10-07-2020 06:38 AM - edited 10-07-2020 06:40 AM
Hello,
I am currently setting up a new network at my company and have a question about my design. We have 2 buildings side by side with fiber between the buildings. I bought 4 9500's for the core and have set up 2x2 as stackwise stacks for a collapsed core configuration. My question is, originally, I thought I would do a layer 3 port channel between them and route traffic between buildings but now I'm not so sure. I was reading about multichassis etherchannel and that seems like it might be the way to go. There are not separate networks in each building, they use the same vlans. I might change that in the future but for now, they will be the same.
Each building will have its own internet connectivity and be a backup for the other building and it just seemed logical to use routing but it seems that I can put both virtual domains in an etherchannel and that will serve the same purpose and be more efficient. Recommendations? Thanks!
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10-07-2020 11:22 AM
NetworkEngineer
The original diagram was correct with respect to FW to SWV connections. I just looked at it incorrectly.
The connection from SWV 1 to SWV 2 will be 4 links, either using ECMP or L3 Multi-Chassis EtherChannel.
Cheers,
Scott Hodgdon
Senior Technical Marketing Engineer
Enterprise Networking and Cloud Group
10-07-2020 06:56 AM
Worth deploy 2 X stackwise virtual and make them different VLAN segment for their own internet segment.
make sure you have right license to deploy stackwise virtual, if no this require re-design.
10-07-2020 07:39 AM
Thank you for the reply. I have 2 of the switches in stackwise virtual domain 1 and 2 switches in virtual domain 2 so they are configured for stackwise virtual. Are you saying I need to create a L3 transit vlan between the stacks and route between them? If so, that was my initial design but it seems that with multichassis etherchannel between the stacks, I wouldn't need to do that. Is that correct?
10-07-2020 08:01 AM
yes for the L3 traffic you like to exchange -
for your stack they stay respected SVL domain and using Transit link to go otehr side ?
make a smalll HLD diagram so you are clear with goals.
10-07-2020 09:30 AM
10-07-2020 10:13 AM
NetworkEngineer
If you are going to directly connect the two SWV , you should make sure they are cross-connected with 4 links. This is the Best Practice for connect two SWV domains. In your picture, you have just 2 connections between the two SWV domains. Whether you use L3 PortChannel or Equal Cost Multi-Path (ECMP) routing between the two domains is up to you.
Looking at your picture, you should also cross connect your WAN devices to each of the SWV members in a domain instead of connecting each WAN device with two connections to a single member of the SWV domain.
Every device that connects to a SWV domain should connect to each of the SWV domain members if possible.
Cheers,
Scott Hodgdon
Senior Technical Marketing Engineer
Enterprise Networking and Cloud Group
10-07-2020 10:43 AM
Thanks for the reply Scott. So you are saying I should have 2 ports on each switch in each SWV for uplinks to each other? I will have to look and make sure I have enough fiber pairs. I should, there should be 6 in the cable.
My diagram must not be clear, I will have 1 port from each switch to go to each firewall. I tried to color code them so it would be easier to read haha. I also plan to make those L3 port-channels for redundancy and routing. I made a rudimentary drawing that may better illustrate what i'm trying to do
10-07-2020 11:22 AM
NetworkEngineer
The original diagram was correct with respect to FW to SWV connections. I just looked at it incorrectly.
The connection from SWV 1 to SWV 2 will be 4 links, either using ECMP or L3 Multi-Chassis EtherChannel.
Cheers,
Scott Hodgdon
Senior Technical Marketing Engineer
Enterprise Networking and Cloud Group
10-07-2020 12:05 PM
Ok, thank you for your advice, that's what I needed to know. I have setup a L3 port-channel between the SWV's with routing via ospf and its working but i'm blowing it away and starting over.
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