Cisco CAB-GS-50CM Manual De Usuario

Point−to−point connections consist of one GigaStack GBIC per switch and only one connection exists
between these modules. The additional available port on the Gigastack is not used and should not be
connected to any other device. In this configuration, the GigaStack interface will automatically negotiate to
full−duplex. One switch can have multiple point−to−point connections with neighbors as long as you are only
using one per port on separate GigaStacks to neighboring switches.

In point−to−point operations, it does not matter what port is connected to the neighbor's port. For example,
GigaStack port 1 on switch A can be connected to GigaStack port 2 on switch B.

Cascaded stack configurations consist of one GigaStack GBIC per switch. Multiple connections exist between
these modules. By using one module per switch, you are able to interconnect between three and nine switches
using only one GigaStack module per switch. The cable is daisy chained between switches by connecting
opposite port numbers between switches. Port 1 to neighboring switch port 2 and so on. There is no physical
redundancy.

In this configuration, all GigaStack interfaces will automatically negotiate to half−duplex. All GigaStack ports
will act as a repeater and share the one Gbps channel. The shared Gigabit connection between all switches is
called a multidrop backbone.

Cisco − Catalyst Switch GigaStack Configuration and Implications