Issues with MSTP on HP Procurves

fatmcgav · Jun 6, 2012

Hi there,

We're experiencing some network anomalies with our current HP Procurve switches...

We've got a Core/Distribution layout, which uses a pair of HP 2910al-24G at the core, with a Trunk pair of 1Gb Ethernet between them.
The relevant spanning-tree config looks like:
SWITCH01:

Code:

SWITHC01# show spanning-tree config

 Multiple Spanning Tree (MST) Configuration Information

  STP Enabled [No] : Yes
  Force Version [MSTP-operation] : MSTP-operation
  Default Path Costs [802.1t] : 802.1t
  MST Configuration Name : 002347c7b4c0
  MST Configuration Revision : 0        Switch Priority : 36864
  Forward Delay [15] : 15               Hello Time [2] : 2
  Max Age [20] : 20                     Max Hops [20] : 20

                  | Path      Prio  Admin Auto  Admin Hello  Root   TCN    BPDU
  Port  Type      | Cost      rity  Edge  Edge  PtP   Time   Guard  Guard  Flt
  ----- --------- + --------- ----- ----- ----- ----- ------ ------ ------ ----
  3     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  4     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  5     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  6     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  7     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  8     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  9     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  10    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  11    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  12    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  13    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  14    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  15    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  16    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  17    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  18    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  19    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  20    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  21    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  22    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  23    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  24    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  Trk1            | Auto      64    No    Yes   True  Global No     No     No

SWITCH01# show spanning-tree

 Multiple Spanning Tree (MST) Information

  STP Enabled   : Yes
  Force Version : MSTP-operation
  IST Mapped VLANs : 1-4094
  Switch MAC Address : 002347-c7b4c0
  Switch Priority    : 36864
  Max Age  : 20
  Max Hops : 20
  Forward Delay : 15

  Topology Change Count  : 97,622
  Time Since Last Change : 1 secs

  CST Root MAC Address : 002334-e10c00
  CST Root Priority    : 0
  CST Root Path Cost   : 200000
  CST Root Port        : 23

  IST Regional Root MAC Address : 002347-c7b4c0
  IST Regional Root Priority    : 36864
  IST Regional Root Path Cost   : 0
  IST Remaining Hops            : 20

  Root Guard Ports     :
  TCN Guard Ports      :
  BPDU Protected Ports :
  BPDU Filtered Ports  :
  PVST Protected Ports :
  PVST Filtered Ports  :

                  |           Prio             | Designated    Hello
  Port  Type      | Cost      rity  State      | Bridge        Time  PtP Edge
  ----- --------- + --------- ----- ---------- + ------------- ----- --- ----
  3     100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  4     100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  5     100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  6     100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  7     100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  8     100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  9     100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  10    100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  11    100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  12    100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  13    100/1000T | 2000000   128   Forwarding | 002347-c7b4c0 2     Yes No
  14    100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  15    100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes Yes
  16    100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes Yes
  17    100/1000T | Auto      128   Disabled   |
  18    100/1000T | Auto      128   Disabled   |
  19    100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes Yes
  20    100/1000T | Auto      128   Disabled   |
  21    100/1000T | Auto      128   Disabled   |
  22    100/1000T | Auto      128   Disabled   |
  23    100/1000T | 200000    128   Forwarding | 0023ab-dc0880 2     Yes No
  24    100/1000T | 200000    128   Blocking   | 0023ab-dc0880 2     Yes No
  Trk1            | 20000     64    Forwarding | 002347-c7b4c0 2     Yes No

