RSTP troubleshooting

Alexandre.Pieroux · ‎04-22-2013

Hi,

I've got some problems with a complex network using rstp.

As a student I've got to find a solution to make a fully redudant topology:

CoreSwitch1 :------------------------------:CoreSwitch2

So the 2 core, as it can be seen above, are connecte together and the core "switch1" is the vtp root in the topology.

And it's critical for the network that an "old" catalyst 6513 is the bridge of the entire network, so we have decided to put a stack of 2 catalyst 3750 above the 2 core to ensure redudancy and security.

Here is the new topology:

SwitchStack3750

/ \

CoreSwitch1 :----------------------x:CoreSwitch2

To provide a backup link we still have the 2 core connected, the stack is the vtp root.

At this point every things is alright ^^

But I've worked on a RSTP solution to avoid any problem of connection if something fail.

So If a one of the 2 "root links" fail it switch on the backup link between the 2 cores.

I've also set the stack as the root primary for all the vlans.

So I've configured RSTP on each switch ( the 2 core and the stack) and every things seems okay but, this morning the network was in trouble.

The connection was going down every 30 sec and we were unable to connect more than a minutes.

I've deactivated RSTP and the network recovery and every things was working proprerly.

I don't know what's the problem with RSTP and how to see what's going on. I can see that the stack receiv "VLAN*** Tpology change rcvd on G1/0/*" every 20 - 30 seconds for each VLAN.

I'm very confused, how can I see where is the problem with RSTP ? Why STP doesn't make this problem ?

Does every other switches in the network have to be in rstp mode ?

Is it the convergence time that flood the network ?

Is there an other solution to do the same without STP ?

Help me, please !

Best regard.

Alexandre.Pieroux · ‎04-24-2013

Does the topology changes propagation can cause this trouble ? Just the 3 switches are un rstp pvst+ and the rest of the network is in default spanning-tree mode.

Any help is welcom

Maximilian88 · ‎04-24-2013

Which switch is your root bridge?

Could you please show us the output from the following commands for each switch.

That makes it easier to troubleshoot your issue.

show spanning-tree

show cdp neighbours (if activated)

Alexandre.Pieroux · ‎04-24-2013

The root bridge is the SwitchStack 3750.

Her is the output for 3750 (pvst mode these switch are critical so if I turn pvst mode the network flap):

SwitchStack3750#sh span

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 4097

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 4097 (priority 4096 sys-id-ext 1)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

Po3 Desg FWD 4 128.504 P2p Edge

Po4 Desg FWD 4 128.512 P2p Edge

Po5 Desg FWD 4 128.520 P2p Edge

Po6 Desg FWD 4 128.528 P2p Edge

Po7 Desg FWD 3 128.536 P2p Edge

Po8 Desg FWD 4 128.544 P2p Edge

St1 Desg FWD 4 128.872 P2p

VLAN0002

Spanning tree enabled protocol ieee

Root ID Priority 24578

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24578 (priority 24576 sys-id-ext 2)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0010

Spanning tree enabled protocol ieee

Root ID Priority 24586

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24586 (priority 24576 sys-id-ext 10)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0011

Spanning tree enabled protocol ieee

Root ID Priority 24587

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24587 (priority 24576 sys-id-ext 11)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0012

Spanning tree enabled protocol ieee

Root ID Priority 24588

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24588 (priority 24576 sys-id-ext 12)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0013

Spanning tree enabled protocol ieee

Root ID Priority 24589

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24589 (priority 24576 sys-id-ext 13)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0014

Spanning tree enabled protocol ieee

Root ID Priority 24590

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24590 (priority 24576 sys-id-ext 14)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0015

Spanning tree enabled protocol ieee

Root ID Priority 24591

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24591 (priority 24576 sys-id-ext 15)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0016

Spanning tree enabled protocol ieee

Root ID Priority 24592

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24592 (priority 24576 sys-id-ext 16)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0017

Spanning tree enabled protocol ieee

Root ID Priority 24593

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24593 (priority 24576 sys-id-ext 17)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0018

Spanning tree enabled protocol ieee

Root ID Priority 24594

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24594 (priority 24576 sys-id-ext 18)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0020

Spanning tree enabled protocol ieee

Root ID Priority 24596

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24596 (priority 24576 sys-id-ext 20)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0023

Spanning tree enabled protocol ieee

Root ID Priority 4119

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 4119 (priority 4096 sys-id-ext 23)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0025

Spanning tree enabled protocol ieee

Root ID Priority 24601

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24601 (priority 24576 sys-id-ext 25)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0100

Spanning tree enabled protocol ieee

Root ID Priority 24676

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24676 (priority 24576 sys-id-ext 100)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0150

Spanning tree enabled protocol ieee

Root ID Priority 150

Address acf2.c52b.9c80

Cost 23

Port 1 (GigabitEthernet1/0/1)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24726 (priority 24576 sys-id-ext 150)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Root FWD 4 128.1 P2p

Gi1/0/13 Desg FWD 19 128.13 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

Gi2/0/13 Desg FWD 19 128.67 P2p

VLAN0200

Spanning tree enabled protocol ieee

Root ID Priority 24776

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24776 (priority 24576 sys-id-ext 200)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0207

Spanning tree enabled protocol ieee

Root ID Priority 24783

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 24783 (priority 24576 sys-id-ext 207)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

VLAN0248

Spanning tree enabled protocol ieee

Root ID Priority 4344

Address 5057.a84a.b180

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 4344 (priority 4096 sys-id-ext 248)

