Selecting A Spanning-Tree Protocol; Table 17: Selecting A Spanning-Tree Protocol - Juniper EX9200 Features Manual

Spanning-Tree Protocols Feature Guide for EX9200 Switches

Selecting a Spanning-Tree Protocol

Table 17: Selecting a Spanning-Tree Protocol

Protocol Advantages
RSTP Rapid Spanning Tree Protocol is the default switch
configuration and is recommended for most network
configurations because it converges more quickly
than STP after a failure.
Voice and video work better with RSTP than they
do with STP.
RSTP is backward compatible with STP so switches
do not all have to run RSTP.
RSTP supports more ports than MSTP or VSTP.
STP Spanning Tree Protocol works with 802.1D 1998
bridges.
RSTP is backward compatible with STP so switches
do not all have to run STP.
160
On an EX Series switch running Junos OS that does not support ELS—VSTP can support
up to 253 VLANs.
NOTE: When you configure VSTP, we recommend that you enable VSTP on
all VLANs that can receive VSTP bridge protocol data units (BPDUs).
NOTE: When you configure VSTP with the
VLAN ID 1 is not set; it is excluded so that the configuration is compatible with
Cisco PVST+. If you want VLAN ID 1 to be included in the VSTP configuration
on your switch, you must set it separately with the
command.
NOTE: The
vlan all
switches.
NOTE: If your EX Series or QFX Series switch interoperates with a Cisco device
running Rapid per VLAN Spanning Tree (Rapid PVST+), we recommend that
you enable both VSTP and RSTP on the EX Series or QFX Series interface.
The default factory configuration for EX Series switches is RSTP, a faster version of STP.
To determine which spanning-tree protocol is best for your situation, see
Table 17 on page 160.
set protocol vstp vlan all
option is supported on all EX Series and QFX Series
Disadvantages
RSTP does not work with 802.1D 1998 bridges.
RSTP is not recommended for multiple VLAN
networks because it is not VLAN-aware—as a result,
all VLANs within a LAN share the same spanning
tree. This limits the number of forwarding paths for
data traffic.
STP is slower than RSTP.
STP is not recommended for multiple VLAN
networks because it is not VLAN-aware—as a result,
all VLANs within a LAN share the same
spanning-tree. This limits the number of forwarding
paths for data traffic.
Copyright © 2017, Juniper Networks, Inc.
command,
set protocol vstp vlan 1