Thanks for your reply. To config trunk mode as "general" did not make difference. I configed both Cisco and Dell to run MSTP as suggested by Dell docu, and also upgraded Dell7048P to the latest code (5.1.10.1). The issue I am seeing is that both Cisco and Dell claim as root bridge on each instance of MST (except instance 0). Not sure why MST did not work between Cisco and Dell. I am scratching my head. Much appreciated if you can provide some idea.
MST0 Spanning tree enabled protocol mstp Root ID Priority 8192 Address a055.4f1c.0e00 Cost 0 Port 2027 (Port-channel1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 12288 (priority 12288 sys-id-ext 0) Address f0b2.e580.2d00 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
MST1 Spanning tree enabled protocol mstp Root ID Priority 8193 Address f0b2.e580.2d00 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 8193 (priority 8192 sys-id-ext 1) Address f0b2.e580.2d00 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
MST2 Spanning tree enabled protocol mstp Root ID Priority 8194 Address a055.4f1c.0e00 Cost 5000 Port 2027 (Port-channel1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 12290 (priority 12288 sys-id-ext 2) Address f0b2.e580.2d00 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
###### MST 0 Vlan Mapped: 103, 4093 ROOT ID Priority 8192 Address A055.4F1C.0E00 Path Cost 6666 Root Port Po30 Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 16384 Address D067.E59E.D52E Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec Interfaces
Name State Prio.Nbr Cost Sts Role RestrictedPort ------ -------- --------- --------- ---- ----- -------------- Gi1/0/3 Enabled 128.3 20000 FWD Desg No Gi1/0/6 Enabled 128.6 20000 FWD Desg No --More-- or (q)uit Gi1/0/21 Enabled 128.21 20000 FWD Desg No Gi1/0/22 Enabled 128.22 20000 FWD Desg No Gi1/0/23 Enabled 128.23 20000 FWD Desg No Gi1/0/39 Enabled 128.39 200000 FWD Desg No Gi1/0/40 Enabled 128.40 200000 FWD Desg No Gi1/0/41 Enabled 128.41 20000 FWD Desg No Gi1/0/42 Enabled 128.42 20000 FWD Desg No Gi1/0/45 Enabled 128.45 20000 FWD Desg No Gi1/0/48 Enabled 128.48 200000 FWD Desg No Gi2/0/5 Enabled 128.61 20000 FWD Desg No Gi2/0/21 Enabled 128.77 20000 FWD Desg No Gi2/0/22 Enabled 128.78 20000 FWD Desg No Gi2/0/23 Enabled 128.79 20000 FWD Desg No Gi2/0/39 Enabled 128.95 200000 FWD Desg No Gi2/0/41 Enabled 128.97 200000 FWD Desg No Gi2/0/44 Enabled 128.100 20000 FWD Desg No Po1 Enabled 96.674 500 FWD Desg No Po3 Enabled 96.676 10000 FWD Desg No Po4 Enabled 96.677 5000 FWD Desg No Po5 Enabled 96.678 10000 FWD Desg No Po6 Enabled 96.679 10000 FWD Desg No Po7 Enabled 96.680 10000 FWD Desg Yes Po8 Enabled 96.681 10000 FWD Desg No --More-- or (q)uit Po20 Enabled 96.693 10000 FWD Desg No Po30 Enabled 96.703 6666 FWD Root No
