Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 1015
PVST+ Configuration, PVST+ Instances
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no shutdown s60-1#show interfaces port-channel 100 brief Codes: L - LACP Port-channel LAG Mode Status Uptime Ports L 100 L2 up 03:33:48 Te 1/8 (Up) Te 1/30 (Up) Verify VLT is up. Verify that the VLTi (ICL) link, backup link connectivity (heartbeat status), and VLT peer link (peer chassis) are all up. DellEMC#show vlt br VLT Domain Brief Domain ID 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 DellEMC# Verify that the VLT LAG is up in VLT peer unit. : 1 : 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 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 EMC 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. Virtual Link Trunking (VLT) 1015
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