By Hutton, Keith
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Additional info for Authorized self-study guide: designing Cisco network service architectures (ARCH)
The bridge priority for the specified VLAN is set to 8192 if this value will cause the switch to become the root for the VLAN. If any bridge for the VLAN has a priority lower than 8192, the switch sets the priority to one less than the lowest bridge priority Manually placing the primary and secondary bridges along with enabling STP toolkit options enables you to support a deterministic configuration where you know which ports should be forwarding and which ports should be blocking. Note Defining the root bridge under MST is done using the spanning-tree mst instance_id root primary.
The separate instance supports PortFast, UplinkFast, BackboneFast, BPDU guard, BPDU filter, root guard, and loop guard. 1D-2004 version is an updated version of the STP standard. Multiple Spanning Tree (MST) is an IEEE standard inspired from the earlier Cisco proprietary Multi-Instance Spanning Tree Protocol (MISTP) implementation. MST maps multiple VLANs into the same spanning-tree instance. 1w) and combines many VLANs with the same physical and logical topology into a common RSTP instance. Each instance supports PortFast, UplinkFast, BackboneFast, BPDU guard, BPDU filter, root guard, and loop guard.
PortFast*: Causes a Layer 2 LAN interface configured as an access port to enter the forwarding state immediately, bypassing the listening and learning states. Use PortFast only when connecting a single end station to a Layer 2 access port. UplinkFast: Provides from three to five seconds convergence after a direct link failure and achieves load balancing between redundant Layer 2 links using uplink groups. BackboneFast: Cuts convergence time by max_age for indirect failure. BackboneFast is initiated when a root port or blocked port on a network device receives inferior bridge protocol data units (BPDU) from its designated bridge.