Dell MX5108n OS10 Enterprise Edition User Guide for PowerEdge MX IO Modules Re - Page 215

ethernet1/1/6 128.280 128 500 BLK 0 32768 3417.4455.667f Interface Name Role PortID Prio Cost Sts Cost Link-type Edge ethernet1/1/5 Root 128.276 128 500 FWD 0 AUTO No ethernet1/1/6 Altr 128.280 128 500 BLK 0 AUTO No 128.150 Interface parameters Adjust two interface parameters to increase or decrease the likelihood that a port becomes a forwarding port. Port cost Port priority Value that is based on the interface type. The greater the port cost, the less likely the port is selected to be a forwarding port. Influences the likelihood that a port is selected to be a forwarding port if several ports have the same port cost. Default values for port cost by interface: • 100-Mb/s Ethernet interfaces - 200000 • 1-Gigabit Ethernet interfaces - 20000 • 10-Gigabit Ethernet interfaces - 2000 • Port-channel with 100 Mb/s Ethernet interfaces - 180000 • Port-channel with 1-Gigabit Ethernet interfaces - 18000 • Port-channel with 10-Gigabit Ethernet interfaces - 1800 1 Change the port cost of an interface in INTERFACE mode (0 to 200000000). spanning-tree msti number cost cost 2 Change the port priority of an interface in INTERFACE mode (0 to 240 in increments of 16, default 128). spanning-tree msti number priority priority View MSTi interface configuration OS10(conf-if-eth1/1/7)# do show spanning-tree msti 0 interface ethernet 1/1/7 ethernet1/1/7 of MSTI 0 is Designated Forwarding Edge port: No (default) Link type: point-to-point (auto) Boundary: Yes, Bpdu-filter: Disable, Bpdu-Guard: Disable, Shutdown-on-Bpdu-Guard-violation: No Root-Guard: Disable, Loop-Guard: Disable Bpdus (MRecords) Sent: 69, Received: 0 Interface Designated Name PortID Prio Cost Sts Cost Bridge ID PortID ethernet1/1/7 0.284 0 1 FWD 0 32768 90b1.1cf4.9b8a 0.284 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. When you implement BPDU guard, although the interface is placed in Error Disabled state when receiving the BPDU, the physical interface remains in the Up state. The hardware discards regular network traffic after a BPDU violation. BPDUs are forwarded to the CPU, where they are discarded as well. • Enable EdgePort on an interface in INTERFACE mode. spanning-tree port type edge Layer 2 215