Reference Guide

Root ID Priority 32768, Address 3417.4455.667f
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 36864, Address 90b1.1cf4.a523
Configured hello time 2, max age 20, forward delay 15
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
----------------------------------------------------------------------
ethernet1/1/6:3 128.282 128 2000 FWD 0 32768 3417.4455.667f 128.152
ethernet1/1/6:4 128.283 128 2000 BLK 0 32768 3417.4455.667f 128.153
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
-----------------------------------------------------------------
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
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.
BPDU guard 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.
228 Layer 2