Need some help on MST

^^

Ok, decided to use the 6024 has one core switch.

switch 1 3448 g3 --->>>6024
switch 1 3448 g4 --->>>6024

I configured the 3448/6024 for MST with the Regions 0 and 1.
Region 1 has only vlan 2000 and Region 0 has the rest.

On the 3448, MST configuration is enabled and set correctly.
I still see from running "show spanning-tree blockedports" that g4 is BLK for both regions.

What do I need to do from here?

Can you post your configurations for your switches?  It will help us understand the setup.

Cuong.

I configured a 3424 and a 3448 the same way. I still get blocked ports in spanning-tree.


spanning-tree mode mstp
interface ethernet e1
spanning-tree portfast
exit
spanning-tree mst configuration
instance 1 add vlan 2000
exit
interface range ethernet g(3-4)
switchport mode general
exit
vlan database
vlan 1000,2000
exit
interface ethernet g3
switchport general pvid 1000
exit
interface ethernet g4
switchport general pvid 2000
exit
interface ethernet g3
switchport general allowed vlan add 1000 untagged
exit
interface ethernet g4
switchport general allowed vlan add 2000 untagged
exit
interface ethernet e1
switchport access vlan 2000
exit
interface vlan 2000
ip address 172.18.0.1 255.255.0.0
exit



-------------switch02-----------------

spanning-tree mode mstp
interface ethernet e1
spanning-tree portfast
exit
spanning-tree mst configuration
instance 1 add vlan 2000
exit
interface range ethernet g(3-4)
switchport mode general
exit
vlan database
vlan 1000,2000
exit
interface ethernet g3
switchport general pvid 1000
exit
interface ethernet g4
switchport general pvid 2000
exit
interface ethernet g3
switchport general allowed vlan add 1000 untagged
exit
interface ethernet g4
switchport general allowed vlan add 2000 untagged
exit
interface ethernet e1
switchport access vlan 2000
exit
interface vlan 2000
ip address 172.18.0.2 255.255.0.0
exit

Can I assume that the first set of configuration data is for the 34xx (switch 1) and the second set of configuration information which you refer to as "switch 2" is for the 6024?

Cuong.

Ok.  I see.  So the test setup is using only 34xx and no 6024.  That's fine.  We'll try with that.

Cuong.

All of the 3448's I have in production are using the same config that connect to the 6024. All of them have the Same regions setup as well to match the 6024.

I just want to see if I can get it working in my lab first to ensure no downtime accures. This why I configure 2 34xx to match what i have in production, minus the 6024.

BTW, can you also do a "show spanning-tree blockports" on your test setup and post the result here please.

Thanks,

Cuong.

Yes in my production I have 4x3448 configured to use MST with Regions setup the same as I posted. They connect to a single 6024 with MSt enabled and using the same regions.

I did not want to cause downtime for my clients and that is why I configured 2x34XX switchs in my lab with the same config. the results are the same that I see in my production with the 6024.

The configs that I posted are from my test lab.


Switch1 g3 ---> switch02 g3
switch1 g4 ---> switch02 g4

switch01


Gathering information ..........
###### MST 0 Vlans Mapped: 1-1999,2001-4094
CST Root ID Priority 32768
Address 00:13:72:ed:58:da
This switch is root for CST and IST master
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Max hops 20
Name State Prio.Nbr Cost Sts Role PortFast Type
------ -------- -------- --------- ------ ---- -------- -----------------




###### MST 1 Vlans Mapped: 2000

Root ID Priority 32768
Address 00:13:72:ed:58:da
This switch is the regional Root
Interfaces
Name State Prio.Nbr Cost Sts Role PortFast Type
-------- -------- -------- ------- ---- ---- -------- ----------

switch01#

---------------------------------switch2-------------------------------------



Spanning tree enabled mode MSTP
Default port cost method: short


Gathering information ..........
###### MST 0 Vlans Mapped: 1
CST Root ID Priority 32768
Address 00:13:72:ed:58:da
Path Cost 4
Root Port g3
This switch is the IST master
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32768
Address 00:13:72:f0:ab:16
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Max hops 20
Name State Prio.Nbr Cost Sts Role PortFast Type
------ -------- -------- --------- ------ ---- -------- -----------------
g4 enabled 128.52 4 DSCR Altn No P2p Bound (STP)




###### MST 1 Vlans Mapped: 2000

Root ID Priority 32768
Address 00:13:72:f0:ab:16
This switch is the regional Root
Interfaces
Name State Prio.Nbr Cost Sts Role PortFast Type
-------- -------- -------- ------- ---- ---- -------- ----------
g4 enabled 128.52 4 DSCR Bund No P2p Bound (STP)

switch02#


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

I have forwarded your question to some other engineers who understand MSTP on these switches better then I do.  I'm waiting for their response.  I'll post their answers here as soon as I get something from them.

Cuong.

thanks!

any updates on this??