Foundry NetIron M2404C and M2404F Metro Access Switches
Configuring RSTP (Rev. 03)
Rapid Spanning Tree Protocol (RSTP)
© 2008 Foundry Networks, Inc.
Page 30 of 34
2. Set the RSTP bridge priority to 4096, to make Switch A the Root Bridge:
SwitchA
(cfg protocol)#
rapid-spanning-tree priority 4096
3. Set the RSTP forwarding delay timer to 7. This calculation was done
according to the following formula
Forward_delay = ((4 x hello) + (3 x dia)) / 2
,
when the
hello-time
is 2 and the diameter is 2, according to
Figure 7
:
SwitchA
(cfg protocol)#
rapid-spanning-tree forward-delay 7
4. Set the RSTP Maximum aging time to 10. This calculation was done
according to the following formula
Max_age = (4 x hello) + (2 x dia) - 2
, when
the hello-time is 2 and the diameter, according to
Figure 7
:
SwitchA
(cfg protocol)#
rapid-spanning-tree max-age 10
Configuration of Switch B:
1. Enable Rapid Spanning Tree Protocol:
SwitchB
#
config terminal
SwitchB
(config)#
protocol
SwitchB
(cfg protocol)#
rapid-spanning-tree enable
Configuration of Switch C:
1. Enable Rapid Spanning Tree Protocol:
SwitchC
#
config terminal
SwitchC
(config)#
protocol
SwitchC
(cfg protocol)#
rapid-spanning-tree enable
SwitchC
(cfg protocol)#
exit
2. Set port 1/1/10 priority to 64 to cause it to be the forwarding port of Switch D:
SwitchC
(config)#
interface 1/1/10
SwitchC
(config-if 1/1/10)#
rapid-spanning-tree priority 64
Configuration of Switch D:
1. Enable Rapid Spanning Tree Protocol:
SwitchD
#
config terminal
SwitchD
(config)#
protocol
SwitchD
(cfg protocol)#
rapid-spanning-tree enable
SwitchD
(cfg protocol)#
exit
NOTE
After enabling RSTP on Switch D, all ports of this device will perform, by default,
as edge-ports.
2. Set port 1/1/1 with path cost 40000:
SwitchD
(config)#
interface 1/1/1
SwitchD
(config-if 1/1/1)#
rapid-spanning-tree path-cost 40000