— Exhibit —
[edit protocols vstp]
‘vlan all’
Cannot configure VSTP on all VLANs when more than 253 VLANs are configured. Configure vstp
vlan-group along with STP or RSTP to cover all VLANs
[edit protocols]
‘vstp’
Failed to configure vstp on all vlans
error: configuration check-out failed
— Exhibit —
Click the Exhibit button.
What are two reasons for the commit error shown in the exhibit? (Choose two.)
A.
The set protocols vstp vlan all configuration is not supported.
B.
There are more than 253 VLANs configured on the switch.
C.
MSTP is not configured with VSTP.
D.
STP or RSTP is not configured along with VSTP on the switch.
The answer is A&B.
[EX] Example configuration with two Spanning Tree Protocols (STP) in a single switch
http://kb.juniper.net/KB18259
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i think B and D are correct
read here for answer D
http://www.juniper.net/techpubs/en_US/junos14.1/topics/task/configuration/spanning-trees-vstp-ex-series-cli.html
set protocols vstp vlan all is supported
“Note: EX Series switches can have a maximum of 253 VLANs on VSTP. RSTP will then be applied to VLANs that exceed the limit for VSTP. Be sure that RSTP is also enabled (the default setting) when you use the command set vstp vlan all. In addition to this being a recommended practice, your configuration will not commit if VSTP is enabled on a switch with more than 253 VLANs.”
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When you configure VSTP with the set protocol vstp vlan all command, 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 set protocol vstp vlan 1 command.
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