Configuring Spanning Tree For Use In A Cascaded Stack - Cisco Catalyst 3550 series Software Configuration Manual

Chapter 16 Configuring STP

Configuring Spanning Tree for Use in a Cascaded Stack

Spanning tree uses default values that can be reduced when configuring your switch in cascaded
configurations. If a root switch is part of a cluster that is one switch from a cascaded stack, you can
customize spanning tree to reconverge more quickly after a switch failure.
in three cascaded stacks that use the GigaStack GBIC.
settings and those that are acceptable for these configurations.
Table 16-5 Default and Acceptable Spanning-Tree Parameter Settings (in seconds)
STP Parameter STP Default
Hello Time 2
Max Age 20
Forwarding Delay 15
Figure 16-4 Gigabit Ethernet Stack
Catalyst 2950, 2955,
or 3550 switches
Option 1:
standalone
cascaded
cluster
78-11194-09
Acceptable for Option 1 Acceptable for Option 2
1
6
4
Catalyst
2950, 2955,
or 3550
switches
Option 2:
cascaded
cluster connected to
a Layer 2 backbone
Table 16-5
1
10
7
Catalyst 2950,
Catalyst 3550
2955, or 3550
series switch
switches
Catalyst
3550 or
6000 series
backbone
Catalyst 6000
switch
cluster connected to
a Layer 3 backbone
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Spanning-Tree Features
Figure 16-4 shows switches
shows the default spanning-tree
Acceptable for Option 3
1
6
4
Cisco 7000
router
Layer 3
backbone
Cisco 7000
router
Option 3:
cascaded
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