1-32Performing mCheck in interface viewFollow these steps to perform mCheck in interface view:To do... Use the command... RemarksEnter system view system-view —Enter Ethernet interface view or Layer-2aggregate interface viewinterface interface-typeinterface-number —Perform mCheck stp mcheck RequiredConfiguration Example# Perform mCheck on port GigabitEthernet1/0/1.1) Method 1: Perform mCheck globally. system-view[Sysname] stp mcheck2) Method 2: Perform mCheck in interface view. system-view[Sysname] interface gigabitethernet 1/0/1[Sysname-GigabitEthernet1/0/1] stp mcheckConfiguring Digest SnoopingAs defined in IEEE 802.1s, interconnected devices are in the same region only when the region-relatedconfiguration (domain name, revision level, VLAN-to-MSTI mappings) on them is identical. An MSTPenabled device identifies devices in the same MST region via checking the configuration ID in BPDUpackets. The configuration ID includes the region name, revision level, configuration digest that is in16-byte length and is the result calculated via the HMAC-MD5 algorithm based on VLAN-to-MSTImappings.Since MSTP implementations differ with vendors, the configuration digests calculated using privatekeys is different; hence different vendors’ devices in the same MST region can not communicate witheach other.Enabling the Digest Snooping feature on the port connecting the local device to another vendor’s devicein the same MST region can make the two devices communicate with each other.Configuration PrerequisitesAssociated devices of different vendors are interconnected and run MSTP.
