Configure spanning tree from HP to Cisco hardware
- by Tim Brigham
I have three switches I'd like to configure in a loop - a Cisco stack (3750s) and two HP 2900 series. Each is connected to the next with a 10 gig backplane of one form or another.
How do I configure the spanning tree on these systems to make this function correctly? From the documents I've looked at it looks like I need to set both sets of hardware to use MST mode but I'm not sure past that point. The trunking, etc is all set up as needed.
HP Switch 1 A4 connected to Cisco 1/0/1.
HP Switch 2 B2 connected to Cisco 2/0/1.
HP Switch 1 A2 connected to HP Switch 2 A1.
HP Switch 1
show spanning-tree
Multiple Spanning Tree (MST) Information
STP Enabled : Yes
Force Version : MSTP-operation
IST Mapped VLANs : 1-4094
Switch MAC Address : 0021f7-126580
Switch Priority : 32768
Max Age : 20
Max Hops : 20
Forward Delay : 15
Topology Change Count : 352,485
Time Since Last Change : 2 secs
CST Root MAC Address : 0018ba-c74268
CST Root Priority : 1
CST Root Path Cost : 200000
CST Root Port : 1
IST Regional Root MAC Address : 0021f7-126580
IST Regional Root Priority : 32768
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
----- --------- + --------- ---- ---------- + ------------- ---- --- ----
...
A1 | Auto 128 Disabled |
A2 10GbE-CX4 | 2000 128 Forwarding | 0021f7-126580 2 Yes No
A3 10GbE-CX4 | Auto 128 Disabled |
A4 10GbE-SR | 2000 128 Forwarding | 0021f7-126580 2 Yes No
HP Switch 2
show spanning-tree
Multiple Spanning Tree (MST) Information
STP Enabled : Yes
Force Version : MSTP-operation
IST Mapped VLANs : 1-4094
Switch MAC Address : 0024a8-cd6000
Switch Priority : 32768
Max Age : 20
Max Hops : 20
Forward Delay : 15
Topology Change Count : 19,623
Time Since Last Change : 32 secs
CST Root MAC Address : 0018ba-c74268
CST Root Priority : 1
CST Root Path Cost : 202000
CST Root Port : A1
IST Regional Root MAC Address : 0024a8-cd6000
IST Regional Root Priority : 32768
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
----- --------- + --------- ---- ---------- + ------------- ---- --- ----
...
A1 10GbE-CX4 | 2000 128 Forwarding | 0021f7-126580 2 Yes No
A2 10GbE-CX4 | Auto 128 Disabled |
B1 SFP+SR | 2000 128 Blocking | a44c11-a67c80 2 Yes No
B2 | Auto 128 Disabled |
Cisco Stack 1
show spanning-tree
... (additional VLANs)
VLAN0100
Spanning tree enabled protocol ieee
Root ID Priority 1
Address 0018.bac7.426e
Cost 2
Port 107 (TenGigabitEthernet2/1/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32868 (priority 32768 sys-id-ext 100)
Address a44c.11a6.7c80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Te1/1/1 Desg FWD 2 128.53 P2p
Te2/1/1 Root FWD 2 128.107 P2p