Address 5057.a84a.b180

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15 sec

Interface Role Sts Cost Prio.Nbr Type

------------------- ---- --- --------- -------- --------------------------------

Gi1/0/1 Desg FWD 4 128.1 P2p

Po2 Desg FWD 4 128.496 P2p

St1 Desg FWD 4 128.872 P2p

SwitchStack3750#sh cdp nei

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,

D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID Local Intrfce Holdtme Capability Platform Port ID

SwitchCore2

Gig 2/0/1 133 R S I WS-C6509 Gig 4/45

SwitchCore1

Gig 1/0/1 177 R S I WS-C6513 Gig 10/10

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------

For SwitchCore1:

SwitchCore1#sh span

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 4097

Address 5057.a84a.b180

Cost 4

Port 1162 (GigabitEthernet10/10)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 8193 (priority 8192 sys-id-ext 1)

Address 0005.74e3.2a80

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi3/1 Desg FWD 4 128.257 P2p

Gi3/2 Desg FWD 4 128.258 P2p

Gi3/3 Desg FWD 4 128.259 P2p

Gi3/7 Desg FWD 4 128.263 P2p

Gi3/8 Desg FWD 4 128.264 P2p

Fa6/1 Desg FWD 19 128.641 P2p

Fa6/3 Desg FWD 19 128.643 P2p

Fa6/6 Desg FWD 19 128.646 P2p

Fa6/7 Desg FWD 19 128.647 P2p

Fa6/8 Desg FWD 19 128.648 P2p

Fa6/9 Desg FWD 19 128.649 P2p

Fa6/10 Desg FWD 19 128.650 P2p

Fa6/11 Desg FWD 19 128.651 P2p

Fa6/12 Desg FWD 19 128.652 P2p

Fa6/13 Desg FWD 19 128.653 P2p

Fa6/14 Desg FWD 19 128.654 P2p

Fa6/15 Desg FWD 19 128.655 P2p

Fa6/16 Desg FWD 19 128.656 P2p

Fa6/17 Desg FWD 19 128.657 P2p

Fa6/18 Desg FWD 19 128.658 P2p

Fa6/20 Desg FWD 19 128.660 P2p

Fa6/21 Desg FWD 19 128.661 P2p

Fa6/22 Desg FWD 19 128.662 P2p

Fa6/23 Desg FWD 19 128.663 P2p

Fa6/24 Desg FWD 19 128.664 P2p

Fa6/25 Desg FWD 19 128.665 P2p

Fa6/26 Desg FWD 19 128.666 P2p

Fa6/27 Desg FWD 19 128.667 P2p

Fa6/30 Desg FWD 19 128.670 P2p

Fa6/32 Desg FWD 19 128.672 P2p

Fa6/34 Desg FWD 19 128.674 P2p

Fa6/36 Desg FWD 19 128.676 P2p

Fa6/37 Desg FWD 19 128.677 P2p

Fa6/38 Desg FWD 19 128.678 P2p

Fa6/39 Desg FWD 19 128.679 P2p

Fa6/40 Desg FWD 19 128.680 P2p

Fa6/41 Desg FWD 19 128.681 P2p

Fa6/43 Desg FWD 19 128.683 P2p

Fa6/44 Desg FWD 19 128.684 P2p

Fa6/45 Desg FWD 19 128.685 P2p

Fa6/46 Desg FWD 19 128.686 P2p

Fa6/48 Desg FWD 100 128.688 Shr

Fa7/1 Desg FWD 19 128.769 P2p

Fa7/2 Desg FWD 19 128.770 P2p

Fa7/3 Desg FWD 19 128.771 P2p

Fa7/4 Desg FWD 19 128.772 P2p

Fa7/5 Desg FWD 19 128.773 P2p

Fa7/6 Desg FWD 19 128.774 P2p

Fa7/8 Desg FWD 19 128.776 P2p

Fa7/9 Desg FWD 19 128.777 P2p

Fa7/10 Desg FWD 19 128.778 P2p

Fa7/12 Desg FWD 19 128.780 P2p

Fa7/14 Desg FWD 19 128.782 P2p

Fa7/15 Desg FWD 19 128.783 P2p

Fa7/17 Desg FWD 19 128.785 P2p

Fa7/18 Desg FWD 19 128.786 P2p

Fa7/19 Desg FWD 19 128.787 P2p

Fa7/20 Desg FWD 19 128.788 P2p

Fa7/21 Desg FWD 19 128.789 P2p

Fa7/22 Desg FWD 19 128.790 P2p

