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that when a port is selected as root port and specified port, the delay time of entering the
forwarding state is reduced greatly. In this way, the time needed by the network topology to
become stable is reduced.
RSTP can be transferred rapidly, but it has some defects like STP. All the bridges in the LAN
share one spanning tree and cannot block redundant links by VLAN. The packets of all VLANs
are forwarded according to one spanning tree.
MSTP defined in IEEE802.1s can make up the defects of STP and RSTP. It can be transferred
rapidly and forward the traffic of different VLANs according to their own paths. In this way, the
better traffic load balance mechanism is provided.
MSTP has the following features:
MSTP shears the loop network to a tree network without loops to prevent the packets from
increasing and circulating endlessly in the loop network.
MSTP divides the whole switching network to multiple domains and all the domains are
connected by a common spanning tree (CST).
MSTP sets VLAN mapping table (that is the corresponding relationship between VLAN and
spanning tree example) and associates the VLAN with the spanning tree. Multiple spanning
trees are formed in each domain.
They are independent from each other and realize the load balance of VLAN data when
forwarding data.
MSTP has the features of rapid convergence and fault recovering.
MSTP is compatible with STP and RSTP.
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Страница 245: ...245 SIGNAMAX LLC www signamax eu Application Example Example of configuring DHCP Snooping ...
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Страница 655: ...287 SIGNAMAX LLC www signamax eu Sub VLAN members in the system ...