dualstack support for underlay

afischer1-godaddy commented 1 year ago

Enhancement summary

Currently there is only the option to use an RFC5549 based IPv6 only underlay OR an IPv4 only underlay. Both address families together as dualstack (IPv4+IPv6) underlay is not natively supported as of now.

Which component of AVD is impacted

eos_designs

Use case example

Many DCs started with an access-distribution-core setup and a single routing table which is fine for a small environment but hit scale limits when growing. For uplifting such networks to modern design but sticking with the single routing table (with IPv4+IPv6) without any VRFs the option for a dual stack underlay would come in handy.

Describe the solution you would like

With the following set I would expect both IPv4 and IPv6 underlay to be present in the config:

underlay_ipv6: true

# for the individual roles of devices
uplink_ipv4_pool: <IPv4-subnet>
uplink_ipv6_pool: <IPv6-subnet> # or a link-local alternative

This would result in interface config with IPv4 and IPv6 addresses + BGP sessions for IPv4 and IPv6 carrying only their address families prefixes. This does not involve any overlays.

Describe alternatives you have considered

Before trying to mess with uplink_structured_config and custom_structured_configuration using a single overlay comes to mind but would make it a more than necessary complex setup.

Additional context

No response

Contributing Guide

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github-actions[bot] commented 1 year ago

This issue is stale because it has been open 90 days with no activity. The issue will be reviewed by a maintainer and may be closed

MTWiley commented 5 months ago

+1

github-actions[bot] commented 2 months ago

This issue is stale because it has been open 90 days with no activity. The issue will be reviewed by a maintainer and may be closed

aristanetworks / avd