Dell PowerEdge FX2 Dell PowerEdge FN I/O Aggregator Configuration Guide 9.6(0 - Page 236
Virtual Link Trunking (VLT), Overview
View all Dell PowerEdge FX2 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 236 highlights
You can remove the tagged VLANs using the no vlan tagged vlan-range command. You can remove the untagged VLANs using the no vlan untagged command in the physical port/portchannel. 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. Overview VLT allows physical links between two chassis to appear as a single virtual link to the network core or other switches such as Edge, Access, or top-of-rack (ToR). VLT reduces the role of spanning tree protocols (STPs) by allowing link aggregation group (LAG) terminations on two separate distribution or core switches, and by supporting a loop-free topology. (To prevent the initial loop that may occur prior to VLT being established, use a spanning tree protocol. After VLT is established, you may use rapid spanning tree protocol (RSTP) to prevent loops from forming with new links that are incorrectly connected and outside the VLT domain.) VLT provides Layer 2 multipathing, creating redundancy through increased bandwidth, enabling multiple parallel paths between nodes and load-balancing traffic where alternative paths exist. Virtual link trunking offers the following benefits: • Allows a single device to use a LAG across two upstream devices. • Eliminates STP-blocked ports. 236 PMUX Mode of the IO Aggregator