###### MST 1 Vlan Mapped: 1, 80 ROOT ID Priority 16385 Address D067.E59E.D52E This Switch is the Root. Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec Interfaces
Name State Prio.Nbr Cost Sts Role RestrictedPort ------ -------- --------- --------- ---- ----- -------------- Gi1/0/3 Enabled 128.3 20000 FWD Desg No Gi1/0/6 Enabled 128.6 20000 FWD Desg No Gi1/0/21 Enabled 128.21 20000 FWD Desg No Gi1/0/22 Enabled 128.22 20000 FWD Desg No Gi1/0/23 Enabled 128.23 20000 FWD Desg No Gi1/0/39 Enabled 128.39 200000 FWD Desg No Gi1/0/40 Enabled 128.40 200000 FWD Desg No Gi1/0/41 Enabled 128.41 20000 FWD Desg No Gi1/0/42 Enabled 128.42 20000 FWD Desg No Gi1/0/45 Enabled 128.45 20000 FWD Desg No --More-- or (q)uit Gi1/0/48 Enabled 128.48 200000 FWD Desg No Gi2/0/5 Enabled 128.61 20000 FWD Desg No Gi2/0/21 Enabled 128.77 20000 FWD Desg No Gi2/0/22 Enabled 128.78 20000 FWD Desg No Gi2/0/23 Enabled 128.79 20000 FWD Desg No Gi2/0/39 Enabled 128.95 200000 FWD Desg No Gi2/0/41 Enabled 128.97 200000 FWD Desg No Gi2/0/44 Enabled 128.100 20000 FWD Desg No Po1 Enabled 96.674 500 FWD Desg No Po3 Enabled 96.676 10000 FWD Desg No Po4 Enabled 96.677 5000 FWD Desg No Po5 Enabled 96.678 10000 FWD Desg No Po6 Enabled 96.679 10000 FWD Desg No Po7 Enabled 96.680 10000 FWD Desg Yes Po8 Enabled 96.681 10000 FWD Desg No Po20 Enabled 96.693 10000 FWD Desg No Po30 Enabled 96.703 6666 FWD Mstr No
###### MST 2 Vlan Mapped: 6, 100, 105, 650 ROOT ID Priority 16386 Address D067.E59E.D52E This Switch is the Root. --More-- or (q)uit Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec Interfaces
Name State Prio.Nbr Cost Sts Role RestrictedPort ------ -------- --------- --------- ---- ----- -------------- Gi1/0/3 Enabled 128.3 20000 FWD Desg No Gi1/0/6 Enabled 128.6 20000 FWD Desg No Gi1/0/21 Enabled 128.21 20000 FWD Desg No Gi1/0/22 Enabled 128.22 20000 FWD Desg No Gi1/0/23 Enabled 128.23 20000 FWD Desg No Gi1/0/39 Enabled 128.39 200000 FWD Desg No Gi1/0/40 Enabled 128.40 200000 FWD Desg No Gi1/0/41 Enabled 128.41 20000 FWD Desg No Gi1/0/42 Enabled 128.42 20000 FWD Desg No Gi1/0/45 Enabled 128.45 20000 FWD Desg No Gi1/0/48 Enabled 128.48 200000 FWD Desg No Gi2/0/5 Enabled 128.61 20000 FWD Desg No Gi2/0/21 Enabled 128.77 20000 FWD Desg No Gi2/0/22 Enabled 128.78 20000 FWD Desg No Gi2/0/23 Enabled 128.79 20000 FWD Desg No Gi2/0/39 Enabled 128.95 200000 FWD Desg No Gi2/0/41 Enabled 128.97 200000 FWD Desg No Gi2/0/44 Enabled 128.100 20000 FWD Desg No --More-- or (q)uit Po1 Enabled 96.674 500 FWD Desg No Po3 Enabled 96.676 10000 FWD Desg No Po4 Enabled 96.677 5000 FWD Desg No Po5 Enabled 96.678 10000 FWD Desg No Po6 Enabled 96.679 10000 FWD Desg No Po7 Enabled 96.680 10000 FWD Desg Yes Po8 Enabled 96.681 10000 FWD Desg No Po20 Enabled 96.693 10000 FWD Desg No Po30 Enabled 96.703 6666 FWD Mstr No
Hello, looks like switches can't exchange special VLAN 1 information, on the Cisco side you shouldn't add vlan 1 into allowed vlan list, since this vlan default native and should be untagged.
Also I suggest you to add vlan 1 as native (untagged) on PowerConnect side as well.
Keep in mind Cisco can exchange stp service information between different vendor switches only over vlan 1 when it's configured as native.
Also your Cisco switch showing:
Po30 Desg FWD 6660 128.2056 P2p Bound(PVST)
so it didn't recognized MSTP running on the PowerConnect side, it thinks that he's region boundary switch
I tried many times with different methods but still having issue between Cisco 3850 and Dell7048P Powerconnect switch.
I changed both sides to run MSTP, but 3850 still think Dell7048 is a region boundary switch.
