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In MSTP, a VLAN packet is forwarded along the following paths:
•
Within an MST region, the packet is forwarded along the corresponding MSTI.
Between two MST regions, the packet is forwarded along the CST.
•
Implementation of MSTP on routers
MSTP is compatible with STP and RSTP. STP and RSTP protocol packets can be recognized by routers
running MSTP and used for spanning tree calculation.
In addition to basic MSTP functions, the following functions are provided for ease of management:
•
Root bridge hold
Root bridge backup
•
Root guard
•
BPDU guard
•
Loop guard
•
•
TC-BPDU guard
BPDU drop
•
Support for hot swapping of interface cards and active/standby changeover.
•
Protocols and standards
The spanning tree protocols are documented in the following standards:
•
IEEE 802.1d: Media Access Control (MAC) Bridges
IEEE 802.1w: Part 3: Media Access Control (MAC) Bridges—Amendment 2: Rapid Reconfiguration
•
IEEE 802.1s: Virtual Bridged Local Area Networks—Amendment 3: Multiple Spanning Trees
•
Spanning tree configuration task list
Before configuring a spanning tree, you must determine the spanning tree protocol to be used (STP, RSTP,
or MSTP) and plan the device roles (the root bridge or leaf node).
Complete the following tasks to configure STP:
Task
Configuring the root
bridge
Setting the spanning tree mode
Configuring the root bridge or a secondary root
bridge
Configuring the device priority
Configuring the network diameter of a switched
network
Configuring spanning tree timers
Configuring the timeout factor
38
Remarks
Required
Configure the router to work
in STP-compatible mode.
Optional
Optional
Optional
Optional
Optional
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