Understanding Vstp For Ex Series Switches - Juniper JUNOS OS 10.3 - SOFTWARE Manual

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Understanding VSTP for EX Series Switches

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Copyright © 2010, Juniper Networks, Inc.
Example: Configuring Root Protection to Enforce Root Bridge Placement in Spanning
Trees on EX Series Switches on page 1573
Example: Configuring Loop Protection to Prevent Interfaces from Transitioning from
Blocking to Forwarding in a Spanning Tree on EX Series Switches on page 1569
Example: Configuring BPDU Protection on STP Interfaces to Prevent STP
Miscalculations on EX Series Switches on page 1561
Example: Configuring BPDU Protection on non-STP Interfaces to Prevent STP
Miscalculations on EX Series Switches on page 1565
Understanding MSTP for EX Series Switches on page 1521
Understanding RSTP for EX Series Switches on page 1520
Understanding STP for EX Series Switches on page 1519
Understanding VSTP for EX Series Switches on page 1525
VLAN Spanning Tree Protocol (VSTP) allows Juniper Networks EX Series Ethernet
Switches to run one or more Spanning Tree Protocol (STP) or Rapid Spanning Tree
Protocol (RSTP) instances for each VLAN on which VSTP is enabled. For networks with
multiple VLANs, VSTP improves intelligent tree spanning by defining best paths within
the VLANs instead of within the entire network.
You can configure VSTP for a maximum of 253 VLANs. If you need to run a spanning-tree
protocol on more than 253 VLANs, you must configure VSTP and RSTP concurrently.
When VSTP and RSTP are configured, up to 253 VLANs can use VSTP and the remaining
VLANs use RSTP. You can selectively configure which VLANs use VSTP when VSTP and
RSTP are configured.
VSTP and RSTP are the only spanning-tree protocols that can be configured concurrently
on the switch.
NOTE: We recommend that you enable VSTP on all VLANs that could receive
VSTP bridge protocol data units (BPDUs).
Understanding STP for EX Series Switches on page 1519
Understanding RSTP for EX Series Switches on page 1520
Understanding Layer 2 Protocol Tunneling on EX Series Switches on page 1299
Configuring VLAN Spanning Tree Protocol (CLI Procedure) on page 1584
Chapter 64: Spanning-Tree Protocols—Overview
1525