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Beginner

Spanning tree mode on C3750 compatible with SG300?

Hello everyone,

In our computer park we have two C3750 in stack. The rest of the switches are Cisco SG300-28P.

Which way should I set for it to be compatible in both models and the C3750 model be the root?

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted

Try to configure instance 1

on 3750
spanning-tree mst configuration
name mymst
revision 1
instance 1 vlan 1-4096  [ use question mark if hyphen is not accepted]
spanning-tree mst 1 priority 4096

on sg300

spanning-tree mst configuration
name mymst
revision 1
instance 1 vlan 1-4096
spanning-tree mst 1 priority 61440

Masoud

View solution in original post

7 REPLIES 7
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Collaborator

Hello,

edited

SG300-28P supports RSTP and MSTP. The default is RSTP. Check the link below.

http://www.cisco.com/c/en/us/products/collateral/switches/small-business-smart-switches/data_sheet_c78-610061.pdf

http://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbms/sf30x_sg30x/administration_guide/CLI_Nikola300_1_3_7.pdf

3750 supports PVST MST Rapid PVST. The default is Rapid PVST.

****************************************

on 3750

spanning-tree mode mst

Spanning-tree mst 0 priority 4096

*******************************************

On others

spanning-tree mode mst

Spanning-tree mst 0 priority 61440

*************************************************************

 

Hope it helps,

Masoud

 

Highlighted

Hello Masoud,

Why you edited the post?

Highlighted

Hello,

I checked 3750 and noticed RSTP is not in the command sets so I edited my post. What you see you now will work on both 3750 on SG300.

Hope it helps,

Masoud

Highlighted

Masoud,

In sg300 no have instance 0 on the command: Spanning-tree mst 0 priority 61440

#spanning-tree mst
configuration Configure MSTP parameters
<1-7> Specify instance ID
max-hops Configure the maximum hops allowed in a region for a
Spanning Tree.

edited:

I try to set on 3750: "spanning-tree mst 1 priority 4096", but the priority always stay 32768 and when I set "spanning-tree mst 0 priority 4096" the priority stays 4096

Highlighted

Try to configure instance 1

on 3750
spanning-tree mst configuration
name mymst
revision 1
instance 1 vlan 1-4096  [ use question mark if hyphen is not accepted]
spanning-tree mst 1 priority 4096

on sg300

spanning-tree mst configuration
name mymst
revision 1
instance 1 vlan 1-4096
spanning-tree mst 1 priority 61440

Masoud

View solution in original post

Highlighted

Hello Masoud,

I set up that way and works very fine!!

Thanks for your help! Really thanks!

Highlighted

Hello,

You are most welcome. Happy to help.

Masoud

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