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Backup Links
How Backup Links Work
Backup Links
Limitations
■ Each hub can monitor a single backup link (only one backup link can be
configured on each hub). But, the hub may be at the remote end of one
backup link and at the monitoring end of a backup link to a different hub.
■ A given hub should be connected to the remote end of no more than two
backup links. If it is functioning as the remote hub in more than two
backup links, it may not be able to respond to the test packets fast enough
when there is a high level of data traffic on the network.
This ability to respond may be improved by increasing the time between
test packet transmissions on the monitoring hubs. For all the backup links
in which the remote hub is involved, the time configured on the moni-
toring hubs for those links should be increased by one second for each
additional backup link beyond two links. Add one to this count if the
remote hub is also functioning as a primary (monitoring) hub in a different
link.
Additional Notes
■ Any port on the hub can be used for either the primary link or the backup
link.
■ Any combination of media types can be used as a backup link by using
the AUI port. This accepts fiber, thin coax, and twisted pair external
transceivers.
■ The primary link and the backup link cabling should be run over different
paths (through different conduits, for example) to reduce the possibility
that damage will occur to both cables simultaneously.
MUCHO.BK : CE.FM5 Page 2 Thursday, June 26, 1997 11:37 AM