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1 Gigabit link
10/100 link
This VRRP + STP solution (as seen in figure 1) has served a large
number of enterprises very well for many years, but there are
some significant drawbacks to it:
Inefficient use of resources:
■
The VRRP standby router is greatly under-utilized while it is in
standby mode
■
STP puts many network links into a standby mode, so fails to
utilize a significant amount of available network bandwidth
Some network disruption in the case of failure:
■
Failover between the VRRP routers can take some seconds
■
STP can take some seconds to reconverge when an active link
fails
8600
8000S
VRRP
STP
SwitchBlade x908
8000S
Security concerns:
■
VRRP is vulnerable to malicious attacks, such as forcing a new
VRRP election
■
STP is vulnerable to many malicious attacks
Complexity of implementation and management:
■
A VRRP and STP solution requires substantial design
consideration and configuration to provide a reliable and
well functioning network
■
Problems in the operation of the spanning tree can be difficult to
track down as spanning trees are inherently complex, depending
on multiple negotiated agreements between switches throughout
the network
Servers
CORE
EDGE
Figure 1: VRRP + STP diagram
Allied Telesis Solutions: VCStack
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