Need to configure STP in Core and access switches

[SBaseeruddin]

there is no core switch and more than two access switches are i want to configure STP in both Core & Access switches. and they are two vlans 

vlan 1 & 15

i need to configure spanning tree in both core and access switches to avoid loop for fiber links

can any body the configuration in core and access

[hany_elsayed]

(config) # spanning-tree enable 

this is simple command to enable STP

and there are more options

[parnassus]

Can you simply draw your Network Topology?

The idea is that you should have a Network Topology that is not requiring you to setup Rapid Spanning Tree (RSTP) but plan to enable and configure it to have a more robust network.

So I suggest you to assign spanning tree priority 0 (the highest priority) to the STP Root switch, assign lower priorities (e.g. 8 or 15) to non STP Root switches (commonly these switches are distribution and/or access ones), protect STP Root switch's ports used to downlink to distribution/access switches with root guard option (so superior BPDU received on those ports are filtered avoiding that a distribution/access switch will become root if wrongly configured or inserted into your topology), enable adming-edge port and bpdu-protection along with loop-protect options on access switches' edge ports (ports with hosts connected such as Servers, Clients). Clearly there are a lot of other options and considerations that can be discussed but...generally this approach could be considered sufficient to start with (R)STP.

[FlorinD32]

Good afternoon,

Same issue for me, my network topology is the following, each floor has 2-3 cabinets with 4x2930M (stacking), each edge switch has 2xSFP, each fiber going to Server room, reaching 4 x Core Switches  (HP-Switch-5406Rzl2).  Multiple Vlans are transported in server room. Basically each edge switch has one uplink (main), the other one is for backup, I've tried STP Mode : RPVST. So far, each edge switch has STP enabled, no other setting. Can you please tell me how exactley should i configure the Core sw and the Edge SW? Thank you.