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I am currently doing an enterprise campus network which consist of Three Tier hierarchy and a simple MPLS design.

Currently, I'm stucked at HSRP configuration on the Core Layer to the Edge Router. Core Layer has 2 interfaces connected to the Edge Router. However, in order to do HSRP, both sides have to be in L3 and in the same subnet as well.

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Core E4/2 and E4/3 is connected to CE1 and CE2. How do i assign IP addresses in the same subnet for the Core interfaces so as to allow HSRP to work?

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    Why do you need HSRP? They’re all routers , right?
    – Ron Trunk
    Jun 25, 2022 at 22:25
  • In the event if any router goes down, the backup router will kick in to provide default gateway redundancies
    – ccnanewb99
    Jun 25, 2022 at 22:28
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    That is what routing protocols do, much faster than HSRP.
    – Ron Maupin ♦
    Jun 25, 2022 at 22:54

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Currently, I'm stucked at HSRP configuration on the Core Layer to the Edge Router. Core Layer has 2 interfaces connected to the Edge Router.

Layer-3 switches are routers too. You do not run HSRP between the routers. You should have different layer-3 routed links in different networks. You run a routing protocol, e.g. OSPF, and it will know when a link goes down and move to the backup. A routing protocol is much, much faster than HSRP to fail over.

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