Fa7/23 Desg FWD 19 128.791 P2p

Fa7/25 Desg FWD 19 128.793 P2p

Fa7/26 Desg FWD 19 128.794 P2p

Fa7/27 Desg FWD 19 128.795 P2p

Fa7/28 Desg FWD 19 128.796 P2p

Fa7/29 Desg FWD 19 128.797 P2p

Fa7/30 Desg FWD 19 128.798 P2p

Fa7/32 Desg FWD 19 128.800 P2p

Fa7/33 Desg FWD 19 128.801 P2p

Fa7/35 Desg FWD 19 128.803 P2p

Fa7/36 Desg FWD 19 128.804 P2p

Fa7/37 Desg FWD 19 128.805 P2p

Fa7/38 Desg FWD 19 128.806 P2p

Fa7/39 Desg FWD 19 128.807 P2p

Fa7/40 Desg FWD 19 128.808 P2p

Fa7/41 Desg FWD 19 128.809 P2p

Fa7/45 Desg FWD 19 128.813 P2p

Fa7/47 Desg FWD 19 128.815 P2p

Fa7/48 Desg FWD 19 128.816 P2p

Fa8/1 Desg FWD 19 128.897 P2p

Fa8/2 Desg FWD 19 128.898 P2p

Fa8/3 Desg FWD 19 128.899 P2p

Fa8/4 Desg FWD 19 128.900 P2p

Fa8/5 Desg FWD 19 128.901 P2p

Fa8/8 Desg FWD 19 128.904 P2p

Fa8/10 Desg FWD 19 128.906 P2p

Fa8/11 Desg FWD 19 128.907 P2p

Fa8/12 Desg FWD 19 128.908 P2p

Fa8/13 Desg FWD 19 128.909 P2p

Fa8/14 Desg FWD 19 128.910 P2p

Fa8/15 Desg FWD 19 128.911 P2p

Fa8/16 Desg FWD 19 128.912 P2p

Fa8/18 Desg FWD 19 128.914 P2p

Fa8/21 Desg FWD 19 128.917 P2p

Fa8/22 Desg FWD 19 128.918 P2p

Fa8/23 Desg FWD 19 128.919 P2p

Fa8/24 Desg FWD 19 128.920 P2p

Fa8/25 Desg FWD 19 128.921 P2p

Fa8/29 Desg FWD 19 128.925 P2p

Fa8/30 Desg FWD 19 128.926 P2p

Fa8/32 Desg FWD 19 128.928 P2p

Fa8/34 Desg FWD 19 128.930 P2p

Fa8/35 Desg FWD 19 128.931 P2p

Fa8/37 Desg FWD 19 128.933 P2p

Fa8/41 Desg FWD 19 128.937 P2p

Fa8/42 Desg FWD 19 128.938 P2p

Fa8/45 Desg FWD 19 128.941 P2p

Fa8/47 Desg FWD 19 128.943 P2p

Fa9/2 Desg FWD 19 128.1026 P2p

Fa9/4 Desg FWD 19 128.1028 P2p

Fa9/7 Desg FWD 19 128.1031 P2p

Fa9/8 Desg FWD 19 128.1032 P2p

Fa9/9 Desg FWD 19 128.1033 P2p

Fa9/13 Desg FWD 19 128.1037 P2p

Fa9/14 Desg FWD 19 128.1038 P2p

Fa9/16 Desg FWD 19 128.1040 P2p

Fa9/17 Desg FWD 19 128.1041 P2p

Fa9/18 Desg FWD 19 128.1042 P2p

Fa9/19 Desg FWD 19 128.1043 P2p

Fa9/20 Desg FWD 19 128.1044 P2p

Fa9/23 Desg FWD 19 128.1047 P2p

Fa9/28 Desg FWD 19 128.1052 Edge P2p

Fa9/30 Desg FWD 19 128.1054 P2p

Fa9/36 Desg FWD 100 128.1060 Shr

Fa9/37 Desg FWD 19 128.1061 P2p

Fa9/39 Desg FWD 19 128.1063 P2p

Fa9/41 Desg FWD 19 128.1065 P2p

Fa9/42 Desg FWD 19 128.1066 P2p

Fa9/44 Desg FWD 19 128.1068 P2p

Fa9/46 Desg FWD 19 128.1070 P2p

Fa9/47 Desg FWD 19 128.1071 P2p

Gi10/1 Desg FWD 4 128.1153 P2p

Gi10/2 Desg FWD 4 128.1154 P2p

Gi10/3 Desg FWD 4 128.1155 P2p

Gi10/4 Desg FWD 4 128.1156 P2p

Gi10/10 Root FWD 4 128.1162 P2p

Gi10/11 Desg FWD 4 128.1163 P2p

Gi10/12 Desg FWD 19 128.1164 P2p

Gi10/15 Desg FWD 100 128.1167 Shr

Gi10/16 Desg FWD 4 128.1168 P2p

Gi10/17 Desg FWD 100 128.1169 Shr

Gi10/18 Desg FWD 4 128.1170 P2p

Gi10/19 Desg FWD 4 128.1171 Edge P2p

Gi10/20 Desg FWD 100 128.1172 Shr

Gi10/21 Desg FWD 4 128.1173 P2p

Gi10/22 Desg FWD 100 128.1174 Shr

Gi10/23 Desg FWD 4 128.1175 P2p

Gi10/24 Desg FWD 100 128.1176 Shr

Gi10/26 Desg FWD 19 128.1178 P2p

