Yes, the 6513 is the root bridge for all VLANs. And yes, the top g0/2 is connected to the middle g0/1, the middle g0/2 is connected to the bottom g0/1. Uplinkfast is not enabled. All 3550s are configured identically (less hostname, IP, etc.) as follows:
!
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname xxxxxxxxxxxxx
!
aaa new-model
aaa authentication login default group tacacs+ line
aaa authentication login console line
aaa authorization exec default group tacacs+ if-authenticated
aaa authorization network default group tacacs+
enable secret xxxxxxxxxxxxx
!
clock timezone CST -6
clock summer-time CST recurring
ip subnet-zero
no ip domain-lookup
!
mls qos map cos-dscp 0 8 16 26 32 46 48 56
mls qos min-reserve 5 170
mls qos min-reserve 6 10
mls qos min-reserve 7 65
mls qos min-reserve 8 26
mls qos
udld aggressive
!
!
spanning-tree mode mst
spanning-tree extend system-id
spanning-tree backbonefast
!
spanning-tree mst configuration
name xxxxxx
revision 2
instance 1 vlan 1-4094
!
!
!
interface FastEthernet0/1
switchport access vlan 124
switchport mode dynamic desirable
switchport trunk encapsulation dot1q
switchport trunk native vlan 124
switchport voice vlan 201
no ip address
mls qos trust device cisco-phone
mls qos trust cos
storm-control broadcast level 75.00
auto qos voip cisco-phone
wrr-queue bandwidth 20 1 80 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
!
!All FastEthernet interfaces configured the same
!
!
interface FastEthernet0/24
switchport access vlan 124
switchport mode dynamic desirable
switchport trunk encapsulation dot1q
switchport trunk native vlan 124
switchport voice vlan 201
no ip address
mls qos trust device cisco-phone
mls qos trust cos
storm-control broadcast level 75.00
auto qos voip cisco-phone
wrr-queue bandwidth 20 1 80 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
interface GigabitEthernet0/1
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
mls qos trust cos
udld port aggressive
storm-control broadcast level 75.00
auto qos voip trust
wrr-queue bandwidth 20 1 80 1
wrr-queue queue-limit 80 1 20 1
wrr-queue cos-map 1 0 1 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
!
interface GigabitEthernet0/2
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
mls qos trust cos
udld port aggressive
storm-control broadcast level 75.00
auto qos voip trust
wrr-queue bandwidth 20 1 80 1
wrr-queue queue-limit 80 1 20 1
wrr-queue cos-map 1 0 1 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
!
interface Vlan1
no ip address
shutdown
!
interface Vlan124
ip address 10.xxx.xxx.x 255.255.254.0
!
ip default-gateway 10.xxx.xxx.1
ip classless
no ip http server
!
!
logging 10.xxx.xxx.xxx
access-list 10 permit 10.xxx.xxx.0 0.0.15.255
snmp-server community xxxxxxxxx RW
snmp-server chassis-id xxxxxxxxxx
snmp-server host 10.xxx.xxx.xxx xxxxxxx envmon syslog snmp
tacacs-server host 10.xxx.xxx.xxx key xxxxxxxxx
!
line con 0
password xxxxxxxxx
logging synchronous
login authentication console
line vty 0 4
access-class 10 in
password xxxxxxxxx
logging synchronous
login authentication default
line vty 5 15
access-class 10 in
password xxxxxxxxx
logging synchronous
login authentication default
!
ntp server 10.xxx.xxx.xxx
!
end
Here is the output from a show spantree detail:
MST00 is executing the mstp compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 0, address 000b.be3d.7a80
Configured hello time 2, max age 20, forward delay 15
Current root has priority 24576, address 000b.4522.45c0
Root port is 26 (GigabitEthernet0/2), cost of root path is 0
Topology change flag not set, detected flag not set
Number of topology changes 2 last change occurred 00:01:13 ago
from GigabitEthernet0/2
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0
Port 25 (GigabitEthernet0/1) of MST00 is alternate blocking
Port path cost 20000, Port priority 128, Port Identifier 128.25.
Designated root has priority 24576, address 000b.4522.45c0
Designated bridge has priority 32768, address 000b.bea4.9f00
Designated port id is 128.26, designated path cost 0
Timers: message age 4, forward delay 0, hold 0
Number of transitions to forwarding state: 0
Link type is point-to-point by default, Internal
BPDU: sent 13, received 45
Port 26 (GigabitEthernet0/2) of MST00 is root forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.26.
Designated root has priority 24576, address 000b.4522.45c0
Designated bridge has priority 32768, address 000b.bea3.b280
Designated port id is 128.25, designated path cost 0
Timers: message age 4, forward delay 0, hold 0
Number of transitions to forwarding state: 0
Link type is point-to-point by default, Internal
BPDU: sent 13, received 43
MST01 is executing the mstp compatible Spanning Tree protocol
Bridge Identifier has priority 32768, sysid 1, address 000b.be3d.7a80
Configured hello time 2, max age 20, forward delay 15
Current root has priority 24577, address 000b.4522.45c0
Root port is 26 (GigabitEthernet0/2), cost of root path is 40000
Topology change flag not set, detected flag not set
Number of topology changes 5 last change occurred 00:01:17 ago
from GigabitEthernet0/2
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0
Port 25 (GigabitEthernet0/1) of MST01 is alternate blocking
Port path cost 20000, Port priority 128, Port Identifier 128.25.
Designated root has priority 24577, address 000b.4522.45c0
Designated bridge has priority 32769, address 000b.bea4.9f00
Designated port id is 128.26, designated path cost 20000
Timers: message age 4, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default, Internal
BPDU: sent 13, received 47
Port 26 (GigabitEthernet0/2) of MST01 is root forwarding
Port path cost 20000, Port priority 128, Port Identifier 128.26.
Designated root has priority 24577, address 000b.4522.45c0
Designated bridge has priority 32769, address 000b.bea3.b280
Designated port id is 128.25, designated path cost 20000
Timers: message age 4, forward delay 0, hold 0
Number of transitions to forwarding state: 2
Link type is point-to-point by default, Internal
BPDU: sent 13, received 45
Thanks for any help or suggestions.
