure both ports on both switches as trunk or just one?

If you configure the ports as trunks, then you have to configure both. If you do not configure them they automatically find out that they have to be trunk.

- Do the trunk ports need IP address's?

As donjohnston said: no.

- if anyone has commands to do the truncking that would be great
See donjohnston
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by:InteraX
InteraX earned 498 total points
ID: 37746731
On the trunk commands, depending on the version of IOS you are running, I would reccomend issuing the following command on the trunk links before the switchport mode trunk.

switchport trunk encapsulation dot1q

This means that the trunk link will now be using 802.1q encapsulation and not auto or ISL. This command has been deprecated in IOS15.
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by:Don Johnston
ID: 37746752
802.1q trunking is the default trunking protocol of 3560's (unless running version 15 code in which case ISL is no longer supported).
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by:InteraX
ID: 37748332
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by:WeirdFishes
ID: 37750541
@ mat1458

All the other SFP ports are already in use therefore the need for a media converter. I'll be receiving the  extra switch in a couple of days and I will update the question appropriately. Cheers
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by:mat1458
ID: 37751176
Do they connect to other switches or to end systems? Fiber or copper? Can you add a show interface status for both switches?
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