If the interface cost is configured under MSTP, this becomes the default value for all
interfaces. If the interface cost is configured under the MSTI interface, the value overrides
the default for that interface.
If the interface cost is configured at both the VSTP global and VLAN levels, the
configuration at the VLAN level overrides the global configuration.
The interface cost should be set the same for all interfaces connected to the same LAN
segment.
Related
Documentation
Configuring Rapid Spanning Tree Protocol•
• Configuring Multiple Spanning Tree Protocol
• Configuring VLAN Spanning Tree Protocol
• cost
• interface (Spanning Tree)
Spanning-Tree Instance Interface Point-to-Point Link Mode
The interface mode allows RSTP, MSTP, and VSTP to converge faster than the original
STP on point-to-point links. The protocol does not need to wait for timers on
point-to-point links. Configure interfaces that have a point-to-point link to another Layer 2
bridge as p2p. This parameter is ignored if the STP is configured to run the original
spanning-tree version.
If the interface mode is configured at both the VSTP global and VLAN levels, the
configuration at the VLAN level overrides the global configuration.
Related
Documentation
Configuring Rapid Spanning Tree Protocol•
• Configuring Multiple Spanning Tree Protocol
• Configuring VLAN Spanning Tree Protocol
• mode
• interface (Spanning Tree)
Configuring a Spanning-Tree Instance Interface as an Edge Port for Faster Convergence
RSTP, MSTP, and VSTP instance interfaces configured as edge ports enable the protocol
to converge faster than the original IEEE 802.1D STP version. Edge ports transition directly
to the forwarding state, and so the protocol does not need to wait for BPDUs to be
received on edge ports.
The Junos OS supports automatic detection of edge ports as described in the RSTP
standard. Layer 2 bridges do not expect to receive BPDUs for edge ports. If a BPDU is
received for an edge port, the port becomes a non-edge port.
409Copyright © 2017, Juniper Networks, Inc.
Chapter 12: Configuring Layer 2 Control Protocol
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