Planning a Switched Network
2-28
893-878-B
You can also use feeder ports to make redundant connections between
independent switch communities (see
Figure 2-12. Using forced feeder ports for redundant switch community
connections
, two feeder ports from each virtual LAN (virtual LAN A and B)
of switches A and B are interconnected to enable redundancy between
independent switch communities. One port is automatically designated an
active feeder port, and the second port is designated a standby feeder port.
If the active feeder port fails, the port is partitioned and the standby feeder port
is enabled.
Using separate forced feeder links for each virtual LAN to carry traffic between
switches provides the following additional benefits:
•
Because the overall traffic is shared among the various links (on a
per-virtual LAN basis), the overall bandwidth between the switches is
greater than that available on a single link.
•
With LattisSpan trunks, the total number of MAC addresses for all of the
virtual LANs carried on the trunk is 1024. With per-virtual LAN links,
up to 1024 addresses per virtual LAN are supported (as long as the total
number of addresses in a community does not exceed 8192).
Virtual
LAN A
Virtual
LAN B
Model 58000 switch A
Switch community 1
Virtual
LAN B
Virtual
LAN A
Model 58000 switch B
Switch community 2
= Feeder port
= Standby feeder port
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