Dell PowerEdge FX2 Dell PowerEdge FN I/O Aggregator Command Line Reference Gui - Page 454
Virtual Link Trunking (VLT), peer-ship to go down.
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Example Related Commands You can assign an interface to only one uplink-state group. Configure each interface assigned to an uplink-state group as either an upstream or downstream interface, but not both. You can assign individual member ports of a port channel to the group. An uplinkstate group can contain either the member ports of a port channel or the port channel itself, but not both. Dell(conf-uplink-state-group-16)# upstream tengigabitethernet 0/1-5 Dell(conf-uplink-state-group-16)# • downstream - assigns a port or port-channel to the uplink-state group as a downstream interface. • uplink-state-group - creates an uplink-state group and enables the tracking of upstream links. Virtual Link Trunking (VLT) VLT allows physical links between two chassis to appear as a single virtual link to the network core. VLT eliminates the requirement for Spanning Tree protocols by allowing link aggregation group (LAG) terminations on two separate distribution or core switches, and by supporting a loop-free topology. VLT provides Layer 2 multipathing, creating redundancy through increased bandwidth and enabling multiple parallel paths between nodes and load-balancing traffic where alternative paths exist. NOTE: When you launch the VLT link, the VLT peer-ship is not established if any of the following is TRUE: • The VLT System-MAC configured on both the VLT peers do not match. • The VLT Unit-Id configured on both the VLT peers are identical. • The VLT System-MAC or Unit-Id is configured only on one of the VLT peers. • The VLT domain ID is not the same on both peers. If the VLT peer-ship is already established, changing the System-MAC or Unit-Id does not cause VLT peer-ship to go down. Also, if the VLT peer-ship is already established and the VLT Unit-Id or System-MAC are configured on both peers, then changing the CLI configurations on the VLT Unit-Id or System-MAC is rejected if any of the following become TRUE: • After making the CLI configuration change, the VLT Unit-Id becomes identical on both peers. • After making the CLI configuration change, the VLT System-MAC do not match on both peers. When the VLT peer-ship is already established, you can remove the VLT Unit-Id or System-MAC configuration from either or both peers. However, removing configuration settings can cause the VLT ports to go down if you configure the Unit-Id or System-MAC on only one of the VLT peers. 454