M3UA AS override mode from SGP perspective

Hi,

It is not obvious for me how the M3UA "Override mode" should be understood from the description in RFC4666 (ch. 4.3.4.3).

Consider the following configuration: Local side is SG and it has two SGPs each connected with two remote ASPs. Note that both SGPs are handled by the same SW process! The consideration is within the same AS, which is served by all 4 ASPs:

Local Side                         Remote Side
                                   +------------+
              -------assoc11-------|ASP_1       |
+----------+ /                     |            |
|     SGP_1| --------assoc12-------|ASP_2       |
|          |                       |            |
| SG       |                       |        AS  |
|          |                       |            |
|     SGP_2| --------assoc23-------|ASP_3       |
+----------+ \                     |            |
              -------assoc24-------|ASP_4       |
                                   +------------+

If the AS works in an Override mode, then how many associations (max) may be simultaneously active in this configuration? I see two options:

Option 1. There can be only one association active within the AS at the same time. So if any of the remote ASPs activates, all other ASPs will receive Notify(Alternative ASP active).

Option 2. There can be two associations active within the AS at the same time: one of {assoc11, assoc12} and one of {assoc23, assoc24}. So activation of ASP_1 or ASP_2 does not affect SGP_2.


BR/ Mikhail