Nexus STP-Lite feature (Nexus 7000)

STP Lite

FCoE does not require full Spanning Tree Protocol (STP) because FCoE has no bridging functionality, which means that no STP loops are created in the network. STP Lite on FCoE interfaces ensures rapid convergence across the network by sending an agreement Bridge Protocol Data Unit (BPDU) whenever it receives a proposal BPDU. The FCoE link sends the identical agreement BPDU in response to either an Multiple Spanning Tree (MST) or a Per VLAN Rapid Spanning Tree Plus (PVRST+) proposal BPDU. Additionally, STP Lite suppresses the MAC address flushing function for FCoE VLANs.

STP Lite is enabled automatically by default across the entire device for FCoE VLANs as soon as the first FCoE VLAN comes up. At the same time, the system automatically converts all FCoE links as the STP-type normal ports. This feature runs only in FCoE VLANs.

show spanning-tree summary
Switch is in rapid-pvst mode
Root bridge for: VLAN0010
Port Type Default is disable
Edge Port [PortFast] BPDU Guard Default is enabled
Edge Port [PortFast] BPDU Filter Default is enabled
Bridge Assurance is enabled
Loopguard Default is disabled
Pathcost method used is long
STP-Lite is enabled

Name Blocking Listening Learning Forwarding STP Active
———————- ——– ——— ——– ———- ———-
VLAN0010 0 0 0 4 4
———————- ——– ——— ——– ———- ———-
1 vlan 0 0 0 4 4