03-21-2012 08:19 AM - edited 03-07-2019 05:42 AM
Hello Everyone,
I have a network with spanning-tree mode mst, but, we want change this for spanning-tree mode rstp.
I have two cores(6500) and need know what is the better mode for change this with no impact in my network?
We dont have distributin layer, like a "topology" below.
ACCESS LAYER SWITCHES
|
|
---------------------------------
|CORE1 ------ CORE2 |
--------------------------------
|
|
SERVERS
CORE1 CONFIG
spanning-tree mode mst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
spanning-tree uplinkfast
spanning-tree backbonefast
!
spanning-tree mst configuration
name Balance
revision 1
instance 1 vlan 101, 103, 105, 107, 109, 111, 113, 115
instance 2 vlan 102, 104, 106, 108, 110, 112, 114, 116
instance 3 vlan 151-154
!
spanning-tree mst 1,3 priority 24576
spanning-tree mst 2 priority 28672
spanning-tree vlan 1 priority 8192
CORE2 CONFIG
spanning-tree mode mst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
spanning-tree uplinkfast
spanning-tree backbonefast
!
spanning-tree mst configuration
name Balance
revision 1
instance 1 vlan 101, 103, 105, 107, 109, 111, 113, 115
instance 2 vlan 102, 104, 106, 108, 110, 112, 114, 116
instance 3 vlan 151-154
!
spanning-tree mst 1,3 priority 28672
spanning-tree mst 2 priority 24576
spanning-tree vlan 1 priority 16384
Any ideas?
Tks a lot.
Rafael
03-29-2012 06:27 AM
Up!
03-30-2012 02:36 PM
May I ask what your goals are for this migration? MST has similar convergence timers to RSTP and is (in my opinion) a better choice to begin with, it offers a more scalable, customizable STP topology.
04-02-2012 07:39 AM
I need to migrate this becasuse the time of convergence in my network.
I want to know what is the best way to do this.
04-02-2012 09:33 AM
Rafael,
I absolutely agree with Kyle and Karthik here - MSTP is internally built on RSTP and if properly configured, it has the same speed of convergence. If you are having issues with MSTP convergence times then it is not configured properly, and you are not going to save yourself any work by performing a network-wide downgrade to RSTP. You could even run into issues if the number of VLANs created in your network exceeds the maximum count of allowed STP instances on your switches.
It would be better to inspect your MSTP configuration. How large is your network, how many switches are there and what is their MST configuration? How do you measure the convergence times and how exactly do you know there is a problem with it?
Best regards,
Peter
04-04-2012 10:37 AM
Hello Peter,
Sorry, i really don't know that.
I Have 50 access switches, and 2 core switches, connected in hight availability, like below.
ACCESS LAYER SWITCHES
| |
| |
---------------------------------
|CORE1 ------ CORE2 |
--------------------------------
|
|
SERVERS
MST configuration os present in my first post.
So, what is the better config? MST? RSTP? In the access switches, what is the best configuration? MST witch bpduguard and portfast?
Tks a lot!
03-30-2012 03:19 PM
Hi,
When MST is configured, RSTP is automatically enabled. To test enable "spanning tree portfast" on a port going to host and check sh spanning-tree mst
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide