Resilience - 3Com OfficeConnect 3C16710 User Manual

16710.bk : MANAGING.FRM Page 33 Tuesday, October 7, 1997 11:38 AM

Resilience

You can make your network more robust by adding
resilience to it.
When a link fails, as shown in Figure 4-14 , all
communication between equipment on each side of
the link is lost. It would be very inconvenient for a
manager to physically reinstate the network
immediately and important communication might
be lost.
Figure 4-14 A Failed Link Between Two Hubs
If a spare link could automatically pick up when the
broken link failed, the network would appear to
function normally to the user. At worst, a few packets
would be corrupted or lost.
This is the concept of resilience. One link is on
standby (called the standby link) waiting to take over
if another link (called the main link) fails, as shown in
Figure 4-15 . This pair is called a resilient link pair .
Figure 4-15 A Resilient Link Pair
Resilience 4-33