1-19z When the digest snooping feature is enabled on a port, the port turns to the discarding state. That is,the port stops sending BPDU packets. The port is not involved in the STP calculation until itreceives BPDU packets from the peer port.z The digest snooping feature is needed only when your switch is connected to anothermanufacturer’s switches adopting proprietary spanning tree protocols.z To enable the digest snooping feature, the interconnected switches and another manufacturer’sswitch adopting proprietary spanning tree protocols must be configured with exactly the same MSTregion-related configurations (including region name, revision level, and VLAN-to-instancemapping).z The digest snooping feature must be enabled on all the switch ports that connect to anothermanufacturer’s switches adopting proprietary spanning tree protocols in the same MST region.z When the digest snooping feature is enabled globally, the VLAN-to-instance mapping table cannotbe modified.z The digest snooping feature is not applicable to boundary ports in an MST region.z The digest snooping function is not applicable to edge ports in an MST region.Examples# Enable the digest snooping feature on Ethernet 1/0/1.z Enable the digest snooping feature on Ethernet 1/0/1 in Ethernet port view. system-viewSystem View: return to User View with Ctrl+Z.[Sysname] interface Ethernet 1/0/1[Sysname-Ethernet1/0/1] stp config-digest-snooping[Sysname-Ethernet1/0/1] quit[Sysname] stp config-digest-snoopingz Enable the digest snooping feature on Ethernet 1/0/1 in system view. system-viewSystem View: return to User View with Ctrl+Z.[Sysname] stp interface Ethernet 1/0/1 config-digest-snooping[Sysname] stp config-digest-snooping# Enable the digest snooping feature on Ethernet 1/0/2 to Ethernet 1/0/4. system-view[Sysname] stp interface Ethernet 1/0/2 to Ethernet1/0/4 config-digest-snooping[Sysname] stp config-digest-snoopingstp costSyntaxz Ethernet port view:stp [ instance instance-id ] cost costundo stp [ instance instance-id ] cost
