What are some of the issues that can cause an RSTP root port to permanently remain in a blocking state? Unfortunately I can't post much output due to confidentiality.
router#sh spann vlan 7
VLAN0007
Spanning tree enabled protocol rstp
Root ID Priority 24583
Address 0022.5516.1234
Cost 7
Port 13 (GigabitEthernet1/1/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32775 (priority 32768 sys-id-ext 7)
Address a493.4c09.1458
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/1/1 Root BLK 4 128.13 P2p
Po11 Desg FWD 3 128.592 P2p
Po12 Desg FWD 3 128.600 P2p
Po13 Desg FWD 3 128.608 P2p
St1 Desg FWD 4 128.896 P2p Peer(STP)
