Help with a 5130 and stp

[Eslovs_Kommun]

Hi all.
We have a fairly big layer 2 network with 2 HPE 5940 in irf as Core and STP is activated, root, with 2 instances
instance 0, all vlans exept 1 wich is our management vlan for the switches, that vlan has it own instance, 1.
We also got 2 HPE 5940´s in irf as distribution and they are set as secondary root. All other switches are HP procurve and Arubas.
Now i´m going to set a HPE 5130 as a distribution swith on one of our schools, it´s going to have a connection directly to the core and to end switches. The STP Global command is active from start so it should be fine, but when i connect the switch to our network i see in our IMC that it cannot ping the switches in our network and i PANIC, i disconnect the switch and everything is going up again.
Is it the spanning tree that calculates?
Why do i lose "ping" to the other switches, that doesn´t happend when we put in a new Aruba switch?
Is there anything i can do to prevent the the calculation IF it is that that couses the "ping drop"?

Our config:

<CORE>disp stp region-configuration
Oper Configuration
   Format selector      : 0
   Region name          : 40b93cb4ad0e
   Revision level       : 1
   Configuration digest : 0x5a4888077dc107af56c4e5330978d769

   Instance  VLANs Mapped
   0         1 to 899, 901 to 4094
   1         900

<CORE>disp stp instance 0
-------[CIST Global Info][Mode MSTP]-------
Bridge ID           : 0.40b9-3cb4-ad0e
Bridge times        : Hello 2s MaxAge 20s FwdDelay 15s MaxHops 20
Root ID/ERPC        : 0.40b9-3cb4-ad0e, 0
RegRoot ID/IRPC     : 0.40b9-3cb4-ad0e, 0
RootPort ID         : 0.0
BPDU-Protection     : Disabled
Bridge Config-Digest-Snooping     : Disabled
Root type           : Primary root
TC or TCN received  : 13378
Time since last TC  : 0 days 0h:15m:15s 

<CORE>disp stp instance 1

-------[MSTI 1 Global Info]-------
Bridge ID           : 32768.40b9-3cb4-ad0e
RegRoot ID/IRPC     : 32768.40b9-3cb4-ad0e, 0
RootPort ID         : 0.0
Master bridge       : 0.40b9-3cb4-ad0e
Cost to master      : 0
TC received         : 0

On the Distribution sw:

<STH-SRV-DIST>disp stp region-configuration
Oper Configuration
   Format selector      : 0
   Region name          : 40b93cb4bbc0
   Revision level       : 1
   Configuration digest : 0x5a4888077dc107af56c4e5330978d769 

   Instance  VLANs Mapped
   0         1 to 899, 901 to 4094
   1         900

<STH-SRV-DIST>disp stp instance 0
-------[CIST Global Info][Mode MSTP]-------
Bridge ID           : 4096.40b9-3cb4-bbc0
Bridge times        : Hello 2s MaxAge 20s FwdDelay 15s MaxHops 20
Root ID/ERPC        : 0.40b9-3cb4-ad0e, 1
RegRoot ID/IRPC     : 4096.40b9-3cb4-bbc0, 0
RootPort ID         : 128.74
BPDU-Protection     : Disabled
Bridge Config-Digest-Snooping     : Disabled
Root type           : Secondary root
TC or TCN received  : 36673
Time since last TC  : 0 days 0h:16m:9s 

<STH-SRV-DIST>disp stp instance 1
-------[MSTI 1 Global Info]-------
Bridge ID           : 32768.40b9-3cb4-bbc0
RegRoot ID/IRPC     : 32768.40b9-3cb4-bbc0, 0
RootPort ID         : 0.0
Master bridge       : 4096.40b9-3cb4-bbc0
Cost to master      : 0
TC received         : 0

Am i assuming correct that Core and Dist switch are not root for instance 1, it is the STP that desides hwo will be the root?

[TerjeAFK]

You say that this school has a direct connection to the core and end switches. Does that mean a layer 2 connection, ie. no routing?

What does the 'display stp root' command say on the core and dist switches? What is the STP config on the school distribution switch?

[Eslovs_Kommun]

Thanks for the respond.

Yes, it´s layer 2 all the way. The core does the inter vlan routing.

<CORE>display stp root
MST ID Root Bridge ID ExtPathCost IntPathCost Root Port
0 0.40b9-3cb4-ad0e 0 0
1 32768.40b9-3cb4-ad0e 0 0

And the Distribution

<STH-SRV-DIST>display stp root
MST ID Root Bridge ID ExtPathCost IntPathCost Root Port
0 0.40b9-3cb4-ad0e 1 0 HGE1/0/54
1 32768.40b9-3cb4-bbc0 0 0

The stp config on the school dist switch is just:
stp Global enable
So it shows only: 
<EKS--SW01>disp stp root
MST ID Root Bridge ID ExtPathCost IntPathCost Root Port
0 32768.943f-c2a3-60ee 0 0

I don´t want to connect this switch to the network, if i can avoid it until i´ve sorted this out, because i know we have a couple of radio links that goes down when i connect it and i have to drive to the site and restart it.

[Eslovs_Kommun]

Don´t know what the problem was, but it has been sorted.
Wiped the switch and began from scratch, did a sw update and shut of the STP. Tried to connect it and it was working fine. Started the STP and no "hick up". Finished the configuration and now it works.