User's Manual

Installing and Setting Up the CMC 39
chassis are connected in series and only one is connected to the management
network. The basic connection type uses more ports on the management
network and provides greater redundancy. The daisy-chain connection type
uses fewer ports on the management network but introduces dependencies
between CMCs, reducing the redundancy of the system.
Basic CMC Network Connection
For the highest degree of redundancy, connect each CMC to your
management network. If a chassis has just one CMC, make one connection
on the management network. If the chassis has a redundant CMC in the
secondary CMC slot, make two connections to the management network.
Each CMC has two RJ-45 Ethernet ports, labeled "GB1" and "GB2". With
basic cabling, you connect the GB1 port to the management network and
leave the GB2 port unused.
Daisy-chain CMC Network Connection
If you have multiple chassis in a rack, you can reduce the number of
connections to the management network by daisy-chaining up to four chassis
together. If each of four chassis contains a redundant CMC, by daisy-chaining
you reduce the number of management network connections required from
eight to two. If each chassis has only one CMC, you reduce the connections
required from four to one.
When daisy-chaining chassis together, GB1 is the "uplink" port and GB2 is
the "stacking" port. A GB1 port must connect to the management network or
to the GB2 port of the CMC in a chassis that is closer to network. The GB2
port must only receive a connection from a GB1 port further from the chain.
Create separate chains for the CMCs in the primary CMC slot and the
second CMC slot.
Figure 2-1 illustrates the arrangement of cables for four daisy-chained chassis,
each with CMCs in the primary and secondary slots.