Port channel 105 (layer 2) is the layer 2 trunk between them and it is blocked on Dell side by MSTP. The only thing I can think of is that there may some mismatch on MST config between both, but I can't find out what mismatch is?
Is anyone here had any good suggestion? Many thanks
Charles
Cisco 3850:
sh spanning-tree mst configuration Name [SDCMST] Revision 1 Instances configured 2
Instance Vlans mapped -------- --------------------------------------------------------------------- 0 2-79,81-99,101-104,106-649,651-4094 1 1,80,100,105,650 ------------------------------------------------------------------------------- Suretek-Dist-SW01#sh sp Suretek-Dist-SW01#sh span Suretek-Dist-SW01#sh spanning-tree ac Suretek-Dist-SW01#sh spanning-tree active
MST0 Spanning tree enabled protocol mstp Root ID Priority 4096 Address a055.4f1c.0e00 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4096 (priority 4096 sys-id-ext 0) Address a055.4f1c.0e00 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
MST1 Spanning tree enabled protocol mstp Root ID Priority 4097 Address a055.4f1c.0e00 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4097 (priority 4096 sys-id-ext 1) Address a055.4f1c.0e00 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
But, there is no way to modify vlan list on instance 0. I was trying to create all unused vlan on Dell side in order to make vlan-list to be matched on Cisco, but Dell7048 does not support so many vlans.
Does this mean even MSTP is not possible to run in this scenario ?
Sorry it was my typo. it should be port channel 105.
In our environment, I have 2 stand-alone Cisco 3850 (SW01 & SW02) connecting to Dell7048P stack (SW03). There are 3 layer 2 port channels between each SW, and each portchannel is only allowed to passs one vlan traffic. In order to trouble shoot, I shutdown most of port channel between SW02 and SW03.
I was also having issue with PVST+ (SW1&2) and RSTP (SW3), and I finally decided to move to MSTP across all 3 SWs. After MSTP, I see port channel 105 and 107 are blocked (discarding) by MSTP, and both portchannel are used for same vlan traffic, 105 is on SW01and SW03 side, and 107 is on SW02 and SW03 side. For some reason, SW03(Dell7048) don't think itself is inside of the region where SW01 and SW02 are. I guess this is because the vlan and instance mapping of instance 0 on Cisco and Dell is slightly different.
I exhaused all my effort and don't know what to do. I will be be really appreciated if you can provide some assistance.
Hopefully we’re able to assist you on this one, usually there are some requirements that must match in terms of MST between switches: 1) MST name 2) MST configuration revision number 3) VLANs mapped to instances
In order to make both switches part of a common MST region, a group of switches must share the same configuration attributes. Have you tried configuring an MST test instance with a few VLANs shared in both Cisco and Dell?
I also had Webex with Murmanov twice, and we believed there are some non-standard thing in MSTP at Dell side, which caused 2 of 3 MST instances not to converge properly with Cisco.
MST config on both Cisco and Dell is definitely matched. I am thinking replace Dell switches we have in DC with Cisco ones....
charlesx
6 Posts
0
April 28th, 2017 05:00
Hi Daniel,
Thanks for your reply. To config trunk mode as "general" did not make difference. I configed both Cisco and Dell to run MSTP as suggested by Dell docu, and also upgraded Dell7048P to the latest code (5.1.10.1). The issue I am seeing is that both Cisco and Dell claim as root bridge on each instance of MST (except instance 0). Not sure why MST did not work between Cisco and Dell. I am scratching my head. Much appreciated if you can provide some idea.
Thanks
Charles
Cisco3850#
spanning-tree mst configuration
name SDCMST
revision 1
instance 1 vlan 1, 80
instance 2 vlan 6, 100, 105, 650
!
