Figure 62 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 63 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.
EX300 Platform
ECS EXSeries Hardware Guide 85
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