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1
Helpful
10
Replies

Keep having root-inconsistent on secondary priority

brick2
Level 1
Level 1

I've been trying to work create a network with multilayer 3650, that has STP and DHCP, and got stuck on the STP part.

here are the commands I put in my topology, in the order I put them -
MU -
int ra g1/0/3-5
switchport mode trunk
switchport trunk allowed vlan all

A0
vlan 77
name MNG
ex
vlan 37
name FIN
ex

A1

vlan 64
name HR
ex
vlan 55
name SL
ex

A2

vlan 114
name MKT
ex
vlan 154
name TSP
ex

MU
vlan 77
name MNG
ex
vlan 37
name FIN
ex
vlan 64
name HR
ex
vlan 55
name SL
ex
vlan 114
name MKT
ex
vlan 154
name TSP
ex

A0
int ra fa0/1-6
switchport mode access
switchport access vlan 37
ex
int ra fa0/7-12
switchport mode access
switchport access vlan 77
ex

A1
int ra fa0/1-6
switchport mode access
switchport access vlan 55
ex
int ra fa0/7-12
switchport mode access
switchport access vlan 64
ex

A2
int ra fa0/1-6
switchport mode access
switchport access vlan 114
ex
int ra fa0/7-12
switchport mode access
switchport access vlan 154
ex

All SWs
spanning-tree mode rapid-pvst

A0
spanning-tree vlan 37,77

A1
spanning-tree vlan 55,64
A2
spanning-tree vlan 154,114

MU0 -
spanning-tree vlan 1,77,37,64 root primary
spanning-tree vlan 55,114,154 root secondary

MU1 -
spanning-tree vlan 55,114,154 root primary
spanning-tree vlan 1,77,37,64 root secondary

All of the access sws
interface range fastethernet0/1-12
spanning-tree bpduguard enable
spanning-tree portfast
exit

MU
interface range g1/0/3,g1/0/4,g1/0/5
spanning-tree guard root

After a few minutes, I got this in MU0 -
%LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/6, changed state to up
%SPANTREE-2-ROOTGUARDBLOCK: Port 1/0/5 tried to become non-designated in VLAN 154.

Moved to root-inconsistent state
%SPANTREE-2-ROOTGUARDBLOCK: Port 1/0/5 tried to become non-designated in VLAN 114.

Moved to root-inconsistent state
%SPANTREE-2-ROOTGUARDBLOCK: Port 1/0/4 tried to become non-designated in VLAN 55.

Moved to root-inconsistent state

And this in MU1 -
SPANTREE-2-ROOTGUARDBLOCK: Port 1/0/3 tried to become non-designated in VLAN 37.

Moved to root-inconsistent state
%SPANTREE-2-ROOTGUARDBLOCK: Port 1/0/3 tried to become non-designated in VLAN 77.

Moved to root-inconsistent state
%SPANTREE-2-ROOTGUARDBLOCK: Port 1/0/4 tried to become non-designated in VLAN 64.

Moved to root-inconsistent state

I dont understand why this keep happening

Screenshot 2024-09-25 102124.png

1 Accepted Solution

Accepted Solutions

One more point  add same vlan in all SW 

I see you add only two vlan in two SW add all VLAN

MHM

View solution in original post

10 Replies 10

Vlan allow in trunk must match in SW

brick2
Level 1
Level 1

I've redid it with
interface g1/0/3
switchport mode trunk
switchport trunk allowed vlan 37,77
ex
int g1/0/4
switchport mode trunk
switchport trunk allowed vlan 55,64
ex
int g1/0/5
switchport mode trunk
switchport trunk allowed vlan 114,154
ex

and still get the same problem

This needed 


interface g1/0/3
switchport mode trunk
switchport trunk allowed vlan 37,77, 55,64,114,154
ex
int g1/0/4
switchport mode trunk
switchport trunk allowed vlan 
37,77, 55,64,114,154
int g1/0/5
switchport mode trunk
switchport trunk allowed vlan 37,77, 55,64,114,154
ex

Tried that and got the same result 

Friend allow same vlan in all trunk in your network' that what you need 

MHM

One more point  add same vlan in all SW 

I see you add only two vlan in two SW add all VLAN

MHM

that seems to work, thank you so much!!

You are welcome 

MHM

brick2
Level 1
Level 1

@brick2 

Easier to help if you attach the PacketTracer file here. Just zip it first.