spanning-tree mst 0,2 priority 12288
spanning-tree mst 1 priority 8192
interface Port-channel30
switchport trunk allowed vlan 1,80,100,105,650
switchport mode trunk
Cisco3852# sh spanning-tree active
MST0
Spanning tree enabled protocol mstp
Root ID Priority 8192
Address a055.4f1c.0e00
Cost 0
Port 2027 (Port-channel1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 12288 (priority 12288 sys-id-ext 0)
Address f0b2.e580.2d00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/0/27 Desg FWD 20000 128.27 P2p
Gi1/0/28 Desg FWD 20000 128.28 P2p Edge
Gi1/0/29 Desg FWD 20000 128.29 P2p Edge
Gi1/0/43 Desg FWD 20000 128.43 P2p Edge
Gi1/0/44 Altn BLK 20000 128.44 P2p
Po1 Root FWD 5000 128.2027 P2p
Po10 Desg FWD 10000 128.2036 P2p Edge
Po15 Desg FWD 10000 128.2041 P2p Edge
Po30 Desg FWD 6660 128.2056 P2p Bound(PVST)
MST1
Spanning tree enabled protocol mstp
Root ID Priority 8193
Address f0b2.e580.2d00
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 8193 (priority 8192 sys-id-ext 1)
Address f0b2.e580.2d00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/0/27 Desg FWD 20000 128.27 P2p
Gi1/0/29 Desg FWD 20000 128.29 P2p Edge
Po1 Desg FWD 5000 128.2027 P2p
Po30 Desg FWD 6660 128.2056 P2p Bound(PVST)
MST2
Spanning tree enabled protocol mstp
Root ID Priority 8194
Address a055.4f1c.0e00
Cost 5000
Port 2027 (Port-channel1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 12290 (priority 12288 sys-id-ext 2)
Address f0b2.e580.2d00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/0/28 Desg FWD 20000 128.28 P2p Edge
Gi1/0/43 Desg FWD 20000 128.43 P2p Edge
Gi1/0/44 Altn BLK 20000 128.44 P2p
Po1 Root FWD 5000 128.2027 P2p
Po10 Desg FWD 10000 128.2036 P2p Edge
Po15 Desg FWD 10000 128.2041 P2p Edge
Po30 Desg FWD 6660 128.2056 P2p Bound(PVST)
Dell7048_SW01#show spanning-tree mst-configuration
Name: SDCMST
Revision: 1
Instance Vlan Mapped
---------- -----------------------------------------------
0 103, 4093
1 1, 80
2 6, 100, 105, 650
Dell7048_SW01#show running-config interface port-channel 30
switchport mode general
switchport general allowed vlan add 80,100,650 tagged
Dell7048_SW01#show spanning-tree active
Spanning tree Enabled (BPDU flooding : Disabled) Portfast BPDU filtering Disabled mode mst
CST Regional Root: 40:00:D0:67:E5:9E:D5:2E
Regional Root Path Cost: 0
###### MST 0 Vlan Mapped: 103, 4093
ROOT ID
Priority 8192
Address A055.4F1C.0E00
Path Cost 6666
Root Port Po30
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
Bridge ID
Priority 16384
Address D067.E59E.D52E
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
Interfaces
Name State Prio.Nbr Cost Sts Role RestrictedPort
------ -------- --------- --------- ---- ----- --------------
Gi1/0/3 Enabled 128.3 20000 FWD Desg No
Gi1/0/6 Enabled 128.6 20000 FWD Desg No
--More-- or (q)uit
Gi1/0/21 Enabled 128.21 20000 FWD Desg No
Gi1/0/22 Enabled 128.22 20000 FWD Desg No
Gi1/0/23 Enabled 128.23 20000 FWD Desg No
Gi1/0/39 Enabled 128.39 200000 FWD Desg No
Gi1/0/40 Enabled 128.40 200000 FWD Desg No
Gi1/0/41 Enabled 128.41 20000 FWD Desg No
Gi1/0/42 Enabled 128.42 20000 FWD Desg No
Gi1/0/45 Enabled 128.45 20000 FWD Desg No
Gi1/0/48 Enabled 128.48 200000 FWD Desg No
Gi2/0/5 Enabled 128.61 20000 FWD Desg No
Gi2/0/21 Enabled 128.77 20000 FWD Desg No
Gi2/0/22 Enabled 128.78 20000 FWD Desg No
Gi2/0/23 Enabled 128.79 20000 FWD Desg No
Gi2/0/39 Enabled 128.95 200000 FWD Desg No
Gi2/0/41 Enabled 128.97 200000 FWD Desg No
Gi2/0/44 Enabled 128.100 20000 FWD Desg No
Po1 Enabled 96.674 500 FWD Desg No
Po3 Enabled 96.676 10000 FWD Desg No
Po4 Enabled 96.677 5000 FWD Desg No
Po5 Enabled 96.678 10000 FWD Desg No
Po6 Enabled 96.679 10000 FWD Desg No
Po7 Enabled 96.680 10000 FWD Desg Yes
Po8 Enabled 96.681 10000 FWD Desg No
--More-- or (q)uit
Po20 Enabled 96.693 10000 FWD Desg No
Po30 Enabled 96.703 6666 FWD Root No
###### MST 1 Vlan Mapped: 1, 80
ROOT ID
Priority 16385
Address D067.E59E.D52E
This Switch is the Root.
