Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 245

ethernet1/1/6:3 Root 128.282 128 2000 FWD 0 AUTO No ethernet1/1/6:4 Altr 128.283 128 2000 BLK 0 AUTO No EdgePort forward traffic EdgePort allows the interface to forward traffic approximately 30 seconds sooner as it skips the Blocking and Learning states. The spanning-tree bpduguard enable command causes the interface hardware to shut down when it receives a BPDU. CAUTION: Configure EdgePort only on links connecting to an end station. EdgePort can cause loops if you enable it on an interface connected to a network. • Enable EdgePort on an interface in INTERFACE mode. spanning-tree port type edge Configure EdgePort and view interface status OS10(conf-if-eth1/1/5)# spanning-tree port type edge View interface status OS10# show spanning-tree interface ethernet 1/1/5 ethernet1/1/5 of RSTP 1 is designated Forwarding Edge port:yes port guard :none (default) Link type is point-to-point (auto) Boundary: YES bpdu filter :disable bpdu guard :disable bpduguard shutdown-on- violation :disable RootGuard: disable LoopGuard disable Bpdus (MRecords) sent 610, received 5 Interface Designated Name PortID Prio Cost Sts Cost Bridge ID PortID ethernet1/1/5 128.272 128 500 FWD 0 32768 90b1.1cf4.a911 128.272 Spanning-tree extensions STP extensions ensure efficient network convergence by securely enforcing the active network topology. OS10 supports BPDU filtering, BPDU guard, loop guard, and root guard STP extensions. BPDU filtering BPDU guard Root guard Loop guard Protects the network from unexpected flooding of BPDUs from an erroneous device. Enabling BPDU Filtering instructs the hardware to drop BPDUs and prevents flooding from reaching the CPU. BPDU filtering is enabled by default on Edge ports. All BPDUs received on the Edge port are dropped. If you explicitly configure BPDU filtering on a port, that port drops all BPDUs that it receives. Blocks the L2 bridged ports and LAG ports connected to end hosts and servers from receiving any BPDUs. When you enable BPDU guard, it places a port (bridge or LAG) in an Error_Disable or Blocking state if the port receives any BPDU frames. In a LAG, all member ports (including new members) are placed in an Blocking state. The network traffic drops but the port continues to forward BPDUs to the CPU that are later dropped. To prevent further reception of BPDUs, configure a port to shut down using the shutdown command. The port can only resume operation from the Shutdown state after manual intervention. Avoids bridging loops and preserves the root bridge position during network transitions. STP selects the root bridge with the lowest priority value. During network transitions, another bridge with a lower priority may attempt to become the root bridge and cause unpredictable network behavior. Configure the spanning-tree guard root command to avoid such an attempt and preserves the position of the root bridge. Root guard is enabled on ports that are designated ports. The root guard configuration applies to all VLANs configured on the port. Prevents L2 forwarding loops caused by a hardware failure (cable failure or an interface fault). When a hardware failure occurs, a participating spanning tree link becomes unidirectional and a port stops receiving BPDUs. When a blocked port stops receiving BPDUs, it transitions to a Forwarding state causing spanning tree loops in the network. You can enable loop guard on a port that transitions to the Loop-Inconsistent state until it receives Layer 2 245