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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

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