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88 CHAPTER 14: MSTP CONFIGURATION GUIDE
interface Ethernet1/0/8
stp disable
#
3 Configuration on Switch C
#
stp instance 0 priority 8192
stp enable
#
interface Ethernet1/0/1
stp root-protection
#
interface Ethernet1/0/2
stp root-protection
#
interface Ethernet1/0/3
stp root-protection
#
interface Ethernet1/0/8
stp disable
#
4 Configuration on Switch D
#
stp enable
#
interface Ethernet1/0/3
stp disable
interface Ethernet3/0/5
stp edged-port enable
stp bpdu-protection
#
Configuring Digest
Snooping and Rapid
Transition
Digest Snooping On a network comprised of devices of multiple vendors, 3Com switches cannot
interoperate with switches that run proprietary spanning tree protocols in the
same MSTP region, even if they are configured with the same MST region-related
settings.
To address the problem, you can enable digest snooping on the ports connected
to switches running proprietary spanning tree protocols.
Rapid Transition The proprietary spanning tree protocols of some vendors provide port state
transition mechanisms similar to RSTP. For a switch running such a proprietary
protocol, its rapid port state transition mechanism may fail on the designation port
when the switch is downlinked to an MSTP-enabled 3Com switch.
To address the problem, you can enable the rapid transition feature on the
downstream 3Com switch.