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
Interfaces
Name State Prio.Nbr Cost Sts Role RestrictedPort
------ -------- --------- --------- ---- ----- --------------
Gi1/0/3 Enabled 128.3 20000 FWD Desg No
Gi1/0/6 Enabled 128.6 20000 FWD Desg No
Gi1/0/21 Enabled 128.21 20000 FWD Desg No
Gi1/0/22 Enabled 128.22 20000 FWD Desg No
Gi1/0/23 Enabled 128.23 20000 FWD Desg No
Gi1/0/39 Enabled 128.39 200000 FWD Desg No
Gi1/0/40 Enabled 128.40 200000 FWD Desg No
Gi1/0/41 Enabled 128.41 20000 FWD Desg No
Gi1/0/42 Enabled 128.42 20000 FWD Desg No
Gi1/0/45 Enabled 128.45 20000 FWD Desg No
--More-- or (q)uit
Gi1/0/48 Enabled 128.48 200000 FWD Desg No
Gi2/0/5 Enabled 128.61 20000 FWD Desg No
Gi2/0/21 Enabled 128.77 20000 FWD Desg No
Gi2/0/22 Enabled 128.78 20000 FWD Desg No
Gi2/0/23 Enabled 128.79 20000 FWD Desg No
Gi2/0/39 Enabled 128.95 200000 FWD Desg No
Gi2/0/41 Enabled 128.97 200000 FWD Desg No
Gi2/0/44 Enabled 128.100 20000 FWD Desg No
Po1 Enabled 96.674 500 FWD Desg No
Po3 Enabled 96.676 10000 FWD Desg No
Po4 Enabled 96.677 5000 FWD Desg No
Po5 Enabled 96.678 10000 FWD Desg No
Po6 Enabled 96.679 10000 FWD Desg No
Po7 Enabled 96.680 10000 FWD Desg Yes
Po8 Enabled 96.681 10000 FWD Desg No
Po20 Enabled 96.693 10000 FWD Desg No
Po30 Enabled 96.703 6666 FWD Mstr No
###### MST 2 Vlan Mapped: 6, 100, 105, 650
ROOT ID
Priority 16386
Address D067.E59E.D52E
This Switch is the Root.
--More-- or (q)uit
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
Interfaces
Name State Prio.Nbr Cost Sts Role RestrictedPort
------ -------- --------- --------- ---- ----- --------------
Gi1/0/3 Enabled 128.3 20000 FWD Desg No
Gi1/0/6 Enabled 128.6 20000 FWD Desg No
Gi1/0/21 Enabled 128.21 20000 FWD Desg No
Gi1/0/22 Enabled 128.22 20000 FWD Desg No
Gi1/0/23 Enabled 128.23 20000 FWD Desg No
Gi1/0/39 Enabled 128.39 200000 FWD Desg No
Gi1/0/40 Enabled 128.40 200000 FWD Desg No
Gi1/0/41 Enabled 128.41 20000 FWD Desg No
Gi1/0/42 Enabled 128.42 20000 FWD Desg No
Gi1/0/45 Enabled 128.45 20000 FWD Desg No
Gi1/0/48 Enabled 128.48 200000 FWD Desg No
Gi2/0/5 Enabled 128.61 20000 FWD Desg No
Gi2/0/21 Enabled 128.77 20000 FWD Desg No
Gi2/0/22 Enabled 128.78 20000 FWD Desg No
Gi2/0/23 Enabled 128.79 20000 FWD Desg No
Gi2/0/39 Enabled 128.95 200000 FWD Desg No
Gi2/0/41 Enabled 128.97 200000 FWD Desg No
Gi2/0/44 Enabled 128.100 20000 FWD Desg No
--More-- or (q)uit
Po1 Enabled 96.674 500 FWD Desg No
Po3 Enabled 96.676 10000 FWD Desg No
Po4 Enabled 96.677 5000 FWD Desg No
Po5 Enabled 96.678 10000 FWD Desg No
Po6 Enabled 96.679 10000 FWD Desg No
Po7 Enabled 96.680 10000 FWD Desg Yes
Po8 Enabled 96.681 10000 FWD Desg No
Po20 Enabled 96.693 10000 FWD Desg No
Po30 Enabled 96.703 6666 FWD Mstr No
murmanov
1 Rookie
•
62 Posts
1
April 28th, 2017 06:00
Hello, looks like switches can't exchange special VLAN 1 information, on the Cisco side you shouldn't add vlan 1 into allowed vlan list, since this vlan default native and should be untagged.
