Table of Contents
Advertisement
Parameters
instance instance-list: Specifies a space-separated list of up to 10 MSTI items. Each item specifies
an MSTI or a range of MSTIs in the form of instance-id1 [ to instance-id2 ]. The value for instance-id2
must be equal to or greater than the value for instance-id1. The value range for the instance-id
argument is 0 to 4094, and the value 0 represents the CIST.
vlan vlan-id-list: Specifies a space-separated list of up to 10 VLAN items. Each item specifies a
VLAN or a range of VLANs in the form of vlan-id1 [ to vlan-id2 ]. The value for vlan-id2 must be equal
to or greater than the value for vlan-id1. The value range for the vlan-id argument is 1 to 4094.
Usage guidelines
Once you specify the device as a secondary root bridge, you cannot change the priority of the
device.
If you do not specify an MSTI or VLAN, this command configures a secondary root bridge for the
MSTP CIST or of the STP or RSTP spanning tree.
Examples
# In MSTP mode, specify the device as a secondary root bridge in MSTI 1.
<Sysname> system-view
[Sysname] stp instance 1 root secondary
# In PVST mode, specify the device as a secondary root bridge in VLAN 1.
<Sysname> system-view
[Sysname] stp vlan 1 root secondary
Related commands
•
stp priority
•
stp root primary
stp root-protection
Use stp root-protection to enable root guard on a port.
Use undo stp root-protection to disable root guard on a port.
Syntax
stp root-protection
undo stp root-protection
Default
Root guard is disabled.
Views
Layer 2 Ethernet interface view, Layer 2 aggregate interface view
Predefined user roles
network-admin
Usage guidelines
On a port, the loop guard feature and the root guard feature are mutually exclusive.
When the setting is configured in Layer 2 Ethernet interface view, it takes effect only on that
interface.
When the setting is configured in Layer 2 aggregate interface view, it takes effect only on the
aggregate interface.
149
Advertisement
Table of Contents