Gi10/27 Desg FWD 19 128.1179 P2p

Gi10/28 Desg FWD 4 128.1180 P2p

Gi10/29 Desg FWD 19 128.1181 P2p

Gi10/30 Desg FWD 19 128.1182 P2p

Gi10/31 Desg FWD 19 128.1183 P2p

Gi10/32 Desg FWD 4 128.1184 P2p

Gi10/33 Desg FWD 19 128.1185 P2p

Gi10/34 Desg FWD 100 128.1186 Shr

Gi10/39 Desg FWD 4 128.1191 P2p

Gi10/40 Desg FWD 4 128.1192 P2p

Gi10/41 Desg FWD 4 128.1193 P2p

Gi10/42 Desg FWD 4 128.1194 P2p

Gi10/44 Desg FWD 4 128.1196 P2p

Gi10/45 Desg FWD 4 128.1197 P2p

Gi10/46 Desg FWD 4 128.1198 P2p

Gi10/47 Desg FWD 4 128.1199 P2p

Gi10/48 Desg FWD 4 128.1200 P2p

Fa12/3 Desg FWD 19 128.1411 P2p

Fa12/5 Desg FWD 19 128.1413 P2p

Fa12/7 Desg FWD 19 128.1415 P2p

Fa12/8 Desg FWD 19 128.1416 P2p

Fa12/9 Desg FWD 19 128.1417 P2p

Fa12/10 Desg FWD 19 128.1418 P2p

Fa12/11 Desg FWD 100 128.1419 Shr

Fa12/14 Desg FWD 19 128.1422 P2p

Fa12/16 Desg FWD 19 128.1424 P2p

Fa12/19 Desg FWD 19 128.1427 P2p

Fa12/21 Desg FWD 19 128.1429 P2p

Fa12/22 Desg FWD 100 128.1430 Shr

Fa12/24 Desg FWD 19 128.1432 P2p

Fa12/25 Desg FWD 19 128.1433 P2p

Fa12/26 Desg FWD 19 128.1434 P2p

Fa12/27 Desg FWD 19 128.1435 P2p

Fa12/28 Desg FWD 19 128.1436 P2p

Fa12/29 Desg FWD 19 128.1437 Shr

Fa12/30 Desg FWD 19 128.1438 P2p

Fa12/31 Desg FWD 19 128.1439 P2p

Fa12/32 Desg FWD 19 128.1440 P2p

Fa12/35 Desg FWD 19 128.1443 P2p

Fa12/37 Desg FWD 19 128.1445 P2p

Fa12/38 Desg FWD 19 128.1446 P2p

Fa12/40 Desg FWD 19 128.1448 P2p

Fa12/41 Desg FWD 19 128.1449 P2p

Fa12/42 Desg FWD 19 128.1450 P2p

Fa12/43 Desg FWD 19 128.1451 P2p

Fa12/44 Desg FWD 19 128.1452 P2p

Fa12/48 Desg FWD 19 128.1456 P2p

Fa13/1 Desg FWD 19 128.1537 P2p

Fa13/2 Desg FWD 19 128.1538 P2p

Fa13/5 Desg FWD 19 128.1541 P2p

Fa13/6 Desg FWD 19 128.1542 P2p

Fa13/7 Desg FWD 19 128.1543 P2p

Fa13/9 Desg FWD 19 128.1545 P2p

Fa13/11 Desg FWD 19 128.1547 P2p

Fa13/13 Desg FWD 19 128.1549 P2p

Fa13/16 Desg FWD 19 128.1552 P2p

Fa13/17 Desg FWD 19 128.1553 P2p

Fa13/19 Desg FWD 19 128.1555 P2p

Fa13/24 Desg FWD 19 128.1560 P2p

Fa13/25 Desg FWD 19 128.1561 P2p

Fa13/26 Desg FWD 19 128.1562 P2p

Fa13/27 Desg FWD 19 128.1563 P2p

Fa13/28 Desg FWD 19 128.1564 P2p

Fa13/29 Desg FWD 19 128.1565 P2p

Fa13/30 Desg FWD 19 128.1566 P2p

Fa13/32 Desg FWD 19 128.1568 P2p

Fa13/33 Desg FWD 19 128.1569 P2p

Fa13/34 Desg FWD 19 128.1570 P2p

Fa13/35 Desg FWD 100 128.1571 Shr

Fa13/37 Desg FWD 19 128.1573 P2p

Fa13/38 Desg FWD 19 128.1574 P2p

Fa13/39 Desg FWD 19 128.1575 P2p

Fa13/40 Desg FWD 19 128.1576 P2p

Fa13/43 Desg FWD 19 128.1579 P2p

Fa13/44 Desg FWD 19 128.1580 P2p

Fa13/47 Desg FWD 19 128.1583 P2p

Po5 Desg FWD 3 128.1667 P2p

Po6 Desg FWD 3 128.1668 P2p

Po2 Desg FWD 12 128.1676 Edge P2p

VLAN0002

Spanning tree enabled protocol ieee

Root ID Priority 24578

Address 5057.a84a.b180

Cost 4

Port 1162 (GigabitEthernet10/10)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32770 (priority 32768 sys-id-ext 2)

