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The answer to this was given slightly later in the same post. How can the DHCP offer be directed to the Edge that actually sourced the DHCP discover? Essentially, the same VLAN and IP address mapping will exist across all Edge’s. In that post, I stated:Īnd here’s the second major problem that DHCP needs to deal with in SD-Access - this ‘giaddr’ address is essentially the interface VLANs IP address, which (as you might have guessed it) is the anycast gateway IP address across all Edge’s. Why do we do this? Remember when we talked about how DHCP works with SDA and the need for option82? Well, this ties directly into that. Look at the following configuration snippets from an edge and a border: // Border1ĭescription Configured from Cisco DNA-Center Interestingly enough, the same IP address is also mapped to a loopback interface on the borders of the fabric (one loopback on the border for every SVI created on the edge). Since a SDA fabric implements an anycast gateway type SVI across all edges, you would see the same IP address to SVI mappings created on all your edges in the fabric. Let’s consider the following topology for this: This post aims to demystify these and help the reader understand why these were needed in the first place, hopefully giving you a better understanding of how the SDA fabric is built. Looking at the some of the configuration that is automatically pushed from DNAC, you should spot some very interesting things in there.

I would appreciate all the help I can get.In this post, we look at why SD-Access borders have the anycast IP addresses configured as loopback addresses. Track interface GigabitEthernet0/1 state Down decrement 10ħ state changes, last state change 00:00:18 Local virtual MAC address is 001 (v2 default) Below I will copy and paste the #show standby command:Ħ state changes, last state change 00:00:18Īctive virtual MAC address is 001 Im trying to configure HSRP so that when R1 fails, R2 will save the day. All opinions stated are those of the poster only, and do not reflect the opinion of Cisco Systems Inc., or its affiliates. NOTE: The "Reddit Cisco Ring", its associates, subreddits, and creator "mechman991" are not endorsed, sponsored, or officially associated with Cisco Systems Inc.

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