Model 58000 Switch Operation
893-878-B
2-19
Feeder Mode
When switch ports are configured to operate in feeder mode, the switch uses
the LattisSpan forced feeder detection process to configure ports automatically
as active feeder ports or standby feeder ports. This process enables the switch
to select, per community, one active feeder among ports of the same virtual
LAN that are connected to the same Ethernet segment. The active feeder port
learns the MAC addresses of the devices communicating on the segment and
carries network traffic.
Additional feeder ports in the same community that are connected to the same
Ethernet segment where an active feeder port is connected are designated
standby feeder ports. Standby feeder ports do not learn MAC addresses of the
devices on the segment. A standby feeder port takes over communications upon
the failure of an active feeder port within a 10-second time frame. This
configuration allows port-level and switch-level redundancy within single or
multiple switch communities (see
Redundant Feeder Link Configurations
in this section for example redundant switch connection configurations).
Feeder Port Priority Assignment
The LattisSpan forced feeder detection process enables the switch to select
active feeder ports based on prioritized attributes. Decisions are made in the
following order:
•
Master switch priority values are examined—the switch with the lower
master switch priority value has the higher priority.
•
Master switch MAC addresses are examined—the master switch with the
lower MAC address has the higher priority.
•
Switch MAC addresses are examined—the switch with the lower MAC
address has the higher priority.
•
Port IDs (switch MAC address and port number) are examined—the port
with the lowest number on the switch with the lower MAC address has the
highest priority.
This switch algorithm applies to each port that is connected to a common
Ethernet segment and determines which port is the active feeder port. When
making connections to a common Ethernet segment, all ports connecting to the
segment should be configured to operate in feeder mode.
893-878-B Book Page 19 Monday, May 12, 1997 2:06 PM
Summary of Contents for 58000
Page 4: ...iv 893 878 B 893 878 B Book Page iv Monday May 12 1997 2 06 PM ...
Page 12: ...xii 893 878 B 893 878 B Book Page xii Monday May 12 1997 2 06 PM ...
Page 14: ...xiv 893 878 B 893 878 B Book Page xiv Monday May 12 1997 2 06 PM ...
Page 22: ...893 878 B Book Page xxii Monday May 12 1997 2 06 PM ...
Page 38: ...893 878 B Book Page 16 Monday May 12 1997 2 06 PM ...
Page 90: ...893 878 B Book Page 4 Monday May 12 1997 2 06 PM ...
Page 100: ...893 878 B Book Page 10 Monday May 12 1997 2 06 PM ...
Page 106: ...893 878 B Book Page 6 Monday May 12 1997 2 06 PM ...
Page 144: ...893 878 B Book Page 38 Monday May 12 1997 2 06 PM ...
Page 152: ...893 878 B Book Page 4 Monday May 12 1997 2 06 PM ...