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01-04-2014 04:15 PM
01-04-2014 04:15 PM
Hello. I am encountering a really hair-tearing issue here. I have a stack of HP 2910al running MSTP and a stack of Cisco SG500X units running MSTP.
I have identically configured instances and can show that the base spanning-tree process is recognizing that there is some topology change when i change the switch priority. The can trade off who is the CST Root. I am, however, unable to get the instance on the HP switch to recognize who is root.
I cannot pass traffic on any vlan, (except for native VL1).
Here we can see the HP 2910 switch recognizes the cisco switch as being the root (the basic spanning tree sees the designated bridge):
HP-SW-1(config)# sh spanning-tree
Multiple Spanning Tree (MST) Information
STP Enabled : Yes
Force Version : MSTP-operation
IST Mapped VLANs : 2-9,11-19,21-29,31-99,101-109,111-799,801-4094
Switch MAC Address : 38eaa7-75a780
Switch Priority : 8192
Max Age : 20
Max Hops : 20
Forward Delay : 15
Topology Change Count : 5
Time Since Last Change : 5 mins
CST Root MAC Address : d4d748-ccac1a < - The Cisco 500
CST Root Priority : 4096
CST Root Path Cost : 60000
CST Root Port : 1
IST Regional Root MAC Address : 38eaa7-75a780 < - MY HP 2910
IST Regional Root Priority : 8192
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
----- --------- + --------- ---- ---------- + ------------- ---- --- ----
1 100/1000T | 20000 64 Forwarding | 00147c-488b40 2 Yes No
BUT HERE, the HP switch sees itself to be the root bridge for the instance #1 – and the designated bridge is the HP2910 itself…
MP-SW-1(config)# sh spanning-tree instance 1
MST Instance Information
Instance ID : 1
Mapped VLANs : 1,10,20,30,100,110,800
Switch Priority : 8192
Topology Change Count : 5
Time Since Last Change : 9 mins
Regional Root MAC Address : 38eaa7-75a780
Regional Root Priority : 8192
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 Master Forwarding 38eaa7-75a780
Here’s my HP configuration (with fluff removed):
interface 1
name "Cisco Stack"
no power-over-ethernet
exit
vlan 10
name "Management"
tagged 1,Trk1-Trk2 < - NOTE: Vlan’s are all tagged on VL1
ip address 172.16.10.1 255.255.255.0
exit
spanning-tree
spanning-tree 1 priority 4
spanning-tree Trk1 priority 4
spanning-tree Trk2 priority 4
spanning-tree config-name "Irvine"
spanning-tree config-revision 1
spanning-tree instance 1 vlan 1 10 20 30 100 110 800
spanning-tree instance 1 Trk1 priority 4
spanning-tree instance 1 Trk2 priority 4
spanning-tree priority 2
The Cisco SX500 is not as robust of a CLI set as the commercial 3560’s etc. But here’s the way this unit looks:
spanning-tree mode mst
spanning-tree priority 4096
spanning-tree mst configuration
instance 1 vlan 1,10,20,30,100,110,800
name Irvine
revision 1
exit
spanning-tree mst 1 priority 4096
vlan database
vlan 10,20,30,100,110,800
interface gigabitethernet1/1/1
description "To other Core"
spanning-tree link-type point-to-point
spanning-tree mst 1 cost 20000
switchport trunk allowed vlan add 10,20,30,100,110,800
Solved! Go to Solution.
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01-05-2014 12:50 AM
01-05-2014 12:50 AM
Re: Procurve 2910al MSTP to Cisco SG500 MSTP not playing fair
I would guess this has to do with VLAN 1 not beeing allowed on the SG500 trunk. Also you might still have a problem if VLAN1 is tagged from the HP but untagged (native per default) on the SG500.
CCIE Service Provider
MASE Network Infrastructure [2011]
H3CSE
CCNP R&S
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01-05-2014 11:00 AM
01-05-2014 11:00 AM
Re: Procurve 2910al MSTP to Cisco SG500 MSTP not playing fair
I'd agree that there would be a problem if VL1 was blocked - but it is the only VLAN that is passing. I have VL10 set up as my management VLAN and have the appropriate L3 SVI's on each side. Should work.
I'm looking for any hints and tidbits!
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01-05-2014 11:02 AM
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01-05-2014 12:22 PM
01-05-2014 12:22 PM
Re: Procurve 2910al MSTP to Cisco SG500 MSTP not playing fair
According to your config, gigabitethernet1/1/1 on the Cisco is not allowing VLAN1. Doesn't matter if its the native VLAN, if its no inte allowed list it wont be used.
CCIE Service Provider
MASE Network Infrastructure [2011]
H3CSE
CCNP R&S
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01-06-2014 02:38 AM
01-06-2014 02:38 AM
Re: Procurve 2910al MSTP to Cisco SG500 MSTP not playing fair
I would check the MSTP configuration digests on both switches, if you are seeing multiple regional roots.
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01-06-2014 04:26 AM
01-06-2014 04:26 AM
Re: Procurve 2910al MSTP to Cisco SG500 MSTP not playing fair
Agreed - start with checking that the MSTP Digests match:
Cisco : show spanning-tree mst digest
HP : show spanning-tree mst-config
Regards,
Pete
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01-10-2014 12:05 AM
01-10-2014 12:05 AM
Re: Procurve 2910al MSTP to Cisco SG500 MSTP not playing fair
Hi guys - - thanks for the advice. The syntax for the show spanning-tree mst digest does not really exist on the SG500X switch. HOWEVER, with this comment, I did observe that the HP switch shows a RATHER LONG 0xNNNNNNNNNNNNNNN digest key. The Cisco does NOT.
Any other suggestions?
Oh, the advertised or permitted VLANS are identical and the revision is identical and the domain name is identical.
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01-10-2014 12:06 AM
01-10-2014 12:06 AM
Re: Procurve 2910al MSTP to Cisco SG500 MSTP not playing fair
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01-10-2014 12:08 AM
01-10-2014 12:08 AM
Re: Procurve 2910al MSTP to Cisco SG500 MSTP not playing fair
Here is the cisco equivalent to the suggested digest command:
switchccac1a#sh spanning-tree mst-configuration
Gathering information ..........
Current MST configuration
Name: Irvine
Revision: 1
Instance Vlans Mapped State
-------- ------------------------------------------------ -----
1 1,10,20,30,100,110,800 enabled
switchccac1a#
For the HP, this is what I see:
IRV_SHORETEL-0(config)# sh spanning-tree mst-config
MST Configuration Identifier Information
MST Configuration Name : Irvine MST Configuration Revision : 1 MST Configuration Digest : 0x4211DA627F7479E5EDD3B93099652B67
IST Mapped VLANs : 2-9,11-19,21-29,31-99,101-109,111-799,801-4094
Instance ID Mapped VLANs ----------- --------------------------------------------------------- 1 1,10,20,30,100,110,800