Madge Networks Token Ring Switch - Manual (Page 52)

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Smart DeskStream Technical Presentation 52
n CRF is operational on all ports in stack by default
n CRF will attempt to learn ring number
n the CRF ring number can be manually configured
Source Route Switching
Combining CRF and BRF functions
CRF
BRF
n BRF will only function on master DeskStream
n only ports on master DeskStream are supported on BRF
n Each port can be designated as a BRF port, including option
module ports
n Each BRF port has its own ring number
n BRF ports can auto-detect ring number
n Internal “virtual” port links between the CRF and BRF
Summary
CRF will attempt to learn the ring number from the RIF in passing
frames as will the BRF.