SWITCH01# show spanning-tree instance ist

 IST Instance Information

  Instance ID : 0
  Mapped VLANs : 1-4094
  Switch Priority         : 36864

  Topology Change Count   : 99,013
  Time Since Last Change  : 3 secs

  Regional Root MAC Address : 002347-c7b4c0
  Regional Root Priority    : 36864
  Regional Root Path Cost   : 0
  Regional Root Port        : This switch is root
  Remaining Hops            : 20
                                                           Designated
  Port  Type      Cost      Priority Role       State      Bridge
  ----- --------- --------- -------- ---------- ---------- -------------
  3     100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  4     100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  5     100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  6     100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  7     100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  8     100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  9     100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  10    100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  11    100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  12    100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  13    100/1000T 2000000   128      Designated Forwarding 002347-c7b4c0
  14    100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  15    100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  16    100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  17    100/1000T Auto      128      Disabled   Disabled
  18    100/1000T Auto      128      Disabled   Disabled
  19    100/1000T 20000     128      Designated Forwarding 002347-c7b4c0
  20    100/1000T Auto      128      Disabled   Disabled
  21    100/1000T Auto      128      Disabled   Disabled
  22    100/1000T Auto      128      Disabled   Disabled
  23    100/1000T 200000    128      Root       Forwarding 0023ab-dc0880
  24    100/1000T 200000    128      Alternate  Blocking   0023ab-dc0880
  Trk1            20000     64       Designated Forwarding 002347-c7b4c0

SWITHC02:

Code:

SWITCH02# show spanning-tree config

 Multiple Spanning Tree (MST) Configuration Information

  STP Enabled [No] : Yes
  Force Version [MSTP-operation] : MSTP-operation
  Default Path Costs [802.1t] : 802.1t
  MST Configuration Name : 002347cb1380
  MST Configuration Revision : 0        Switch Priority : 40960
  Forward Delay [15] : 15               Hello Time [2] : 2
  Max Age [20] : 20                     Max Hops [20] : 20

                  | Path      Prio  Admin Auto  Admin Hello  Root   TCN    BPDU
  Port  Type      | Cost      rity  Edge  Edge  PtP   Time   Guard  Guard  Flt
  ----- --------- + --------- ----- ----- ----- ----- ------ ------ ------ ----
  3     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  4     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  5     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  6     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  7     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  8     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  9     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  10    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  11    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  12    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  13    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  14    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  15    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  16    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  17    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  18    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  19    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  20    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  21    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  22    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  23    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  24    100/1000T | Auto      128   No    Yes   True  Global No     No     No
  Trk1            | Auto      64    No    Yes   True  Global No     No     No

SWITHC02# show spanning-tree

 Multiple Spanning Tree (MST) Information

  STP Enabled   : Yes
  Force Version : MSTP-operation
  IST Mapped VLANs : 1-4094
  Switch MAC Address : 002347-cb1380
  Switch Priority    : 40960
  Max Age  : 20
  Max Hops : 20
  Forward Delay : 15

  Topology Change Count  : 121,430
  Time Since Last Change : 0 secs

  CST Root MAC Address : 002334-e10c00
  CST Root Priority    : 0
  CST Root Path Cost   : 200000
  CST Root Port        : 23

  IST Regional Root MAC Address : 002347-cb1380
  IST Regional Root Priority    : 40960
  IST Regional Root Path Cost   : 0
  IST Remaining Hops            : 20

  Root Guard Ports     :
  TCN Guard Ports      :
  BPDU Protected Ports :
  BPDU Filtered Ports  :
  PVST Protected Ports :
  PVST Filtered Ports  :

                  |           Prio             | Designated    Hello
  Port  Type      | Cost      rity  State      | Bridge        Time  PtP Edge
  ----- --------- + --------- ----- ---------- + ------------- ----- --- ----
  3     100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  4     100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  5     100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  6     100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  7     100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  8     100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  9     100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  10    100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  11    100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  12    100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  13    100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  14    100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes No
  15    100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes Yes
  16    100/1000T | 20000     128   Forwarding | 002347-cb1380 2     Yes Yes
  17    100/1000T | Auto      128   Disabled   |
  18    100/1000T | Auto      128   Disabled   |
  19    100/1000T | Auto      128   Disabled   |
  20    100/1000T | Auto      128   Disabled   |
  21    100/1000T | Auto      128   Disabled   |
  22    100/1000T | Auto      128   Disabled   |
  23    100/1000T | 200000    128   Forwarding | 0023ab-dc3680 2     Yes No
  24    100/1000T | 200000    128   Blocking   | 0023ab-dc3680 2     Yes No
  Trk1            | 20000     64    Blocking   | 002347-c7b4c0 2     Yes No

