[cisco-voip] 8865s and MRA CUCM registration failover issue

[Erick Bergquist]

Pair of expressways, clustered.  DX 70/80s happen to work fine with
all 3 over MRA.

On Wed, Oct 30, 2019 at 1:13 PM Ryan Ratliff (rratliff)
<rratliff at cisco.com> wrote:
>
> IIRC (it's been a looong time since I looked into this) failover with RMA was based on device->Expressway-E redundancy, not so much Expressway->CUCM.
> This is why you don't get any redundancy without a clustered Expressway.
>
> I'd recommend treating it as a bug and pushing for one to be created. If you have two Expressway-Es in the cluster (and the phone knows this via DNS lookups) then it should maintain connections to an active and standby CUCM.
>
> If anyone happens to have a cluster of 3 Expressways to test with, I wonder how that would look.
>
> - Ryan
>
> On 10/30/19, 2:57 PM, "cisco-voip on behalf of Erick Bergquist" <cisco-voip-bounces at puck.nether.net on behalf of erickbee at gmail.com> wrote:
>
>     Following up on this, still working to figure this out and have been
>     working with TAC.
>
>     Does anyone know if the 8865s when using MRA use only the first 2
>     servers in UCM group or will also the third server if present?
>
>     On the 8865 phone web page it shows all 3 servers from UCM group.
>
>     On the phone information page on phone itself, it shows the Active
>     Server and Stand-by Server only.
>
>     When we make the first server unreachable (CCM1) the 8865 over MRA
>     fails to second server CCM2 fine and the phone information screen
>     shows CCM1 as Active Server and the Stand-by Server field is empty.
>     The web page of phone shows all 3 servers still with CCM2 as Active.
>     When we make CCM2 unreachable the phone just spins and never goes to
>     the third server over MRA.  Phones on-premise use the third server
>     fine.
>
>     I can not find any documentation on this and so far no one seems to
>     really have an answer if 88xx phones over MRA will use the third
>     server in UCM group.
>
>     Thanks.
>
>     On Mon, Oct 14, 2019 at 12:25 PM Erick Bergquist <erickbee at gmail.com> wrote:
>     >
>     > Thanks, I've seen that bug before (and another cisco doc) and that bug
>     > says fixed in 8.11.x which we are on.
>     >
>     > All 3 CUCMs are in our SRV records and show active on the Expressway side.
>     >
>     > On Mon, Oct 14, 2019 at 12:04 PM Brian Meade <bmeade90 at vt.edu> wrote:
>     > >
>     > > You're may be hitting this limitation-  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvj49486
>     > >
>     > >
>     > > If not, are all 3 CUCM servers in the _cisco-uds SRV record and resolvable by the Expressway-C?
>     > >
>     > > On Mon, Oct 14, 2019 at 11:47 AM Erick Bergquist <erickbee at gmail.com> wrote:
>     > >>
>     > >> Has anyone seen where 8865 model phones don't register over MRA  in
>     > >> the UCM group if the some servers are not reachable?
>     > >>
>     > >> 8865s with 12.5.1 SR3 firmware
>     > >> 12.5.1 SU1 CUCM
>     > >>
>     > >> 2 expressway pairs
>     > >>
>     > >> UCM group order (same as service group),
>     > >>
>     > >> CCM1
>     > >> CCM2
>     > >> CCM3
>     > >>
>     > >> When CCM1 and CCM2 are unreachable the MRA 8865 phone just spins at registering.
>     > >> Once CCM1 or CCM2 become reachable, the phone comes backs up.
>     > >>
>     > >> DX 70's and DX 80's register fine when CCM3 is only available over MRA.
>     > >>
>     > >>
>     > >> Thanks,
>     > >> Erick
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