Address 0005.74e3.2a80

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi3/1 Desg FWD 4 128.257 P2p

Gi3/2 Desg FWD 4 128.258 P2p

Gi3/3 Desg FWD 4 128.259 P2p

Gi3/7 Desg FWD 4 128.263 P2p

Gi3/8 Desg FWD 4 128.264 P2p

Fa6/1 Desg FWD 19 128.641 P2p

Fa6/3 Desg FWD 19 128.643 P2p

Fa6/6 Desg FWD 19 128.646 P2p

Fa6/7 Desg FWD 19 128.647 P2p

Fa6/8 Desg FWD 19 128.648 P2p

Fa6/9 Desg FWD 19 128.649 P2p

Fa6/10 Desg FWD 19 128.650 P2p

Fa6/11 Desg FWD 19 128.651 P2p

Fa6/12 Desg FWD 19 128.652 P2p

Fa6/13 Desg FWD 19 128.653 P2p

Fa6/14 Desg FWD 19 128.654 P2p

Fa6/15 Desg FWD 19 128.655 P2p

Fa6/16 Desg FWD 19 128.656 P2p

Fa6/17 Desg FWD 19 128.657 P2p

Fa6/18 Desg FWD 19 128.658 P2p

Fa6/20 Desg FWD 19 128.660 P2p

Fa6/21 Desg FWD 19 128.661 P2p

Fa6/22 Desg FWD 19 128.662 P2p

Fa6/23 Desg FWD 19 128.663 P2p

Fa6/24 Desg FWD 19 128.664 P2p

Fa6/25 Desg FWD 19 128.665 P2p

Fa6/26 Desg FWD 19 128.666 P2p

Fa6/27 Desg FWD 19 128.667 P2p

Fa6/30 Desg FWD 19 128.670 P2p

Fa6/32 Desg FWD 19 128.672 P2p

Fa6/34 Desg FWD 19 128.674 P2p

Fa6/36 Desg FWD 19 128.676 P2p

Fa6/37 Desg FWD 19 128.677 P2p

Fa6/38 Desg FWD 19 128.678 P2p

Fa6/39 Desg FWD 19 128.679 P2p

Fa6/40 Desg FWD 19 128.680 P2p

Fa6/41 Desg FWD 19 128.681 P2p

Fa6/43 Desg FWD 19 128.683 P2p

Fa6/44 Desg FWD 19 128.684 P2p

Fa6/45 Desg FWD 19 128.685 P2p

Fa6/46 Desg FWD 19 128.686 P2p

Fa6/48 Desg FWD 100 128.688 Shr

Fa7/1 Desg FWD 19 128.769 P2p

Fa7/2 Desg FWD 19 128.770 P2p

Fa7/3 Desg FWD 19 128.771 P2p

Fa7/4 Desg FWD 19 128.772 P2p

Fa7/5 Desg FWD 19 128.773 P2p

Fa7/6 Desg FWD 19 128.774 P2p

Fa7/8 Desg FWD 19 128.776 P2p

Fa7/9 Desg FWD 19 128.777 P2p

Fa7/10 Desg FWD 19 128.778 P2p

Fa7/12 Desg FWD 19 128.780 P2p

Fa7/14 Desg FWD 19 128.782 P2p

Fa7/15 Desg FWD 19 128.783 P2p

Fa7/17 Desg FWD 19 128.785 P2p

Fa7/18 Desg FWD 19 128.786 P2p

Fa7/19 Desg FWD 19 128.787 P2p

Fa7/20 Desg FWD 19 128.788 P2p

Fa7/21 Desg FWD 19 128.789 P2p

Fa7/22 Desg FWD 19 128.790 P2p

Fa7/23 Desg FWD 19 128.791 P2p

Fa7/25 Desg FWD 19 128.793 P2p

Fa7/26 Desg FWD 19 128.794 P2p

Fa7/27 Desg FWD 19 128.795 P2p

Fa7/28 Desg FWD 19 128.796 P2p

Fa7/29 Desg FWD 19 128.797 P2p

Fa7/30 Desg FWD 19 128.798 P2p

Fa7/32 Desg FWD 19 128.800 P2p

Fa7/33 Desg FWD 19 128.801 P2p

Fa7/35 Desg FWD 19 128.803 P2p

Fa7/36 Desg FWD 19 128.804 P2p

Fa7/37 Desg FWD 19 128.805 P2p

Fa7/38 Desg FWD 19 128.806 P2p

Fa7/39 Desg FWD 19 128.807 P2p

Fa7/40 Desg FWD 19 128.808 P2p

Fa7/41 Desg FWD 19 128.809 P2p

Fa7/45 Desg FWD 19 128.813 P2p

Fa7/47 Desg FWD 19 128.815 P2p

Fa7/48 Desg FWD 19 128.816 P2p

Fa8/1 Desg FWD 19 128.897 P2p

Fa8/2 Desg FWD 19 128.898 P2p

Fa8/3 Desg FWD 19 128.899 P2p

Fa8/4 Desg FWD 19 128.900 P2p

Fa8/5 Desg FWD 19 128.901 P2p

Fa8/8 Desg FWD 19 128.904 P2p

Fa8/10 Desg FWD 19 128.906 P2p

Fa8/11 Desg FWD 19 128.907 P2p

Fa8/12 Desg FWD 19 128.908 P2p

Fa8/13 Desg FWD 19 128.909 P2p

Fa8/14 Desg FWD 19 128.910 P2p

Fa8/15 Desg FWD 19 128.911 P2p

Fa8/16 Desg FWD 19 128.912 P2p

Fa8/18 Desg FWD 19 128.914 P2p

Fa8/21 Desg FWD 19 128.917 P2p

Fa8/22 Desg FWD 19 128.918 P2p

Fa8/23 Desg FWD 19 128.919 P2p

Fa8/24 Desg FWD 19 128.920 P2p

Fa8/25 Desg FWD 19 128.921 P2p

Fa8/29 Desg FWD 19 128.925 P2p

Fa8/30 Desg FWD 19 128.926 P2p

Fa8/32 Desg FWD 19 128.928 P2p

Fa8/34 Desg FWD 19 128.930 P2p

Fa8/35 Desg FWD 19 128.931 P2p

Fa8/37 Desg FWD 19 128.933 P2p

Fa8/41 Desg FWD 19 128.937 P2p

Fa8/42 Desg FWD 19 128.938 P2p

Fa8/45 Desg FWD 19 128.941 P2p

Fa8/47 Desg FWD 19 128.943 P2p

Fa9/2 Desg FWD 19 128.1026 P2p

Fa9/4 Desg FWD 19 128.1028 P2p

Fa9/7 Desg FWD 19 128.1031 P2p

Fa9/8 Desg FWD 19 128.1032 P2p

Fa9/9 Desg FWD 19 128.1033 P2p

Fa9/13 Desg FWD 19 128.1037 P2p

Fa9/14 Desg FWD 19 128.1038 P2p

Fa9/16 Desg FWD 19 128.1040 P2p

Fa9/17 Desg FWD 19 128.1041 P2p

Fa9/18 Desg FWD 19 128.1042 P2p

