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Why Spanning-Tree Port ty...

Why Spanning-Tree Port type facing cisco switch incorrect (STP instead MSTP)?

Created: Aug 30, 2019 19:23:51Latest reply: Sep 30, 2019 19:50:34 160 5 0 0
  Rewarded Hi-coins： 0 (problem resolved)
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Hi,

I've core cisco switch with custom priority 4096, because I always want to be it root bridge, and several downstream huawei devices which are non root bridges.

I'm running MSTP on all switches.

NX-OS-1# show spanning-tree brief
MST0000
Spanning tree enabled protocol mstp
Root ID Priority 4096
...
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
...
Eth1/20 Desg FWD 2000 128.130 P2p Bound(PVST)

Downstream Huawei shows Port STP Mode :STP on link facing to Eth1/20

-------[CIST Global Info][Mode MSTP]-------

----[Port3(XGigabitEthernet0/0/1)][FORWARDING]----
Port Protocol :Enabled
Port Role :Root Port
Port Priority :128
Port Cost(Dot1T ) :Config=auto / Active=2000
Designated Bridge/Port :4096.002a-6a60-d101 / 128.130
Port Edged :Config=default / Active=disabled
Point-to-point :Config=auto / Active=true
Transit Limit :6 packets/s
Protection Type :Loop
Port STP Mode :STP


Another non Huawei facing port on cisco device are simple P2p.

Huawei to Huawei port types are MSTP.

How to configure Huawei STP correctly to set port facing cisco to MSTP.

MSTPCisco Huawei
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chenhui
Admin Created Aug 31, 2019 01:13:57 Helpful(0) Helpful(0)

@Dzyan hello,
STP protocol programing by Huawei and Cisco are different. Huawei programs the STP protocol based on the standard IEEE protocol, while Cisco made some changes.
Briefly, the destination MAC address of the STP packets are different for Huawei and Cisco, so the STP negotiation may have a minor problem.

Please try confiugring stp config-digest-snoop on the connection interface of the Huawei and Cisco.
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All Answers
chenhui
chenhui Admin Created Aug 31, 2019 01:13:57 Helpful(0) Helpful(0)

@Dzyan hello,
STP protocol programing by Huawei and Cisco are different. Huawei programs the STP protocol based on the standard IEEE protocol, while Cisco made some changes.
Briefly, the destination MAC address of the STP packets are different for Huawei and Cisco, so the STP negotiation may have a minor problem.

Please try confiugring stp config-digest-snoop on the connection interface of the Huawei and Cisco.
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  • convention：
Dzyan
Dzyan Created Sep 2, 2019 08:58:03 Helpful(0) Helpful(0)

Hi, Thanks for information.
May I ask some more.
I have three connections from huawei to cisco root and only two has incorrect port type.
I found that my domains has the same region digest:
<Huawei>display stp region-configuration digest
 Oper configuration
   Format selector    :0            
   Region name        :341e6b1a94a0            
   Revision level     :0
   Digest             :0xAC36177F50283CD4B83821D8AB26DE62

CiscoNX-OS# show spanning-tree mst configuration digest
Name      []
Revision  0     Instances configured 1
Digest          0xac36177f50283cd4b83821d8ab26de62
Pre-std Digest  0xbb3b6c15ef8d089bb55ed10d24df44de

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chenhui
chenhui Admin Created Sep 2, 2019 11:11:47 Helpful(0) Helpful(0)

Posted by Dzyan at 2019-09-02 08:58 Hi, Thanks for information.May I ask some more.I have three connections from huawei to cisco root an ...
from you output, the region name seems to be different on the two terminals.
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Dzyan
Dzyan Created Sep 30, 2019 19:40:09 Helpful(0) Helpful(0)

Addition if i may, please.

Huawei>display stp region-configuration
Oper configuration
Format selector :0
Region name :Brew
Revision level :7

Instance VLANs Mapped
0 1 to 4094

nx-ox# show spanning-tree mst configuration
Name [Brew]
Revision 7 Instances configured 1
Instance Vlans mapped
-------- ---------------------------------------------------------------------
0 1-4094
-------------------------------------------------------------------------------

But ports on cisco and huawei are:
Eth1/2 Desg FWD 2000 128.130 P2p Bound(PVST)
Eth1/3 Desg FWD 2000 128.131 P2p Bound(PVST)




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Dzyan
Dzyan Created Sep 30, 2019 19:50:34 Helpful(0) Helpful(0)

digest are the same
_Huawei]display stp region-configuration digest
Oper configuration
Format selector :0
Region name :Brew
Revision level :7
Digest :0xAC36177F50283CD4B83821D8AB26DE62

# show spanning-tree mst configuration digest
Name      [Brew]
Revision  7     Instances configured 1
Digest          0xac36177f50283cd4b83821d8ab26de62
Pre-std Digest  0xbb3b6c15ef8d089bb55ed10d24df44de



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