Mst

EdTheLad

I'm having some issues with MST, can anyone shed some light on the output below.
If this is the root bridge why is the port role Backup and the state Blocking?


CWYT-S-002#sh spanning-tree vlan 100

VLAN0100
Spanning tree enabled protocol rstp
Root ID Priority 32868
Address 0013.5f21.0f80
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32868 (priority 32768 sys-id-ext 100)
Address 0013.5f21.0f80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300

Interface Role Sts Cost Prio.Nbr Type

---

---- ---

---

---

---

Gi3/8 Back BLK 4 128.264 P2p

EdTheLad

I found my problem, the port is connected to an ASR9000, i had a bridge-domain setup with multiple vlans, i didn't realise this wasn't allowed and i can only have 1 vlan per bridge-domain otherwise the bpdus get re-circulated.