Fa9/19 Desg FWD 19 128.1043 P2p

Fa9/20 Desg FWD 19 128.1044 P2p

Fa9/23 Desg FWD 19 128.1047 P2p

Fa9/36 Desg FWD 100 128.1060 Shr

Fa9/37 Desg FWD 19 128.1061 P2p

Fa9/39 Desg FWD 19 128.1063 P2p

Fa9/41 Desg FWD 19 128.1065 P2p

Fa9/42 Desg FWD 19 128.1066 P2p

Fa9/44 Desg FWD 19 128.1068 P2p

Fa9/46 Desg FWD 19 128.1070 P2p

Fa9/47 Desg FWD 19 128.1071 P2p

Gi10/10 Root FWD 4 128.1162 P2p

Gi10/11 Desg FWD 4 128.1163 P2p

Gi10/12 Desg FWD 19 128.1164 P2p

Gi10/15 Desg FWD 100 128.1167 Shr

Gi10/16 Desg FWD 4 128.1168 P2p

Gi10/17 Desg FWD 100 128.1169 Shr

Gi10/18 Desg FWD 4 128.1170 P2p

Gi10/20 Desg FWD 100 128.1172 Shr

Gi10/21 Desg FWD 4 128.1173 P2p

Gi10/22 Desg FWD 100 128.1174 Shr

Gi10/23 Desg FWD 4 128.1175 P2p

Gi10/24 Desg FWD 100 128.1176 Shr

Gi10/26 Desg FWD 19 128.1178 P2p

Gi10/27 Desg FWD 19 128.1179 P2p

Gi10/28 Desg FWD 4 128.1180 P2p

Gi10/29 Desg FWD 19 128.1181 P2p

Gi10/30 Desg FWD 19 128.1182 P2p

Gi10/31 Desg FWD 19 128.1183 P2p

Gi10/32 Desg FWD 4 128.1184 P2p

Gi10/33 Desg FWD 19 128.1185 P2p

Gi10/34 Desg FWD 100 128.1186 Shr

Gi10/39 Desg FWD 4 128.1191 P2p

Gi10/40 Desg FWD 4 128.1192 P2p

Gi10/41 Desg FWD 4 128.1193 P2p

Gi10/42 Desg FWD 4 128.1194 P2p

Gi10/44 Desg FWD 4 128.1196 P2p

Gi10/45 Desg FWD 4 128.1197 P2p

Gi10/46 Desg FWD 4 128.1198 P2p

Gi10/47 Desg FWD 4 128.1199 P2p

Gi10/48 Desg FWD 4 128.1200 P2p

Fa12/3 Desg FWD 19 128.1411 P2p

Fa12/5 Desg FWD 19 128.1413 P2p

Fa12/7 Desg FWD 19 128.1415 P2p

Fa12/8 Desg FWD 19 128.1416 P2p

Fa12/9 Desg FWD 19 128.1417 P2p

Fa12/10 Desg FWD 19 128.1418 P2p

Fa12/11 Desg FWD 100 128.1419 Shr

Fa12/14 Desg FWD 19 128.1422 P2p

Fa12/16 Desg FWD 19 128.1424 P2p

Fa12/19 Desg FWD 19 128.1427 P2p

Fa12/21 Desg FWD 19 128.1429 P2p

Fa12/22 Desg FWD 100 128.1430 Shr

Fa12/24 Desg FWD 19 128.1432 P2p

Fa12/25 Desg FWD 19 128.1433 P2p

Fa12/26 Desg FWD 19 128.1434 P2p

Fa12/27 Desg FWD 19 128.1435 P2p

Fa12/28 Desg FWD 19 128.1436 P2p

Fa12/29 Desg FWD 19 128.1437 Shr

Fa12/30 Desg FWD 19 128.1438 P2p

Fa12/31 Desg FWD 19 128.1439 P2p

Fa12/32 Desg FWD 19 128.1440 P2p

Fa12/35 Desg FWD 19 128.1443 P2p

Fa12/37 Desg FWD 19 128.1445 P2p

Fa12/38 Desg FWD 19 128.1446 P2p

Fa12/40 Desg FWD 19 128.1448 P2p

Fa12/41 Desg FWD 19 128.1449 P2p

Fa12/42 Desg FWD 19 128.1450 P2p

Fa12/43 Desg FWD 19 128.1451 P2p

Fa12/44 Desg FWD 19 128.1452 P2p

Fa12/48 Desg FWD 19 128.1456 P2p

Fa13/1 Desg FWD 19 128.1537 P2p

Fa13/2 Desg FWD 19 128.1538 P2p

Fa13/5 Desg FWD 19 128.1541 P2p

Fa13/6 Desg FWD 19 128.1542 P2p

Fa13/7 Desg FWD 19 128.1543 P2p

Fa13/9 Desg FWD 19 128.1545 P2p

Fa13/11 Desg FWD 19 128.1547 P2p

Fa13/13 Desg FWD 19 128.1549 P2p

Fa13/16 Desg FWD 19 128.1552 P2p

Fa13/17 Desg FWD 19 128.1553 P2p

Fa13/19 Desg FWD 19 128.1555 P2p

Fa13/24 Desg FWD 19 128.1560 P2p

Fa13/25 Desg FWD 19 128.1561 P2p

Fa13/26 Desg FWD 19 128.1562 P2p

Fa13/27 Desg FWD 19 128.1563 P2p

Fa13/28 Desg FWD 19 128.1564 P2p

Fa13/29 Desg FWD 19 128.1565 P2p

Fa13/30 Desg FWD 19 128.1566 P2p

Fa13/32 Desg FWD 19 128.1568 P2p

Fa13/33 Desg FWD 19 128.1569 P2p

Fa13/34 Desg FWD 19 128.1570 P2p

Fa13/35 Desg FWD 100 128.1571 Shr

Fa13/37 Desg FWD 19 128.1573 P2p

Fa13/38 Desg FWD 19 128.1574 P2p

Fa13/39 Desg FWD 19 128.1575 P2p

Fa13/40 Desg FWD 19 128.1576 P2p

Fa13/43 Desg FWD 19 128.1579 P2p

Fa13/44 Desg FWD 19 128.1580 P2p

Fa13/47 Desg FWD 19 128.1583 P2p

It's a huge output so I've juste past for vlan1 and vlan2, the others seems similar :-)

SwitchCore1#sh cdp nei

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID Local Intrfce Holdtme Capability Platform Port ID

SwitchStack3750

Gi 4/45 147 R S I WS-C3750X-Gig 1/0/1

SwitchCore2

Gi 1/1 160 R S I WS-C6509-Gig1/1

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------

For SwitchCore2:

SwitchCore2#sh span

(Just vlan1 , a lot of port in trunk mode...)

