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stp root secondary
Syntax
stp
[
instance instance-id
|
vlan
vlan-list
]
root secondary
undo stp
[
instance instance-id
|
vlan
vlan-list
]
root
View
System view
Default level
2: System level
Parameters
instance instance-id
: Configures the device as a secondary root bridge in a particular MSTI. The
value of
instance-id
ranges from 0 to 16, where 0 represents the CIST.
vlan vlan-list
: Specifies a VLAN list in the format of
vlan-list
= {
vlan-id
[
to
vlan-id
] }&<1-10>, where
the
vlan-id
argument represents the VLAN ID, in the range of 1 to 4094, and &<1-10>
indicates that
you can specify up to 10 VLAN IDs or VLAN ID ranges.
Description
Use
stp root secondary
to configure the device as a secondary root bridge.
Use
undo stp root
to restore the default.
By default, a device is not a secondary root bridge.
To set an MSTP device as a secondary root bridge in a specific MSTI, use this command with the
MSTI specified. To set a PVST device as a secondary root bridge in a specific VLAN or multiple
VLANs, use this command with a VLAN list specified. To set an MSTP device in the CIST or an
STP/RSTP device as a secondary root bridge, use this command without specifying any MSTI and
VLAN.
Once you specify the device as a secondary root bridge, you cannot change the priority of the
device.
Related commands:
stp priority
and
stp root primary
.
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 mode pvst
[Sysname] stp vlan 1 root secondary
stp root-protection
Syntax
stp root-protection
undo stp
root-protection
View
Ethernet interface view, port group view, Layer 2 aggregate interface view