3Com 4210, 5500G, 4200G manual # Enable rapid transition on the root port Ethernet 1/0/1

90CHAPTER 14: MSTP CONFIGURATION GUIDE

[3Com] interface Ethernet 1/0/1

[3Com-Ethernet1/0/1] stp config-digest-snooping

# Enable rapid transition on the root port Ethernet 1/0/1.

[3Com-Ethernet1/0/1] stp no-agreement-check

[3Com-Ethernet1/0/1] quit

2Configuration on Switch C

# Enable MSTP.

<3Com> system-view

[3Com] stp enable

# Set the priority of Switch C to 8192.

[3Com] stp priority 8192

# Enable digest snooping on Switch C.

[3Com] stp config-digest-snooping

# Enable digest snooping on the root port Ethernet 1/0/2.

[3Com] interface Ethernet 1/0/2

[3Com-Ethernet1/0/2] stp config-digest-snooping

[3Com-Ethernet1/0/2] quit

# Enable rapid transition on Ethernet 1/0/1.

[3Com] interface Ethernet 1/0/1

[3Com-Ethernet1/0/1] stp no-agreement-check

[3Com-Ethernet1/0/1] quit

n	■	The rapid transition feature can be enabled only on root ports or alternate
		ports.
	■	You can enable rapid transition on a designated port, but the configuration
		cannot take effect on the port.

Complete Configuration

1Configuration on Switch B

#

stp enable

stp instance 0 priority 4096 stp config-digest-snooping

#

interface Ethernet1/0/1 stp config-digest-snooping stp no-agreement-check

#

2Configuration on Switch C

#

stp enable

stp instance 0 priority 8192