VLAN0001

Spanning tree enabled protocol ieee

Root ID Priority 4097

Address 5057.a84a.b180

Cost 4

Port 1665 (Port-channel2)

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 16385 (priority 16384 sys-id-ext 1)

Address 000e.d69f.4e40

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 15

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi4/3 Desg FWD 4 128.387 P2p

Gi4/4 Desg FWD 19 128.388 P2p

Gi4/5 Desg FWD 19 128.389 P2p

Gi4/6 Desg FWD 4 128.390 P2p

Gi4/12 Desg FWD 19 128.396 P2p

Gi4/15 Desg FWD 4 128.399 P2p

Gi4/17 Desg FWD 19 128.401 P2p

Gi4/18 Desg FWD 4 128.402 P2p

Gi4/19 Desg FWD 4 128.403 P2p

Gi4/21 Desg FWD 19 128.405 P2p

Gi4/22 Desg FWD 4 128.406 P2p

Gi4/23 Desg FWD 4 128.407 P2p

Gi4/24 Desg FWD 19 128.408 P2p

Gi4/25 Desg FWD 4 128.409 P2p

Gi4/26 Desg FWD 19 128.410 P2p

Gi4/27 Desg FWD 19 128.411 P2p

Gi4/28 Desg FWD 4 128.412 P2p

Gi4/29 Desg FWD 19 128.413 P2p

Gi4/30 Desg FWD 4 128.414 P2p

Gi4/31 Desg FWD 19 128.415 P2p

Gi4/32 Desg FWD 4 128.416 P2p

Gi4/34 Desg FWD 4 128.418 P2p

Gi4/35 Desg FWD 4 128.419 P2p

Gi4/36 Desg FWD 4 128.420 P2p

Gi4/38 Desg FWD 4 128.422 P2p

Gi4/40 Desg FWD 4 128.424 P2p

Fa5/2 Desg FWD 19 128.514 P2p

Fa5/3 Desg FWD 19 128.515 P2p

Fa5/5 Desg FWD 19 128.517 P2p

Fa5/6 Desg FWD 19 128.518 P2p

Fa5/7 Desg FWD 19 128.519 P2p

Fa5/8 Desg FWD 19 128.520 P2p

Fa5/9 Desg FWD 19 128.521 P2p

Fa5/10 Desg FWD 19 128.522 P2p

Fa5/12 Desg FWD 19 128.524 P2p

Fa5/13 Desg FWD 19 128.525 P2p

Fa5/14 Desg FWD 19 128.526 P2p

Fa5/16 Desg FWD 19 128.528 P2p

Fa5/19 Desg FWD 19 128.531 P2p

Fa5/22 Desg FWD 19 128.534 P2p

Fa5/24 Desg FWD 19 128.536 P2p

Fa5/25 Desg FWD 19 128.537 P2p

Fa5/26 Desg FWD 19 128.538 P2p

Fa5/27 Desg FWD 19 128.539 P2p

Fa5/28 Desg FWD 19 128.540 P2p

Fa5/29 Desg FWD 19 128.541 P2p

Fa5/30 Desg FWD 19 128.542 P2p

Fa5/31 Desg FWD 19 128.543 P2p

Fa5/33 Desg FWD 19 128.545 P2p

Fa5/41 Desg FWD 19 128.553 P2p

Fa5/42 Desg FWD 19 128.554 P2p

Fa5/43 Desg FWD 19 128.555 P2p

Fa5/45 Desg FWD 19 128.557 P2p

Fa5/46 Desg FWD 19 128.558 P2p

Fa5/48 Desg FWD 19 128.560 P2p

Fa6/1 Desg FWD 100 128.641 Shr

Fa6/2 Desg FWD 19 128.642 P2p

Fa6/3 Desg FWD 19 128.643 P2p

Fa6/4 Desg FWD 19 128.644 P2p

Fa6/10 Desg FWD 19 128.650 P2p

Fa6/12 Desg FWD 19 128.652 P2p

Fa6/14 Desg FWD 19 128.654 P2p

Fa6/15 Desg FWD 19 128.655 P2p

Fa6/16 Desg FWD 19 128.656 P2p

Fa6/17 Desg FWD 19 128.657 P2p

Fa6/18 Desg FWD 19 128.658 P2p

Fa6/21 Desg FWD 19 128.661 P2p

Fa6/22 Desg FWD 19 128.662 P2p

Fa6/24 Desg FWD 19 128.664 P2p

Fa6/25 Desg FWD 19 128.665 P2p

Fa6/27 Desg FWD 19 128.667 P2p

Fa6/28 Desg FWD 19 128.668 P2p

Fa6/29 Desg FWD 19 128.669 P2p

Fa6/31 Desg FWD 19 128.671 P2p

Fa6/32 Desg FWD 19 128.672 P2p

Fa6/34 Desg FWD 19 128.674 P2p

Fa6/35 Desg FWD 19 128.675 P2p

Fa6/36 Desg FWD 19 128.676 P2p

Fa6/38 Desg FWD 19 128.678 P2p

Fa6/41 Desg FWD 19 128.681 P2p

Fa6/43 Desg FWD 19 128.683 P2p

Fa6/46 Desg FWD 19 128.686 P2p

Fa6/48 Desg FWD 19 128.688 P2p

Fa7/1 Desg FWD 19 128.769 P2p

Fa7/2 Desg FWD 19 128.770 P2p

Fa7/3 Desg FWD 19 128.771 P2p

Fa7/5 Desg FWD 19 128.773 P2p

Fa7/9 Desg FWD 19 128.777 P2p

Fa7/11 Desg FWD 19 128.779 P2p

Fa7/12 Desg FWD 100 128.780 P2p

Fa7/15 Desg FWD 19 128.783 P2p

Fa7/16 Desg FWD 19 128.784 P2p

Fa7/17 Desg FWD 19 128.785 P2p

Fa7/18 Desg FWD 19 128.786 P2p

Fa7/19 Desg FWD 19 128.787 P2p

Fa7/20 Desg FWD 19 128.788 P2p

Fa7/23 Desg FWD 19 128.791 P2p

Fa7/24 Desg FWD 19 128.792 P2p

Fa7/32 Desg FWD 19 128.800 P2p

Fa7/42 Desg FWD 19 128.810 P2p

Fa7/48 Desg FWD 19 128.816 P2p

Fa8/1 Desg FWD 19 128.897 P2p

Fa8/3 Desg FWD 19 128.899 P2p

