Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 975

VLT and Stacking You cannot enable stacking on S4820T units with VLT. If you enable stacking on a unit on which you want to enable VLT, you must first remove the unit from the existing stack. For information about how to remove a unit from a stack, refer to Removing a Unit from an S-Series Stack. After you remove the unit, you can configure VLT on the unit. VLT and IGMP Snooping When configuring IGMP Snooping with VLT, ensure the configurations on both sides of the VLT trunk are identical to get the same behavior on both sides of the trunk. When you configure IGMP snooping on a VLT node, the dynamically learned groups and multicast router ports are automatically learned on the VLT peer node. VLT IPv6 VLT IPv6 is supported on the S4820T platform. The following features have been enhanced to support IPv6: • VLT Sync - Entries learned on the VLT interface are synced on both VLT peers. • Non-VLT Sync - Entries learned on non-VLT interfaces are synced on both VLT peers. • Tunneling - Control information is associated with tunnel traffic so that the appropriate VLT peer can mirror the ingress port as the VLT interface rather than pointing to the VLT peer's VLTi link. • Statistics and Counters - Statistical and counter information displays IPv6 information when applicable. • Heartbeat - You can configure an IPv4 or IPv6 address as a backup link destination. You cannot use an IPv4 and an IPv6 address simultaneously. VLT Port Delayed Restoration When a VLT node boots up, if the VLT ports have been previously saved in the start-up configuration, they are not immediately enabled. To ensure MAC and ARP entries from the VLT per node are downloaded to the newly enabled VLT node, the system allows time for the VLT ports on the new node to be enabled and begin receiving traffic. The delay-restore feature waits for all saved configurations to be applied, then starts a configurable timer. After the timer expires, the VLT ports are enabled one-by-one in a controlled manner. The delay between bringing up each VLT port-channel is proportional to the number of physical members in the port-channel. The default is 90 seconds. To change the duration of the configurable timer, use the delay-restore command. If you enable IGMP snooping, IGMP queries are also sent out on the VLT ports at this time allowing any receivers to respond to the queries and update the multicast table on the new node. This delay in bringing up the VLT ports also applies when the VLTi link recovers from a failure that caused the VLT ports on the secondary VLT peer node to be disabled. Virtual Link Trunking (VLT) 975