Hello!
I am experiencing slow RSTP convergence times between 27-30 seconds, instead of the 2-3 seconds.
I have a 4 node setup which can be seen in the attached picture. 2* Cisco 9500 joined over a 20GB Stackwise Virtual Link with 2* Catalyst 9000 coming off each of them.
My problem begins with when I switch off the te1/1/1 which connected directly to the 9500, it then takes around 30 seconds to converge through te1/1/4 to establish a link.
AVO-48PORT-4-10GB#show span sum
Switch is in rapid-pvst mode
Root bridge for: none
EtherChannel misconfig guard is enabled
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001 1 0 0 2 3
VLAN0030 1 0 0 2 3
VLAN0040 1 0 0 2 3
VLAN0050 1 0 0 2 3
VLAN0060 1 0 0 2 3
VLAN0070 1 0 0 2 3
VLAN0080 1 0 0 2 3
VLAN0097 1 0 0 2 3
VLAN0098 1 0 0 2 3
VLAN0099 1 0 0 2 3
VLAN0100 1 0 0 2 3
---------------------- -------- --------- -------- ---------- ----------
11 vlans 11 0 0 22 33
RPD-48PORT-4-10GB#sho span sum
Switch is in rapid-pvst mode
Root bridge for: none
EtherChannel misconfig guard is enabled
Extended system ID is enabled
Portfast Default is disabled
PortFast BPDU Guard Default is disabled
Portfast BPDU Filter Default is disabled
Loopguard Default is disabled
UplinkFast is disabled
BackboneFast is disabled
Configured Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001 0 0 0 2 2
VLAN0005 0 0 0 2 2
VLAN0030 0 0 0 2 2
VLAN0040 0 0 0 2 2
VLAN0050 0 0 0 2 2
VLAN0060 0 0 0 2 2
VLAN0070 0 0 0 2 2
VLAN0080 0 0 0 2 2
VLAN0097 0 0 0 2 2
VLAN0098 0 0 0 2 2
VLAN0099 0 0 0 2 2
VLAN0100 0 0 0 2 2
---------------------- -------- --------- -------- ---------- ----------
12 vlans
AVO-48PORT-4-10GB#show span
VLAN0001
Spanning tree enabled protocol rstp
Root ID Priority 32769
Address 4cbc.480e.9580
Cost 2
Port 49 (TenGigabitEthernet1/1/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 78bc.1abc.ad80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/0/41 Desg FWD 4 128.41 P2p (THIS IS MY LAPTOP CONNECTED FOR TESTNG)
Te1/1/1 Root FWD 2 128.49 P2p
Te1/1/4 Altn BLK 2 128.52 P2p
RPD-48PORT-4-10GB#show spanning-tree
VLAN0001
Spanning tree enabled protocol rstp
Root ID Priority 32769
Address 4cbc.480e.9580
Cost 2
Port 49 (TenGigabitEthernet1/1/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 6c8b.d357.3180
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/1/1 Root FWD 2 128.49 P2p
Te1/1/4 Desg FWD 2 128.52 P2p
I would appreciate your expertise and feedback.
Many thanks
