Dell X1000 Series User Manual page 191

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Rapid Spanning Tree
While classic spanning tree prevents Layer 2 forwarding loops on a general
network topology, convergence can take from 30 to 60 seconds. This delay
provides time to detect possible loops, and propagate status changes.
Rapid Spanning Tree Protocol (RSTP) detects and uses network topologies
that enable a faster convergence of the spanning tree, without creating
forwarding loops.
To configure RSTP:
1 Click Network Administration > Spanning Tree and LAG > Spanning
Tree > Rapid Spanning Tree.
2 Select either Ports or LAGs from the View By dropdown menu.
3 Click Edit, select an interface, click its Edit icon and enter the fields:
Interface — Displays the port or LAG selected.
–
– State — Displays the RSTP state of the selected interface.
– Role — Displays the port role assigned by the STP algorithm in order
to provide STP paths. The possible options are:
• Root — This port provides the lowest cost path to forward packets
to root bridge.
• Designated — This port is the interface through which the bridge
is connected to the LAN, which provides the lowest cost path
from the LAN to the Root Bridge.
• Alternate — This port provides an alternate path to the root
bridge from the root port.
• Backup — This port provides a backup path to the designated
port. Backup ports occur only when two ports are connected in a
loop by a point-to-point link. Backup ports also occur when a LAN
has two or more connections connected to a shared segment.
• Disabled — This port is not participating in the Spanning Tree.
– Mode — Displays if RSTP is enabled.
– Fast Link Operational Status — Displays if Fast Link is enabled or
disabled for the port or LAG. If Fast Link is enabled for an interface,
the interface is automatically placed in the forwarding state. The
possible options are:
D E L L C O N F I D E N T I A L – P R E L I M I N A R Y 8 / 9 / 1 6 - F O R P R O O F O N L Y
Guide\Dell_Astute_Network_Admin_STP.fm
Network Administration: Spanning Tree and LAG
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