Sunday, January 9, 2022

Running OSPF over Unnumbered Ethernet Interfaces

Remember the unnumbered IP interfaces saga? Let’s conclude it with the final challenge: can we run link-state routing protocols (OSPF or IS-IS) over unnumbered interfaces?

Quick answer: Sure, just use IPv6.

Cheater! IPv6 doesn’t count. There are no unnumbered interfaces in IPv6 – every interface has at least a link-local address (LLA). Even more, routing protocols are designed to run over LLA addresses, including some EBGP implementations, allowing you to build an LLA-only network (see RFC 7404 for details).

OK, what about IPv4?

TL&DR: It works, but…



source https://blog.ipspace.net/2022/01/ospf-unnumbered.html?utm_source=atom_feed

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