SWITCH02# show spanning-tree instance ist

 IST Instance Information

  Instance ID : 0
  Mapped VLANs : 1-4094
  Switch Priority         : 40960

  Topology Change Count   : 122,474
  Time Since Last Change  : 3 secs

  Regional Root MAC Address : 002347-cb1380
  Regional Root Priority    : 40960
  Regional Root Path Cost   : 0
  Regional Root Port        : This switch is root
  Remaining Hops            : 20
                                                           Designated
  Port  Type      Cost      Priority Role       State      Bridge
  ----- --------- --------- -------- ---------- ---------- -------------
  3     100/1000T 20000     128      Designated Forwarding 002347-cb1380
  4     100/1000T 20000     128      Designated Forwarding 002347-cb1380
  5     100/1000T 20000     128      Designated Forwarding 002347-cb1380
  6     100/1000T 20000     128      Designated Forwarding 002347-cb1380
  7     100/1000T 20000     128      Designated Forwarding 002347-cb1380
  8     100/1000T 20000     128      Designated Forwarding 002347-cb1380
  9     100/1000T 20000     128      Designated Forwarding 002347-cb1380
  10    100/1000T 20000     128      Designated Forwarding 002347-cb1380
  11    100/1000T 20000     128      Designated Forwarding 002347-cb1380
  12    100/1000T 20000     128      Designated Forwarding 002347-cb1380
  13    100/1000T 20000     128      Designated Forwarding 002347-cb1380
  14    100/1000T 20000     128      Designated Forwarding 002347-cb1380
  15    100/1000T 20000     128      Designated Forwarding 002347-cb1380
  16    100/1000T 20000     128      Designated Forwarding 002347-cb1380
  17    100/1000T Auto      128      Disabled   Disabled
  18    100/1000T Auto      128      Disabled   Disabled
  19    100/1000T Auto      128      Disabled   Disabled
  20    100/1000T Auto      128      Disabled   Disabled
  21    100/1000T Auto      128      Disabled   Disabled
  22    100/1000T Auto      128      Disabled   Disabled
  23    100/1000T 200000    128      Root       Forwarding 0023ab-dc3680
  24    100/1000T 200000    128      Alternate  Blocking   0023ab-dc3680
  Trk1            20000     64       Alternate  Blocking   002347-c7b4c0

These switches host 2 separate port-based VLANs:

Code:

ACT-STAR-SW01# show vlans

 Status and Counters - VLAN Information

  Maximum VLANs to support : 256
  Primary VLAN : PROD
  Management VLAN :

  VLAN ID Name                 | Status     Voice Jumbo
  ------- -------------------- + ---------- ----- -----
  1       DEFAULT_VLAN         | Port-based No    No
  118     DMZ                  | Port-based No    No
  119     PROD                 | Port-based No    No

These VLAN ID's match the upstream VLAN ID's of the supplier network we're uplinking into.
VLAN 118 only exists on a couple of the distribution switches that host DMZ kit, VLAN 119 exists on all distribution switches...

Upstream of these switches is our hosting providers network, which we don't really know much about, other than it's Cisco kit, and we've set a lower priority on our Core switches as to not interfere with their platform. The upstream services link into ports 23 and 24.

From the Core switches, we've then got a distribution layer which is responsible for local rack connectivity. These consist of HP 2810-48G switches in pairs in the rack, with redundant upstream connections to SWITCH01 and SWITCH02.
E.g: SWITCH03 Port1 goes to SWITCH01, SWITCH03 Port2 goes to SWITCH02, SWITCH04 Port1 goes to SWITCH01, SWITCH04 Port2 goes to SWITCH02...

