User`s guide

50 • Chassis and Blade Installation R Series Data Center Products User’s Guide, Rev. B
Mixed-Mode Chassis Cabling
Mixed-mode cabling is the attachment of R4300-equipped chassis to chassis with
Blade Switching BackPacks (BSBPs) or Direct Connect BackPacks (DCBPs). The
recommended practice is to use one or more R4300s for Primary and auto-negotiated
control. One or more RMMs need to be connected to Ethernet to allow
auto-negotiation and control failover. Figure 24 shows an example of this.
NOTE: With an RMC-equipped BSBP as Primary, no other chassis in the Control
Chain can serve as Secondary, because Secondary mode is not supported
on the RMC.
Figure 24 Mixed-Mode Daisy-Chain Cabling Example
Admin C/Port
CLEARCU BE
Spare
Primary R4300
To Network
Secondary R4300
Tertiary BSBP R4200
with E-net Control Link
Admin
Daisy Chain
Control
Chain
Configuration
Cable
To Network
with E-net Control Link
No RMC
Spare
Daisy Chain
Admin
Daisy Chain
No E-net Control Link
Admin C/Port
and Terminal