[Lisp] Map Replay overlapping EID-Prefix. RFC 6830

Americo Massotti — Tue, 12 Nov 2019 10:27:37 GMT

sdaHello guys.

I'm reading the RFC 6830 about the Lisp protocol.

I have a doubt about the Map replay about a EID overlapping prefix.

The RFC (Section 6.1.5.) said:

When an ETR is configured with overlapping EID-Prefixes, a
Map-Request with an EID that best matches any EID-Prefix MUST be
returned in a single Map-Reply message. For instance, if an ETR had
database mapping entries for EID-Prefixes:

10.0.0.0/8
10.1.0.0/16
10.1.1.0/24
10.1.2.0/24

A Map-Request for EID 10.1.1.1 would cause a Map-Reply with a record
count of 1 to be returned with a mapping record EID-Prefix of
10.1.1.0/24.

A Map-Request for EID 10.1.5.5 would cause a Map-Reply with a record
count of 3 to be returned with mapping records for EID-Prefixes
10.1.0.0/16, 10.1.1.0/24, and 10.1.2.0/24.

Note that not all overlapping EID-Prefixes need to be returned but
only the more-specific entries (note that in the second example above
10.0.0.0/8 was not returned for requesting EID 10.1.5.5) for the
matching EID-Prefix of the requesting EID.

To be honest, I cannot understand why a 10.1.5.5 request should receive 10.1.1.0/24 and 10.1.2.0/24.

The address not fall in these two address.

Thanks a lot and have a nice day.

Americo

topic [Lisp] Map Replay overlapping EID-Prefix. RFC 6830 in Software-Defined Access (SD-Access)

[Lisp] Map Replay overlapping EID-Prefix. RFC 6830