Cisco WS-C2960-24TT-L User Manual

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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
78-6511-08
Chapter 6 Configuring the System
Configuring STP
Configuring STP and UplinkFast in a Cascaded Cluster
STP uses default values that can be reduced when configuring Catalyst 2900 XL and Catalyst 3500 XL
switches in cascaded configurations. If an STP root switch is part of a cluster that is one switch from a
cascaded stack, you can customize STP to reconverge more quickly after a switch failure. Figure 6-7
shows modular Catalyst 2900 XL and Catalyst 3500 XL switches in three cascaded clusters that use the
GigaStack GBIC. Table 6-3 shows the default STP settings and those that are acceptable for these
configurations.
Figure 6-7 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 6-3 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 15 4 7 4
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

Cisco WS-C2960-24TT-L Specifications

General

Brand	Cisco
Model	WS-C2960-24TT-L
Category	Switch
Language	English