Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1970

Complete Software Guide for Junos
vstp
Syntax
Hierarchy Level
Release Information
Description
1866
®
OS for EX Series Ethernet Switches, Release 10.4
vstp {
bpdu-block-on-edge;
disable;
force-version stp;
vlan (vlan-id | vlan-name) {
bridge-priority priority;
forward-delay seconds;
hello-time seconds;
interface (all | interface-name) {
disable;
bpdu-timeout-action{
block;
log;
}
cost cost;
edge;
mode mode;
no-root-port;
priority priority;
}
max-age seconds;
traceoptions {
file filename <files number > <size size> <no-stamp | no-world-readable |
world-readable>;
flag flag;
}
}
}
[edit protocols]
Statement introduced in Junos OS Release 9.4 for EX Series switches.
Configure VLAN Spanning Tree Protocol (VSTP). VSTP is used to prevent loops in Layer
2 networks on a per-VLAN basis.
You cannot commit a configuration that uses VSTP on more than 253 VLANs. If there
are more than 253 VLANs on your switch, you must use the
which VLANs or VLAN groups should use VSTP, and the total number of VLANs using
VSTP cannot exceed 253. You also cannot use the
when your switch has more than 253 VLANs. Run RSTP with VSTP in networks with large
numbers of VLANs to ensure all VLANs are running a spanning-tree protocol.
BEST PRACTICE: Configure RSTP when you configure VSTP. RSTP overhead
is minimal and this configuration ensures that a spanning-tree protocol is
running on all VLANs on your switch, even when your switch is supporting
more than 253 VLANs.
vlan statement to specify
option to configure VSTP
vlan all
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