6-27
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
78-6511-05
Chapter 6 Configuring the System
Configuring STP
Figure 6-5 Gigabit Ethernet Clusters
Enabling UplinkFast on all cluster switches can further reduce the time it takes
cluster switches to begin forwarding after a new root switch is selected.
Table 6-4 Default and Acceptable STP Parameter Settings (in Seconds)
STP Parameter
STP Default
(IEEE)
Acceptable
for Option 1
Acceptable
for Option 2
Acceptable
for Option 3
Hello Time2111
Max Age 20 6 10 6
Forwarding
delay
15474
Catalyst
2900 and
3500 XL
switches
33021
Catalyst
2900 and
3500 XL
switches
Catalyst
5000 series/
6000 backbone
Option 1:
standalone
cascaded
cluster
Option 2:
cascaded
cluster connected to
a Layer 2 backbone
Option 3:
cascaded
cluster connected to
a Layer 3 backbone
Catalyst 5000 series
switch
Catalyst 6000
switch
Layer 3
backbone
Cisco 7000
router
Catalyst 2900
and 3500 XL
switches
Cisco 7000
router
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