[RFE] MetalLB Support for RFC 8092 BGP Large Communites

1. Proposed title of this feature request

[RFE] MetalLB Support for RFC 8092 BGP Large Communites

2. What is the nature and description of the request?

4 byte ASN support was added to MetalLB

https://bugzilla.redhat.com/show_bug.cgi?id=2097701#c2

4-byte ASN does not natively interoperate with BGP Communities as specified by RFC1997.

RFC 8092 should work with 4 byte ASNs, but it seems like MetalLB does not support this at the moment.

It looks like FRR supports Large Communities already

https://docs.frrouting.org/en/latest/bgp.html#large-communities-attribute

3. Why does the customer need this? (List the business requirements here)

• At this time no active request

4. List any affected packages or components.

MetalLB and MetalLB operator