Dell PowerStore 1200T EMC PowerStore Networking Guide for PowerStore T Models - Page 48

Direct interconnect using Multi-chassis Link Aggregation (MC-LAG)

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Direct interconnect using Multi-chassis Link Aggregation (MCLAG) It is highly recommended that you deploy PowerStore with an MC-LAG interconnect between the two ToR switches. MC-LAG is a switch interconnection technology that joins a number of independent Top-of-Rack (ToR) switches into a single virtual chassis. MC-LAG allows the link aggregation (LAG) port groups to span multiple chassis, enabling better resilience of the LAG connection. Additionally, MC-LAG enables traffic going from switch to switch using the full bandwidth of the available connection, without using spanning tree protocol (STP), which would disable some links to prevent loops. MC-LAG is a general name for the technology, however certain vendors use their own proprietary terminology to define MC-LAG connectivity. Table 20. Vendor specific MC-LAG technology Vendor Proprietary MC-LAG technology Dell Virtual Link Trunking (VLT) Cisco Virtual PortChannel (vPC) Brocade Multi-Chassis Trunking (MCT) NOTE: Refer to your vendor's documentation to determine their technology for MC-LAG. When the ToR switches are interconnected with MC-LAG the two ports used on PowerStore appliance 4-port card, or I/O module (system bond) are able to be configured in an active/active state. PowerStore Network Topology with Top of Rack Switches and MC-LAG Interconnect Top of Rack Switch 1 MC-LAG Interconnect Top of Rack Switch 2 Port X Port Y Node A Port Channels Port Y Port X Node B PowerStore T Appliance Figure 10. ToR switches with MC-LAG interconnect For MC-LAG connectivity it is recommended that: ● A minimum of two connection cables in parallel with a high speed reliable connection. ● Use of high speed ports will reduce the network traffic congestion between the two switches. ● Verify best practices for MC-LAG from your switch provider documentation. 48 Switch requirements for deployments with storage services

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Direct interconnect using Multi-chassis Link Aggregation (MC-
LAG)
It is highly recommended that you deploy PowerStore with an MC-LAG interconnect between the two ToR switches.
MC-LAG is a switch interconnection technology that joins a number of independent Top-of-Rack (ToR) switches into a single
virtual chassis. MC-LAG allows the link aggregation (LAG) port groups to span multiple chassis, enabling better resilience of
the LAG connection. Additionally, MC-LAG enables traffic going from switch to switch using the full bandwidth of the available
connection, without using spanning tree protocol (STP), which would disable some links to prevent loops.
MC-LAG is a general name for the technology, however certain vendors use their own proprietary terminology to define
MC-LAG connectivity.
Table 20. Vendor specific MC-LAG technology
Vendor
Proprietary MC-LAG technology
Dell
Virtual Link Trunking (VLT)
Cisco
Virtual PortChannel (vPC)
Brocade
Multi-Chassis Trunking (MCT)
NOTE:
Refer to your vendor's documentation to determine their technology for MC-LAG.
When the ToR switches are interconnected with MC-LAG the two ports used on PowerStore appliance 4-port card, or I/O
module (system bond) are able to be configured in an active/active state.
Node B
Node A
Top of Rack
Switch 2
Top of Rack
Switch 1
Port X
Port Y
Port Y
Port X
PowerStore T Appliance
MC-LAG
Interconnect
PowerStore Network Topology with
Top of Rack Switches and MC-LAG
Interconnect
Port Channels
Figure 10. ToR switches with MC-LAG interconnect
For MC-LAG connectivity it is recommended that:
●
A minimum of two connection cables in parallel with a high speed reliable connection.
●
Use of high speed ports will reduce the network traffic congestion between the two switches.
●
Verify best practices for MC-LAG from your switch provider documentation.
48
Switch requirements for deployments with storage services