One issue I can see looking through the distribution layer switches, is that they all seem to be treating themselves as the Regional Root switch. My understanding of STP is that this is bad...
E.g.:

Code:

SWITCH03# show spanning-tree instance ist

 IST Instance Information

  Instance ID : 0
  Mapped VLANs : 1,118,119

  Switch Priority         : 61440

  Topology Change Count   : 32
  Time Since Last Change  : 18 days

  Regional Root MAC Address : b439d6-00aac0
  Regional Root Priority    : 61440
  Regional Root Path Cost   : 0
  Regional Root Port        : This switch is root
  Remaining Hops            : 20
                                                           Designated
  Port  Type      Cost      Priority Role       State      Bridge
  ----- --------- --------- -------- ---------- ---------- -------------
  1     100/1000T 20000     128      Root       Forwarding 002347-c7b4c0
  2     100/1000T 20000     128      Alternate  Blocking   002347-cb1380
  3     100/1000T 20000     128      Designated Forwarding b439d6-00aac0
  4     100/1000T 20000     128      Designated Forwarding b439d6-00aac0
...

SWITHC03# show spanning-tree config

 Multiple Spanning Tree (MST) Configuration Information

  STP Enabled [No] : Yes
  Force Version [MSTP-operation] : MSTP-operation
  Default Path Costs [802.1t] : 802.1t
  MST Configuration Name : b439d600aac0
  MST Configuration Revision : 0        Switch Priority : 61440
  Forward Delay [15] : 15               Hello Time [2] : 2
  Max Age [20] : 20                     Max Hops [20] : 20

                  | Path      Prio  Admin Auto  Admin Hello  Root   TCN    BPDU
  Port  Type      | Cost      rity  Edge  Edge  PtP   Time   Guard  Guard  Flt
  ----- --------- + --------- ----- ----- ----- ----- ------ ------ ------ ----
  1     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  2     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  3     100/1000T | Auto      128   No    Yes   True  Global No     No     No
  4     100/1000T | Auto      128   No    Yes   True  Global No     No     No
...

SWITCH03# show spanning-tree

 Multiple Spanning Tree (MST) Information

  STP Enabled   : Yes
  Force Version : MSTP-operation
  IST Mapped VLANs : 1,118,119

  Switch MAC Address : b439d6-00aac0
  Switch Priority    : 61440
  Max Age  : 20
  Max Hops : 20
  Forward Delay : 15

  Topology Change Count  : 32
  Time Since Last Change : 18 days

  CST Root MAC Address : 002334-e10c00
  CST Root Priority    : 0
  CST Root Path Cost   : 220000
  CST Root Port        : 1

  IST Regional Root MAC Address : b439d6-00aac0
  IST Regional Root Priority    : 61440
  IST Regional Root Path Cost   : 0
  IST Remaining Hops            : 20

  Root Guard Ports :
  TCN Guard Ports  :
  Protected Ports :
  Filtered Ports :

                  |           Prio             | Designated    Hello
  Port  Type      | Cost      rity  State      | Bridge        Time  PtP Edge
  ----- --------- + --------- ----- ---------- + ------------- ----- --- ----
  1     100/1000T | 20000     128   Forwarding | 002347-c7b4c0 2     Yes No
  2     100/1000T | 20000     128   Blocking   | 002347-cb1380 2     Yes No
  3     100/1000T | 20000     128   Forwarding | b439d6-00aac0 2     Yes Yes
  4     100/1000T | 20000     128   Forwarding | b439d6-00aac0 2     Yes Yes
...

I've also been reading the HP 'Advanced Traffic Management Guide', and that suggests that you should create an instance per VLAN. Is this valid?

How else could I simplify this set-up and get the best out of it?

Apologies for the length, and thanks in advance for any information.

Regards
Gavin

VinceWhirlwind · Jun 6, 2012

I really wouldn't recommend per-VLAN STP.

There's definitely something very ugly going on there for you.

I would sit down and draw up your network and plan your spanning tree properly from scratch and then implement it.

(The first problem is you've got Procurve 2910s in your "core". Terrible choice. Your "Core" should be a pair of stackable layer3 switches).

The first thing I would change urgently is: your Spanning-tree priority on Switch 1 to 4096, and switch 2 to 8192. I have no idea what those values are that you've got there, but they don't look good.

Then,
- check the "trunk" configuration between the two 2910s. make sure it's good. check vlan config is absolutely identical on all trunked-together ports
- check to make sure all switches are running the same version of spanning-tree

fatmcgav · Jun 7, 2012

VinceWhirlwind

Cheers for the info.