Also I suggest you to add vlan 1 as native (untagged) on PowerConnect side as well.
Keep in mind Cisco can exchange stp service information between different vendor switches only over vlan 1 when it's configured as native.
Also your Cisco switch showing:
Po30 Desg FWD 6660 128.2056 P2p Bound(PVST)
so it didn't recognized MSTP running on the PowerConnect side, it thinks that he's region boundary switch
charlesx
6 Posts
0
May 23rd, 2017 23:00
HI all,
I tried many times with different methods but still having issue between Cisco 3850 and Dell7048P Powerconnect switch.
I changed both sides to run MSTP, but 3850 still think Dell7048 is a region boundary switch.
Port channel 105 (layer 2) is the layer 2 trunk between them and it is blocked on Dell side by MSTP. The only thing I can think of is that there may some mismatch on MST config between both, but I can't find out what mismatch is?
Is anyone here had any good suggestion? Many thanks
Charles
Cisco 3850:
sh spanning-tree mst configuration
Name [SDCMST]
Revision 1 Instances configured 2
Instance Vlans mapped
-------- ---------------------------------------------------------------------
0 2-79,81-99,101-104,106-649,651-4094
1 1,80,100,105,650
-------------------------------------------------------------------------------
Suretek-Dist-SW01#sh sp
Suretek-Dist-SW01#sh span
Suretek-Dist-SW01#sh spanning-tree ac
Suretek-Dist-SW01#sh spanning-tree active
MST0
Spanning tree enabled protocol mstp
Root ID Priority 4096
Address a055.4f1c.0e00
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4096 (priority 4096 sys-id-ext 0)
Address a055.4f1c.0e00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/0/5 Desg FWD 2000000 128.5 P2p
Gi1/0/27 Desg FWD 20000 128.27 P2p
Gi1/0/28 Desg FWD 20000 128.28 P2p Edge
Po5 Desg FWD 10000 128.2031 P2p Edge
Po10 Desg FWD 10000 128.2036 P2p Edge
Po15 Desg FWD 10000 128.2041 P2p Edge
Po21 Desg FWD 10000 128.2047 P2p
Po22 Desg FWD 10000 128.2048 P2p
Po23 Desg FWD 10000 128.2049 P2p
Po105 Desg FWD 10000 128.2131 P2p Bound(PVST)
Po115 Desg FWD 20000 128.2141 P2p
MST1
Spanning tree enabled protocol mstp
Root ID Priority 4097
Address a055.4f1c.0e00
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4097 (priority 4096 sys-id-ext 1)
Address a055.4f1c.0e00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/0/5 Desg FWD 2000000 128.5 P2p
Gi1/0/27 Desg FWD 20000 128.27 P2p
Gi1/0/28 Desg FWD 20000 128.28 P2p Edge
Po5 Desg FWD 10000 128.2031 P2p Edge
Po10 Desg FWD 10000 128.2036 P2p Edge
Po15 Desg FWD 10000 128.2041 P2p Edge
Po21 Desg FWD 10000 128.2047 P2p
Po22 Desg FWD 10000 128.2048 P2p
Po23 Desg FWD 10000 128.2049 P2p
Po105 Desg FWD 10000 128.2131 P2p Bound(PVST)
Po115 Desg FWD 20000 128.2141 P2p
****************************************************
Dell7048:
show spanning-tree mst-configuration
Name: SDCMST
Revision: 1
Instance Vlan Mapped
---------- -----------------------------------------------
0 4093
1 1, 80, 100, 105, 650
show spanning-tree active
Spanning tree Enabled (BPDU flooding : Disabled) Portfast BPDU filtering Disabled mode mst
CST Regional Root: 10:00:A0:55:4F:1C:0E:00
Regional Root Path Cost: 20000
###### MST 0 Vlan Mapped: 4093
ROOT ID
Priority 4096
