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https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/5234-5.html
Aug 17, 2006 · Spanning Tree Protocol (STP) is a Layer 2 protocol that runs on bridges and switches. The specification for STP is IEEE 802.1D. The main purpose of STP is to ensure that you do not create loops when you have redundant paths in your network. Loops are deadly to a network.
https://community.cisco.com/t5/networking-documents/how-to-disable-stp-on-a-per-port-basis-in-cisco-catalyst/ta-p/3132968
Resolution. By default, spanning tree runs on every port. The spanning tree feature cannot be turned off in switches on a per port basis. Although it is not recommended, you can turn off Spanning Tree Protocol (STP) on a per-VLAN basis, or globally on the switch. Use the no spanning-tree vlan vlan-id command in order to disable STP on a per virtual LAN (VLAN) basis.
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4000/8-2glx/configuration/guide/stp_enha.html
May 06, 2007 · PortFast BPDU guard prevents loops by moving a nontrunking port into an errdisable state when a BPDU is received on that port. When you enable BPDU guard on the switch, spanning tree shuts down PortFast-configured interfaces that receive BPDUs instead of putting them into the spanning tree blocking state.
https://www.experts-exchange.com/questions/22957392/Spanning-Tree-problems.html
I can create them on Nortels and assign interfaces to certain VLANs but they are not communicating with the Cisco 3550 VLANs. Some VLANs work perfectly (example VLAN100, VLAN60, VLAN61) but VLAN20 doesn't work. The Cisco 2960G switches have the following lines for spanning tree: # Cisco 2960G-1 spanning-tree mode mst
http://docs.ruckuswireless.com/fastiron/08.0.70/fastiron-08070-l2guide/GUID-3140FCF4-9B34-458B-8552-4249BF01D0C3.html
The number of spanning tree instances ranges from 1 through 254 on ICX 7750, ICX 7450, ICX 7250, and ICX 7650 devices. The range of STP instances on Ruckus ICX 7150 device is from 1 through 253. The default value is 128 on ICX 7750 and ICX 7650 devices and 32 on ICX 7450, ICX 7250, and Ruckus ICX 7150 devices.
https://learningnetwork.cisco.com/thread/15395
Jul 06, 2010 · Can I use Rapid Sptanning Tree With Cisco and Nortel 450 Switches? I assume the ports on the Cisco that the nortels are plugged into. with just drop down to 802.1d legacy spanning tree.
https://mpxxuk.wordpress.com/2015/12/26/icnd2-spanning-tree-notes/
Dec 26, 2015 · Spanning tree follows the following steps: Elect root bridge Elect root ports on non root bridges Elect one designated port per segment Ports transition to forwarding or blocking. Elections for root bridge: general rule: Lower is better. Priority (Default 32768) MAC address. Root port is the one which has the lowest cost to the root…
https://serverfault.com/questions/107281/network-topology-vlan-and-spanning-tree
If you need ~72 ports per floor, I'd possibly consider uplinking one switch to Core1 and the other to Core2, then cross-linking the switches and tweak the spanning tree to have either one of the floor switches or one of the cores as the root (depends on if your traffic is …
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