The network as it stands looks like this:

Unfortunately I'm not a networking expert, so am not sure what constitutes best practise for Spanning Tree design.
I also agree that the core is far from ideal, and we're planning on changing the core next year for a HP chassis switch which is more suitable for the job. However in the mean time we'd like to get these issues resolved...

The Priorities that are set on these switches are as high as they are due to the upstream network configuration.
The relevant config looks like:

Code:

SWITCH01# show config
...
spanning-tree
spanning-tree Trk1 priority 4
spanning-tree priority 9

SWITCH02# show config
...
spanning-tree
spanning-tree Trk1 priority 4
spanning-tree priority 10

With regards to the Trunks, as far as I can see it all looks configured correctly:

Code:

 SWITCH01# show trunks

 Load Balancing

  Port | Name                             Type      | Group Type
  ---- + -------------------------------- --------- + ----- --------
  1    |                                  100/1000T | Trk1  Trunk
  2    |                                  100/1000T | Trk1  Trunk


SWITCH01# show vlans ports Trk1

 Status and Counters - VLAN Information - for ports Trk1

  VLAN ID Name                 | Status     Voice Jumbo
  ------- -------------------- + ---------- ----- -----
  118     DMZ                  | Port-based No    No
  119     PROD                 | Port-based No    No

...

SWITCH02# show trunks

 Load Balancing

  Port | Name                             Type      | Group Type
  ---- + -------------------------------- --------- + ----- --------
  1    |                                  100/1000T | Trk1  Trunk
  2    |                                  100/1000T | Trk1  Trunk


SWITCH02# show vlans ports Trk1

 Status and Counters - VLAN Information - for ports Trk1

  VLAN ID Name                 | Status     Voice Jumbo
  ------- -------------------- + ---------- ----- -----
  118     DMZ                  | Port-based No    No
  119     PROD                 | Port-based No    No

From the previous show spanning-tree config outputs, it looks like all the switches are running the same spanning-tree version, all look set to 'MSTP-operation'...

Any further info welcome.

Cheers again.
Gavin

VinceWhirlwind · Jun 11, 2012

Nice diagram.

Your problem is the spanning tree priorities your hosting provider has set. I assume these two routers are doing your inter-VLAN routing?
You can see from your "show spanning-tree" that your spanning-tree topology is in a continuous cycle of reconfiguring itself due to the provider putting the same priority on both its "routers". (What are they, really?)

The provider should really have two routed ports presented on your site, each patched into one of your switches, and doing HSRP or VRRP and not participating in your spanning-tree. OR, they should be configured properly for spanning-tree.

fatmcgav · Jun 12, 2012

Unfortunately I don't know much about the upstream network, other than they've got multiple layers of distribution and core switches.
I can also confirm that the Firewall is responsible for any inter-VLAN routing.

It would also appear that the Cisco switches have recently been configured to use MSTP.

It's also probably not clear on the diagram, but we've been provided 4 uplinks into their network, which are meant to be 2 per VLAN. However it appears that both VLANs work on all links, which has meant we've mis-configured the uplinks our side. So rather than having 118 on one active uplink, and 119 on another, we've got both 118 and 119 on the same uplink from each switch. This has been on the to-do list to fix for a while, but we haven't had the opportunity as yet... So not sure if this is further complicating matters...

VinceWhirlwind · Jun 13, 2012

Well, get rid of the criss-cross redundancy for the moment then.

Then have a look at your "sh spanning-tree" and see if that stops it form re-configuring its topology every few seconds.

Your provider allowing all VLANs to work sounds like they just aren't filtering VLANs on their trunks. It sounds like they really haven't put much effort into setting this up correctly with you. The VLANs aren't really a problem - set them up so both VLANs are available on the trunks to each router, but have each router patched into one of your switches each, not both of them.

So

R1 R2
| |
| |
S1-------S2

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Issues with MSTP on HP Procurves

fatmcgav

Technical User

VinceWhirlwind

Technical User

fatmcgav

Technical User

VinceWhirlwind

Technical User

fatmcgav

Technical User

VinceWhirlwind

Technical User

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