Address A055.4F1C.0E00
Path Cost 0
Root Port Po115
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
Bridge ID
Priority 16384
Address D067.E59E.D52E
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
Interfaces
Name State Prio.Nbr Cost Sts Role RestrictedPort
------ -------- --------- --------- ---- ----- --------------
Gi1/0/3 Enabled 128.3 20000 FWD Desg No
Gi1/0/6 Enabled 128.6 20000 FWD Desg No
Gi1/0/21 Enabled 128.21 20000 FWD Desg No
Gi1/0/22 Enabled 128.22 20000 FWD Desg No
Gi1/0/23 Enabled 128.23 20000 FWD Desg No
Gi1/0/39 Enabled 128.39 200000 FWD Desg No
Gi1/0/40 Enabled 128.40 200000 FWD Desg No
Gi1/0/41 Enabled 128.41 20000 FWD Desg No
Gi1/0/42 Enabled 128.42 20000 FWD Desg No
Gi1/0/45 Enabled 128.45 20000 FWD Desg No
Gi1/0/48 Enabled 128.48 200000 FWD Desg No
Gi2/0/5 Enabled 128.61 20000 FWD Desg No
Gi2/0/21 Enabled 128.77 20000 FWD Desg No
Gi2/0/22 Enabled 128.78 20000 FWD Desg No
Gi2/0/23 Enabled 128.79 20000 FWD Desg No
Gi2/0/39 Enabled 128.95 200000 FWD Desg No
Gi2/0/41 Enabled 128.97 200000 FWD Desg No
Gi2/0/44 Enabled 128.100 20000 FWD Desg No
Po1 Enabled 96.674 500 FWD Desg No
Po3 Enabled 96.676 10000 FWD Desg No
Po4 Enabled 96.677 5000 FWD Desg No
Po5 Enabled 96.678 10000 FWD Desg No
Po6 Enabled 96.679 10000 FWD Desg No
Po7 Enabled 96.680 10000 FWD Desg Yes
Po8 Enabled 96.681 10000 FWD Desg No
Po20 Enabled 96.693 10000 FWD Desg No
Po105 Enabled 96.778 10000 DSC Altn No
Po107 Enabled 96.780 10000 DSC Altn No
Po115 Enabled 96.788 20000 FWD Root No
###### MST 1 Vlan Mapped: 1, 80, 100, 105, 650
ROOT ID
Priority 4097
Address A055.4F1C.0E00
Path Cost 20000
Root Port Po115
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
Bridge ID
Priority 16384
Address D067.E59E.D52E
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
Interfaces
Name State Prio.Nbr Cost Sts Role RestrictedPort
------ -------- --------- --------- ---- ----- --------------
Gi1/0/3 Enabled 128.3 20000 FWD Desg No
Gi1/0/6 Enabled 128.6 20000 FWD Desg No
Gi1/0/21 Enabled 128.21 20000 FWD Desg No
Gi1/0/22 Enabled 128.22 20000 FWD Desg No
Gi1/0/23 Enabled 128.23 20000 FWD Desg No
Gi1/0/39 Enabled 128.39 200000 FWD Desg No
Gi1/0/40 Enabled 128.40 200000 FWD Desg No
Gi1/0/41 Enabled 128.41 20000 FWD Desg No
Gi1/0/42 Enabled 128.42 20000 FWD Desg No
Gi1/0/45 Enabled 128.45 20000 FWD Desg No
Gi1/0/48 Enabled 128.48 200000 FWD Desg No
Gi2/0/5 Enabled 128.61 20000 FWD Desg No
Gi2/0/21 Enabled 128.77 20000 FWD Desg No
Gi2/0/22 Enabled 128.78 20000 FWD Desg No
Gi2/0/23 Enabled 128.79 20000 FWD Desg No
Gi2/0/39 Enabled 128.95 200000 FWD Desg No
Gi2/0/41 Enabled 128.97 200000 FWD Desg No
Gi2/0/44 Enabled 128.100 20000 FWD Desg No
Po1 Enabled 96.674 500 FWD Desg No
Po3 Enabled 96.676 10000 FWD Desg No
Po4 Enabled 96.677 5000 FWD Desg No
Po5 Enabled 96.678 10000 FWD Desg No
Po6 Enabled 96.679 10000 FWD Desg No
Po7 Enabled 96.680 10000 FWD Desg Yes
Po8 Enabled 96.681 10000 FWD Desg No
Po20 Enabled 96.693 10000 FWD Desg No
Po105 Enabled 96.778 10000 DSC Altn No
Po107 Enabled 96.780 10000 DSC Altn No
Po115 Enabled 96.788 20000 FWD Root No
charlesx
6 Posts
0
May 24th, 2017 00:00
The only thing I can see is that vlan to instance 0 mapping on both is a bit different.
