Figure 31 Ring topology
The ring topology is very similar to the daisy chain/line topology, except that it is more robust
since it requires two points of failure to break the topology which would cause a split-brain issue.
The inter-rack ring topology between EX-Series racks are shown in the following figure.
Figure 32 Inter-rack switch connectivity - ring topology
Star topology
The limitation with the daisy chain or ring topologies is that they do not scale well for large
installations. For ten or more ECS racks, one or two aggregation switches should be added support
the large installation. For high availability, the recommended topology is to use two aggregation
switches with port channel (VLT, vPC, MLAG) connectivity between them. If you use a single
aggregation switch, both the Fox switch (BE1) and the Hound switch (BE2) are connected to the
single switch. The impact of using only one aggregation switch is the loss of high availability for
the aggregation switch. For connectivity to aggregation switches, use the inbound port 41 on each
back-end switch to link to the aggregation switch(es).
By using aggregation switch(es) to connect to all the intra-rack networks, the star topology
provides better protection against the split-brain issue than both the daisy chain/linear or ring
topologies. With aggregation switch(es), link failures are isolated to a single intra-rack network in
the private.4 network.
EX500 Platform
52
ECS EXSeries Hardware Guide
Summary of Contents for ECS EX Series
Page 1: ...ECS EXSeries Version 3 4 Hardware Guide 08 February 2020 ...
Page 8: ...Tables 8 ECS EXSeries Hardware Guide ...
Page 10: ...Welcome to ECS 10 ECS EXSeries Hardware Guide ...
Page 15: ...CHAPTER 2 Switches l Dell EMC S5148F switch 16 ECS EXSeries Hardware Guide 15 ...
Page 39: ...EX500 Platform ECS EXSeries Hardware Guide 39 ...
Page 42: ...Figure 19 iDRAC cabling EX500 Platform 42 ECS EXSeries Hardware Guide ...
Page 49: ...Figure 26 EX500 network cabling EX500 Platform ECS EXSeries Hardware Guide 49 ...
Page 54: ...EX500 Platform 54 ECS EXSeries Hardware Guide ...
Page 69: ...Figure 43 EX300 single phase AC power cabling EX300 Platform ECS EXSeries Hardware Guide 69 ...
Page 71: ...Figure 45 Three phase Delta AC power cabling EX300 Platform ECS EXSeries Hardware Guide 71 ...
Page 73: ...Figure 47 Three phase WYE AC power cabling EX300 Platform ECS EXSeries Hardware Guide 73 ...
Page 76: ...Figure 50 iDRAC cabling EX300 Platform 76 ECS EXSeries Hardware Guide ...
Page 82: ...Figure 57 EX300 network cabling EX300 Platform 82 ECS EXSeries Hardware Guide ...
Page 114: ...Figure 86 EX3000D iDRAC cabling EX3000 Platform 114 ECS EXSeries Hardware Guide ...
Page 121: ...Figure 94 EX3000S network cabling EX3000 Platform ECS EXSeries Hardware Guide 121 ...
Page 122: ...Figure 95 EX3000D network cabling EX3000 Platform 122 ECS EXSeries Hardware Guide ...
Page 124: ...EX3000 Platform 124 ECS EXSeries Hardware Guide ...