Distribution Point Offline - how long before SCCM client connects to alternative DP?

Hi, I'm doing some testing on my SCCM 2012 setup and have been attempting to test distribution point resiliency and fall-back.
I have a single primary site with two distribution points. One is in the main datacentre and is in the same boundary group as the clients and tagged as fast connection. The 2nd DP is in the DR datacentre, in a separate boundary group (no client subnets are
in this group) and the distribution point has the allow failback checked.  Both DP's have the same content.
After shutting down/taking offline the main distribution point, I've then kicked of an install of a package on a W7 client. It attempts to download and stays in that state for as long as I leave it. Looking in the logs I can see both DP's returned to
the client (the DR tagged as REMOTE), it then attempts to connect to the main DP and just keeps retrying over and over.
I thought if it couldn't connect to the main DP it would then failback to the DR DP, but it doesn't appear to do this. Is there a timeout on this before it would fail back?
I'm also currently  trying adding the DR DP to the main boundary group and tagging the connection as slow so the main DP would still be used first. Again both DP's are returned to the client when installing software and the client attempts to connect
to the main DP over and over without using the DR DP which is online.
Is this normal behaviour or do I have a configuration issue?
Appreciate your help.
Carl

Hi, just to update on this thread, I raised a support call with Microsoft and the end result is that SCCM2012 clients wont fall back to an alternative DP where a DP is offline. The fall back is only for when content isn't on a DP. The 8hr timeout doesn't
appear to be in affect anymore.
What I have managed to get to work and test out is removing our production DP (also primary site server) from the production content boundary group, then clients will fall back to the DR DP as this is the only other DP available with content.
I've managed to perform the update to remove the site server from the boundary group while the primary site server is offline, by using a PowerShell script to connect to the SCCM provider on the DR site server (DP/MP/SUP) to perform the update as our site
database is off-box. This works well and the changes replicate to the SQL replica in DR that the DR MP uses and when clients failover to the DR MP they then begin using the DR DP and packages can be installed etc.
How funny, I just fixed this at a Client this week.
This is default client behavior as MS CSS probably told you, the client thinks the Distribution Point is coming back online soon so it waits, for good reasons. For some reason I keep thinking "7 days" not 8 hours, but maybe wrong.
I have a work around for this, it just requires a change to the Distribution Points DNS record. Head to the DNS server, find the record for the Distribution Point that is down, change the IP address to a different member server IP address, this will cause
the client, when it flushes it's DNS cache, to get an updated DNS record for the Distribution Point and it will try to connect to the Distribution Point using the changed IP address, which then induces what the client thinks is a severe error which makes it
go to the next Distribution Point in the list it got from the Management Point. Once you've recovered the Distribution Point and it is back online, change it's IP address back in DNS or just let the Distribution Point update its own DNS record when it boots
up (if configured to do so) and viola, you are back in business.
Test, test and test again before ever putting something from "the web" into your production environment. I just implemented this at a client to solve their issues with their DR procedure.
Rob Marshall | UK | My Blog |
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