Cisco 3850:
Instance Vlans mapped
-------- ---------------------------------------------------------------------
0 2-79,81-99,101-104,106-649,651-4094
Dell:
Instance Vlan Mapped
---------- -----------------------------------------------
0 4093
But, there is no way to modify vlan list on instance 0. I was trying to create all unused vlan on Dell side in order to make vlan-list to be matched on Cisco, but Dell7048 does not support so many vlans.
Does this mean even MSTP is not possible to run in this scenario ?
Cheers
Charles
charlesx
6 Posts
0
May 24th, 2017 01:00
Hi Murmanov,
Sorry it was my typo. it should be port channel 105.
In our environment, I have 2 stand-alone Cisco 3850 (SW01 & SW02) connecting to Dell7048P stack (SW03). There are 3 layer 2 port channels between each SW, and each portchannel is only allowed to passs one vlan traffic. In order to trouble shoot, I shutdown most of port channel between SW02 and SW03.
I was also having issue with PVST+ (SW1&2) and RSTP (SW3), and I finally decided to move to MSTP across all 3 SWs. After MSTP, I see port channel 105 and 107 are blocked (discarding) by MSTP, and both portchannel are used for same vlan traffic, 105 is on SW01and SW03 side, and 107 is on SW02 and SW03 side. For some reason, SW03(Dell7048) don't think itself is inside of the region where SW01 and SW02 are. I guess this is because the vlan and instance mapping of instance 0 on Cisco and Dell is slightly different.
I exhaused all my effort and don't know what to do. I will be be really appreciated if you can provide some assistance.
Thanks
Charles
murmanov
1 Rookie
•
62 Posts
0
May 24th, 2017 01:00
Hello, Charles, I don't see any problems in your output at this moment.
On Dell switch 7048 I see that Po115 showing as Root port in your stp output.
Also root bridge id for both instances showing that Cisco 3850 is root.
Can you please confirm, do you have 2 port-channel connected from Cisco 3850 to Dell 7048 ?
HildaCSC
1 Message
0
May 24th, 2017 16:00
Hi Charles
Issues like this can be tricky and indeed tiring.
Hopefully we’re able to assist you on this one, usually there are some requirements that must match in terms of MST between switches:
1) MST name
2) MST configuration revision number
3) VLANs mapped to instances
In order to make both switches part of a common MST region, a group of switches must share the same configuration attributes.
Have you tried configuring an MST test instance with a few VLANs shared in both Cisco and Dell?
If that still does not work, we suggest you to open a discussion at the Cisco community so an expert on this matter can help solve this issue: https://supportforums.cisco.com/community/6016/lan-switching-and-routing
Also, perhaps this “MST Configuration and MST Region” information may be useful:
www.cisco.com/.../24248-147.html
charlesx
6 Posts
0
May 25th, 2017 05:00
Hi Hldacss,
I also had Webex with Murmanov twice, and we believed there are some non-standard thing in MSTP at Dell side, which caused 2 of 3 MST instances not to converge properly with Cisco.
MST config on both Cisco and Dell is definitely matched. I am thinking replace Dell switches we have in DC with Cisco ones....
Cheers
Charles