Pvst+ Configuration; Sample Pvst+ Configuration - Dell S3048-ON Configuration Manual

Role
Role Priority
ICL Link Status
HeartBeat Status
VLT Peer Status
Version
Local System MAC address
Remote System MAC address
Remote system version
Delay-Restore timer
Delay-Restore Abort Threshold
Peer-Routing
Peer-Routing-Timeout timer
Multicast peer-routing timeout
Dell#
Verify that the VLT LAG is up in VLT peer unit.
Dell-2#show interfaces port-channel 2 brief
Codes: L - LACP Port-channel
LAG Mode Status
L 2 L2L3 up
Dell-4#show interfaces port-channel 2 brief
Codes: L - LACP Port-channel
LAG Mode Status
L 2 L2L3 up

PVST+ Configuration

PVST+ is supported in a VLT domain.
Before you configure VLT on peer switches, configure PVST+ in the network. PVST+ is required for initial loop prevention during the VLT
startup phase. You may also use PVST+ for loop prevention in the network outside of the VLT port channel.
Run PVST+ on both VLT peer switches. A PVST+ instance is created for every VLAN configured in the system. PVST+ instances running in
the Primary Peer control the VLT-LAGs on both Primary and Secondary peers. Only the Primary VLT switch determines the PVST+ roles
and states on VLT ports and ensures that the VLT interconnect link is never blocked. The PVST+ instance in Primary peer sends the role/
state of VLT-LAGs for all VLANs to the Secondary peer. The Secondary peer uses this information to program the hardware. The PVST+
instance running in Secondary peer does not control the VLT-LAGs.
Dell Networking recommends configuring the primary VLT peer as the primary root device for all the configured PVST+ Instances and
configuring the secondary VLT peer as the secondary root device for all the configured PVST+ Instances.

Sample PVST+ Configuration

The following examples show the PVST+ configuration that you must perform on each peer switch to prevent forwarding loops.
Configure PVST+ on VLT Peers to Prevent Forwarding Loops (VLT Peer 1)
Dell_VLTpeer1(conf)#protocol spanning-tree pvst
Dell_VLTpeer1(conf-pvst)#no disable
Dell_VLTpeer1(conf-pvst)#vlan 1000 bridge-priority 0
Configure PVST+ on VLT Peers to Prevent Forwarding Loops (VLT Peer 2)
Dell_VLTpeer2(conf)#protocol spanning-tree pvst
Dell_VLTpeer2(conf-pvst)#no disable
Dell_VLTpeer2(conf-pvst)#vlan 1000 bridge-priority 4096
908 Virtual Link Trunking (VLT)
Uptime Ports
03:43:24 Gi 1/4 (Up)
Uptime Ports
03:33:31 Gi 1/18 (Up)
: Secondary
: 32768
: Up
: Up
: Up
: 6(3)
: 00:01:e8:8a:e9:91
: 00:01:e8:8a:e9:76
: 6(3)
: 90 seconds
: 60 seconds
: Disabled
: 0 seconds
: 150 seconds