I have a 3550 (c3550-ipservicesk9-mz.122-35.SE5.bin), an ME3400 (me340x-metroaccess-mz.122-40.SE.bin) and two MRV 912 switches. All three support MST, which (by all indications) I think I have setup correctly.
- 3550 F0/1 connects to 3400 F0/1
- 3550 F0/2 connects to MRV1 Port 2
- 3400 F0/2 connects to MRV2 Port 2
- MRV1 Port 1 connects to MRV2 Port 1.
On both the 3550 and the 3400, it shows F0/2 for all MST instances as "P2p Bound(PVST)". What does that mean? Does it mean that it thinks the MRVs are talking PVST to it? The MRVs don't even speak PVST.
Is that "P2p Bound(PVST)" a misnomer, and does it actually mean something else?
3550>show spanning-tree
MST0
Spanning tree enabled protocol mstp
Root ID Priority 24576
Address 0011.bbfb.4180
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 24576 (priority 24576 sys-id-ext 0)
Address 0011.bbfb.4180
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/1 Desg FWD 200000 128.1 P2p
Fa0/2 Desg FWD 200000 128.2 P2p Bound(PVST)
Fa0/23 Desg FWD 2000000 128.23 Shr
Fa0/24 Desg FWD 200000 128.24 P2p Bound(STP)
MST1
Spanning tree enabled protocol mstp
Root ID Priority 24577
Address 0011.bbfb.4180
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 24577 (priority 24576 sys-id-ext 1)
Address 0011.bbfb.4180
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/1 Desg FWD 200000 128.1 P2p
Fa0/2 Desg FWD 200000 128.2 P2p Bound(PVST)
Fa0/23 Desg FWD 2000000 128.23 Shr
Fa0/24 Desg FWD 200000 128.24 P2p Bound(STP)
3400>show span
MST0
Spanning tree enabled protocol mstp
Root ID Priority 24576
Address 0011.bbfb.4180
Cost 0
Port 3 (FastEthernet0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 28672 (priority 28672 sys-id-ext 0)
Address 001d.e53b.4280
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1 Root FWD 200000 128.3 P2p
Fa0/2 Desg FWD 200000 128.4 P2p Bound(PVST)
MST1
Spanning tree enabled protocol mstp
Root ID Priority 24577
Address 0011.bbfb.4180
Cost 200000
Port 3 (FastEthernet0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 28673 (priority 28672 sys-id-ext 1)
Address 001d.e53b.4280
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/1 Root FWD 200000 128.3 P2p
Fa0/2 Desg FWD 200000 128.4 P2p Bound(PVST)
On the MRV side, it thinks the Droot is via port 2, which is correct so it's certainly speaking MST.
# show spanning-tree instance 0
...
BridgeId: 8000-000fbd0170cf Bridge Priority: 32768 (0x8000)
Designated Root: 6000-0011bbfb4180 Root Port: 8002 (2 )
...
Any thoughts?
