![]() ![]() If a BPDU is received on a PortFast enabled port, BPDU Guard disables it. If no BPDUs are received, Loop Guard prevents an alternate port from becoming the selected port. ![]() When there are many links and an STP failure, it would be beneficial to verify that we are receiving BPDUs on our alternate links, precisely what Loop Guard performs. External switches are protected from becoming root by Root Guard. You’ll need to use Root Guard to accomplish this. I always tell network designers that their root bridges need to be protected. Now STP is ran once for the entire MST instance, even if it includes 1000 VLANs Combine like traffic flows into a single MST instance Reduce the number of spanning-tree instances These features are critical in mitigating the slow convergence time of STP. PortFast allows a port, usually an access port, to transition to the forwarding state. UplinkFast allows for your access switches to have a fast uplink failover when an issue is determined.īackboneFast allows for a faster convergence time between devices with STP changes occur. To mitigate the performance issues with STP, new features were created, UplinkFast, BackboneFast, and PortFast. Rapid Per VLAN Spanning Tree + (Rapid-PVTS+) ![]() To mitigate STP’s slow convergence issues three other flavors of STP were created:Ģ. – Loop Guard: Prevents an alternate port from becoming the designated port if no BPDUs are received – Root Guard: Prevents external switches from becoming root – BPDU Guard: Disabled PortFast enabled ports if BPDU is received – PortFast: Fast access port transition, moves directly to the forwarding state – BackboneFast: Fast convergence between deices when STP changes occur – UplinkFast: Fast Uplink failover, used on access switches #STP – Non Rapid STP Improved Performance UDLD is a great option to use since STP won’t always catch the loop With HSRP, make sure these configs line up with the Spanning Tree design When you add a new switch, you want to make sure it does not become the root bridge! It will reconfigure your spanning domain and could reroute traffic! Pick two, one Primary Root and one Backup Root Don’t leave your Root Bridges to chance! Manually configure them! The lower the root ID the better it is, that switch will be the root bridge For better convergence use Rapid PVST+ or MST Do not Disable STP in a Layer 2 Network! You have one broadcast storm across multiple switches or multiple places on the network You can run across a lot of issues spanning VLANs across locations Only one will be active at a time to help prevent loops. Using STP, you have redundant links but you will not use them. You need to use the “switchport trunk allow vlan add” command. (WARNING)īe aware if you use the “switchport trunk allow vlan” command, you will wipe out all your VLANs if you do not list out all the VLANs. ![]() If you need to add a vlan, use the “ switchport trunk allow vlan add” command. Manually Prune Trunk links with the “ switchport trunk allow vlan” command. This resets the config revision, so you don’t bring down the network because the new switch has a higher revision #. I always set the switch to Transparent first and then configure it. VTPv3 is compatible with VTPv2 as long as you don’t use private/extended VLANs Configure all switches in transparent mode If your network only supports VTPv2, don’t use it Set interfaces to trunk or access and disable DTP The VTP device with the highest config revision is the keep (WARNING) Supported Modes: Client, Server, and Transparent ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |