Core (4500x vss) with Access HP switch spanning tree

[john smith]

Hello Friends,

i need your support to guide me for this type of topology network in-order to avoid loops...

like

2  4500X series switch configure as a VSS working as core switch

in access layer i have HP switches which are connected with 1G fiber uplinks to each other (cascaded) and back to these Core switch for Vlan forwarding.

i need help to configure  spanning tree  for such topology and avoid loops.

Topology is in attached..

[Reza Sharifi]

Hi,

To make the design simple and to avoid loop, just connect

ASW-HP1

ASW-HP2

and

ASW-HP3

via 2 1Gig uplinks to both 4500 switches (VSS) and disconnect ASW-HP1 from ASW-HP2 and ASW-HP2 from ASW-HP3.

HTH

[john smith]

Hi Reza,

thanks for your reply,

you mean to say, connect each HP switch back to core (VSS) with 2 uplinks and configure as a ether-channel?

actually that is  not possible because the lack of fiber cable between the cabinets (core to access) are not much cores.

so i have to go through that topology.

any other idea please?

thanks

[Reza Sharifi]

Hi,

you mean to say, connect each HP switch back to core (VSS) with 2 uplinks and configure as a ether-channel?

Yes, exactly.

actually that is  not possible because the lack of fiber cable between the cabinets (core to access) are not much cores.

How could it not be possible? According to your drawing in your current design ASW-HP1 and ASW-HP3 both connect to the core VSS, core anyway. So it is just a matter of connecting ASW-HP2 to the core.

Of course you want 2 uplinks from each HP.

HTH

[krueffer]

Forgot to put the solution here. My colleague had switch on VTP pruning on the VSS.  He is using this as default setting for al his installations. Removing this command did the trick.

regards

Knut

[krueffer]

Hi,

would a spanning tree based design a shown in the topology not work at all or would it be not desirable?

regards

Knut

[eng.eslamany]

hi john

almost i have similar solution but i want to make sure the sfp is compatible or not.

can you help me as i have SFP-10G-SR in 4500-x and sfp j4858C in 5406 hp switch