#3058 amfd: add support for dynamically modifying saAmfRank of SaAmfSIRankedSU

[Alex Jones]

Add support for modifying saAmfRank of SaAmfSIRankedSU class.

This is useful in the following case. You have two geographically separated sites. You want to have the concept of an active site, and a standby site. You also have 2 nodes in each site (4 total), because you want to always fail to the other local node if possible. Only if you can't fail locally do you want to fail to the other site.

This can be accomplished using an N-way service group across the two sites. You can configure 1 SI which is active on one node and standby on the other 3. You can setup the 2 SUs in site A, one on each node, to have the same rank in SaAmfSIRankedSU objects. You set up the other 2 SUs at the other site, one on each node, to have a lower rank. This way failovers will always have local preference.

When a site failover occurs, this is where modifying saAmfRank is needed. Now you need to change the rank of the SUs in the previously active site, so that AMF doesn't fail back to the other site before trying to fail locally.

[Alex Jones]

commit 67adee120aa91541641014a15606d89eb339629a (HEAD -> develop, origin/develop
)
Author: Alex Jones ajones@rbbn.com
Date: Mon Aug 5 11:22:47 2019 -0400