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HP Q.11.XX Manual Page 278

Procurve switches.
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Configuring and Monitoring Port Security
MAC Lockdown
PROBLEM: If this link fails,
traffic to Server A will not use
the backup path via Switch 3
Switch 3
Server A is locked down
to Switch 1, Uplink 2
Switch 1
M i x e d U s e r s
Figure 9-10. Connectivity Problems Using MAC Lockdown with Multiple Paths
The resultant connectivity issues would prevent you from locking down
Server A to Switch 1. And when you remove the MAC Lockdown from Switch
1 (to prevent broadcast storms or other connectivity issues), you then open
the network to security problems. The use of MAC Lockdown as shown in the
above figure would defeat the purpose of using STP or having an alternate
Technologies such as STP are primarily intended for an internal campus
network environment in which all users are trusted. STP does not work well
with MAC Lockdown.
If you deploy MAC Lockdown as shown in the Model Topology in figure 9-9
(page 9-22), you should have no problems with either security or connectivity.
Switch 4
Switch 2
Server A



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