Fa8/4 Desg FWD 19 128.900 P2p

Fa8/5 Desg FWD 19 128.901 P2p

Fa8/6 Desg FWD 19 128.902 P2p

Fa8/7 Desg FWD 19 128.903 P2p

Fa8/9 Desg FWD 100 128.905 Shr

Fa8/10 Desg FWD 19 128.906 P2p

Fa8/11 Desg FWD 19 128.907 P2p

Fa8/12 Desg FWD 19 128.908 P2p

Fa8/13 Desg FWD 19 128.909 P2p

Fa8/15 Desg FWD 19 128.911 P2p

Fa8/16 Desg FWD 19 128.912 P2p

Fa8/17 Desg FWD 19 128.913 P2p

Fa8/20 Desg FWD 19 128.916 P2p

Fa8/21 Desg FWD 100 128.917 Shr

Fa8/22 Desg FWD 19 128.918 P2p

Fa8/23 Desg FWD 19 128.919 P2p

Fa8/24 Desg FWD 100 128.920 Shr

Fa8/29 Desg FWD 19 128.925 P2p

Fa8/32 Desg FWD 19 128.928 P2p

Fa8/34 Desg FWD 19 128.930 P2p

Fa8/38 Desg FWD 19 128.934 P2p

Fa8/41 Desg FWD 100 128.937 Shr

Fa8/43 Desg FWD 19 128.939 P2p

Po2 Root FWD 4 128.1665 P2p

Po16 Desg FWD 4 128.1670 P2p

Po1 Desg FWD 4 128.1671 P2p

Po5 Desg FWD 3 128.1673 P2p

SwitchCore2#sh cdp nei

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID Local Intrfce Holdtme Capability Platform Port ID

SwitchStack3750

Gi 10/10 147 R S I WS-C3750X-Gig 2/0/1

SwitchCore1

Gi 1/1 160 R S I WS-C6513-Gig1/1

And in pvst mode the network is stable but when Rapid-pvst is enabled the network flap (connected for about a minutes then 30 sec disconnected , reconnection for a minute again,...)

Thanks for your replie !!

Alexandre.Pieroux · ‎04-24-2013

NB: Here we can't se any "alt" port or "bckp" port because these link were down.

The alternative port is the link between the 2 cores

Alexandre.Pieroux · ‎04-29-2013

Here some news !

I've juste seen that some spanning-tree portfast was enabled on the link between core1 and the stack !

On the port of the stack the gig 1/0/1 have spann-tree protfast

and on the core 1 the port gig 10/10 have also spann-tree portfast enabled !

I know that's not a good practice and this can cause loops, these port are in trunking mode.

In rstp, port with spanning-tree portfast enabled make an edge port that doesn't participate in spanning-tree but if it receive BPDU it switch to non-edge port. Here spanning-tree portfast is enabled on the root bridge (the stack) and the core, so no BPDU are send by the root and the port is in forwarding state.

Can it be the reason of my problem ? I'm not sure about that but I look after it.

Alexandre.Pieroux · ‎05-03-2013

Anyone ?

Please someone help me.

blau grana · ‎05-03-2013

Hello Alex,

It is hard to say what is going on because we do not know topology and also switch configuration. Why are you using different STP modes on each switch, it can cause a lot of problems. I would configure same STP modes on each switch and then step by step try to diagnose a problem if any.

Best Regards

Please rate all helpful posts and close solved questions

Best Regards Please rate all helpful posts and close solved questions

Alexandre.Pieroux · ‎05-06-2013

Hello,

This is the probleme, has a student I can just configure these 3 switches, so I can't configure RSTP on the others. It's kind difficult to test or diagnose (these are critical). I post the configuration of the switches to help.

My goal is to implement RSTP only between these 3 switches and keep compatibility with the rest of the network.

I'm still studying the RSTP and how convergence work in detail but everythings seems better and faster than the STP.

Here the config file (as they work actually with STP, if I change to RSTP the network flap)

Thanks for your answer !!

Best regards

PS: I've found something new : there was a loop in the network (an interface on vlan 10 was enabled), since the day we've made the migration. Maybe this is the problem ?

Sorry for my bad english