What is the best way to implement a switch stack downlink ports? stp?

[aannuupp1]

Switch A and Switch B are already configured as in the diagram.

Trying to add a switch stack upstream of A and B

Currently, interface 1/2 cabling does not exist. and 1/1 has IP address 10.0.0.150/24

Solutions.....

1. On switchstack Configure SVI on Vlan 10 and (switchport access VLAN 10) down 1/1 and 1/2?

2. Or configure an IP address on interface 1/1 or 1/2 ?

3. is there a way to implement a port channel?

How does the spanning tree behave? What is recommended solution?

 

[Leo Laohoo]

Keep it simple:  Remove the link between Switch A and Switch B.  

The uplinks from the access switch to the 3750X stack should be going to the switch members (one each) and then etherchannel.  

Forming a "pyramid" is just "old school" and "textbook" cases.  In large deployment, no one does that anymore.

[balaji.bandi]

The best approach is to make it longer stable.

1. Move the VLAN Layer3 Interface towards Stack 10.0.0.254 VLAN 10

2. Make a Trunk port between Stack switch and Switch A (if you have more ports, make a port-channel in case 1 link fail other can take care) spread the links stack different switch,

3. Make a Trunk port between Stack switch and Switch B  (same case as above)

4. Remove the Link between Switch A and B, this will have no spanning-tree loops.

Note: the suggestion made based on the information, thinking all in the same Campus Lan.

Other notes: Maybe a typo i guess here, your Pc left side IP address and VLAN 10 IP address of SwitchB is the same?

[aannuupp1]

Other notes: Maybe a typo i guess here, your Pc left side IP address and VLAN 10 IP address of SwitchB is the same?

--Yes same subnet, vlan 10 (10.0.0.0/24) all over.

[balaji.bandi]

I mean your PC 10.0.0.10/24  also same IP configured vlan 10 on switch B 10.0.0.10/24

[aannuupp1]

Typo, yup. Thanks.

[balaji.bandi]

make it streamline below diagram help you : since you got opportunity  correct it ( so you can use IP address in good way)

[Joseph W. Doherty]

I too would recommend a topology like @balaji.bandi shows.

Additionally, would try to avoid running the same VLAN across multiple (separate - like your switches A and B) switches.  Would also recommend cross stack links from you stack up to the "core router" (might be L2 PO or L3 p2p).

One of the major feature of a stack is to minimize single points of failure.