M A G N U M 6 K S W I T C H E S , M N S - 6 K U S E R G U I D E3. There can be multiple S-Rings on a given Magnum 6K switch. There can bemultiple ring topologies in a network. Each ring has to be a separate ring. Ringof rings or overlapping rings are not supported at this time4. S-Ring topologies support one failure in the network. A second failure maycreate isolated network islands5. At least one untagged VLAN must be available for the BPDU’s to propagatethrough the network to update RSTP/STP status6. S-Ring faults can be software signaled to alarm contacts.Comparing resiliency methodsSo far we have briefly covered S-Ring with LLL, RSPT as well as STP. The table belowsummarizes some decision criteria on selecting RSPT vs STP vs S-Ring (and LLL.)S-Ring with LLL RSTP STPLicense A license key is needed. One keyper ring manager switchIncluded in MNS-6KIncluded in MNS-6KSpanning Tree Works with RSTP or STP devices -- --DevicessupportedManaged or certain non managedMagnum switches. Requires at leastone Magnum 6K switch as ringmanagerMany ManyRecoverydecisionCentralized to “Ring Manager”.LLL provides triggers torecomputed topology for ringmembers. Also works with RSTPor STP.Typically doneusing BPDU. Cantake time.Typically doneusing BPDU. Cantake time.Topology Single ring, multiple rings, nooverlapping rings or ring of ringsMesh topology –can have multiplepathsMesh topology –can have multiplepathsInteroperability Works with managed 6K family ofswitches, other managed switchessuch as mP62 and non managedswitches as well as some hubsWide range ofproducts,including othervendor productsWider range ofproducts,including othervendor productsRecovery time Fast Medium – subsecond to a fewsecondsSlow – in tens ofseconds176
