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05-11-2020 09:03 AM
Hello,
So I am standing up a new Layer 3 LAN with all connections being Layer 3 connections. The goal is to have two layer 3 core switches and several user access switches with a connection back to both cores.
When using layer 2, I know you can use VPC between cores and then use HSRP to point traffic to one Core or the other, and when one Core fails traffic will automatically re-direct to the the second core. However, When it comes to Layer 3, this is not a viable option.
Is there a protocol I can use between the two Layer 3 core switches and the Layer 3 user access switches, which will provide load balancing and redundancy? I was looking at GLBP as a possible solution but I am not sure how the configs would work on the user access switches. I have provided an image to give an idea of what I am talking about.
Any help would be appreciated.
Thanks,
Matt
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05-11-2020 11:05 AM
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05-11-2020 09:10 AM
Hello
Are those two L3 Nxos switches going to be in a VPC domain?
Do you require a L2 exteneded vlan design or can the acces-Layer also be L3?
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Kind Regards
Paul
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05-11-2020 10:20 AM
Hello Paul,
There will be no VPC domain involved on the Nxos'. The access layer will also be layer 3 (interfaces with ips and layer 3 interface vlans).
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05-11-2020 09:37 AM
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05-11-2020 10:21 AM
Hello Joseph,
So are you saying that I should use a Dynamic routing protocol between the user access switches and the cores and MHSRP between the two cores?
Thanks,
Matt
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05-11-2020 11:05 AM
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05-11-2020 12:59 PM
Matt
thanks for the drawing. It clearly shows the access switch as a layer 3 switch with layer 3 links to 2 core switches. Assuming this is correct I would certainly suggest running a dynamic routing protocol (EIGRP, OSPF, etc) between the access switch and each core switch. As @Joseph W. Doherty points out this should provide equal cost load sharing and would provide failover to the surviving switch if there was a failure on a core switch.
Rick
