Peer-Routing-Timeout timer : 0 seconds
Multicast peer-routing timeout : 150 seconds
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 Uptime Ports
L 2 L2L3 up 03:43:24 Te 1/4 (Up)
Dell-4#show interfaces port-channel 2 brief
Codes: L - LACP Port-channel
LAG Mode Status Uptime Ports
L 2 L2L3 up 03:33:31 Te 1/18 (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
Virtual Link Trunking (VLT) 1142
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