Hi,
I've been going through the first set of Nexus workbooks on the DC track, and have been testing BA with MST, and I don't seem to be able to get it to work - or am I missing something? My N7k is connected to my N5k via a standard port channel (port channel 2).
Below are the relevant parts of the configs:
N7K1:
vlan 1,10,20,30,40,50,60,100
spanning-tree mode mst
spanning-tree pathcost method long
spanning-tree mst 0-2 priority 4096
spanning-tree mst configuration
name MST100
revision 100
instance 1 vlan 10,20,30,40,50,60
instance 2 vlan 100
N5K1:
vlan 1,10,20,30
spanning-tree mode mst
spanning-tree pathcost method long
spanning-tree mst configuration
name MST100
revision 100
instance 1 vlan 10,20,30
As you can see, on N5k1, vlan 40,50,60 and 100 do not exist. Also instance 2 does not exist on N5k2
However, when I do the output of 'sh vlan x' (where x is either 40,50,60 or 100) on N7k1, I would expect to see Bridge Assurance showing me inconsistencies for those vlans which do not exist on N5k1, but what I see is the following:
N7K1# sh spanning-tree vlan 40
MST0001
Spanning tree enabled protocol mstp
Root ID Priority 4097
Address 0024.98e8.01c4
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 0024.98e8.01c4
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po2 Desg FWD 500 128.4097 Network P2p
N7K1# sh spanning-tree vlan 50
MST0001
Spanning tree enabled protocol mstp
Root ID Priority 4097
Address 0024.98e8.01c4
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 0024.98e8.01c4
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po2 Desg FWD 500 128.4097 Network P2p
N7K1# sh spanning-tree vlan 60
MST0001
Spanning tree enabled protocol mstp
Root ID Priority 4097
Address 0024.98e8.01c4
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 0024.98e8.01c4
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po2 Desg FWD 500 128.4097 Network P2p
N7K1# sh spanning-tree vlan 100
MST0002
Spanning tree enabled protocol mstp
Root ID Priority 4098
Address 0024.98e8.01c4
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4098 (priority 4096 sys-id-ext 2)
Address 0024.98e8.01c4
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po2 Desg FWD 500 128.4097 Network P2p
However, if I change everything back to RPVST+, I get the following:
N7K1(config)# sh spanning-tree vlan 40
VLAN0040
Spanning tree enabled protocol rstp
Root ID Priority 4136
Address 0024.98e8.01c4
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4136 (priority 4096 sys-id-ext 40)
Address 0024.98e8.01c4
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po2 Desg BKN*500 128.4097 Network P2p *BA_Inc
N7K1(config)# sh spanning-tree vlan 50
VLAN0050
Spanning tree enabled protocol rstp
Root ID Priority 4146
Address 0024.98e8.01c4
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4146 (priority 4096 sys-id-ext 50)
Address 0024.98e8.01c4
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po2 Desg BKN*500 128.4097 Network P2p *BA_Inc
N7K1(config)# sh spanning-tree vlan 60
VLAN0060
Spanning tree enabled protocol rstp
Root ID Priority 4156
Address 0024.98e8.01c4
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4156 (priority 4096 sys-id-ext 60)
Address 0024.98e8.01c4
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po2 Desg BKN*500 128.4097 Network P2p *BA_Inc
N7K1(config)# sh spanning-tree vlan 100
VLAN0100
Spanning tree enabled protocol rstp
Root ID Priority 4196
Address 0024.98e8.01c4
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4196 (priority 4096 sys-id-ext 100)
Address 0024.98e8.01c4
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Po2 Desg BKN*500 128.4097 Network P2p *BA_Inc
N7K1(config)#
I'm sure I'm missing something fairly straight forward!!