4000 Router Series Layer 2 - LAN Switching Configuration Guide

MSTP implementation on devices

MSTP is compatible with STP and RSTP. Devices that are running MSTP and that are used for spanning

tree calculation can identify STP and RSTP protocol packets.

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

• Port role restriction

• TC-BPDU transmission restriction

• Support for hot swapping of interface cards and active/standby changeover.

Protocols and standards

MSTP is documented in the following protocols and 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

• IEEE 802.1Q-REV/D1.3, Media Access Control (MAC) Bridges and Virtual Bridged Local Area

Networks —Clause 13: Spanning tree Protocols

Spanning tree configuration task lists

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).

Configurations made in system view take effect globally. Configurations made in Ethernet interface view

take effect on the interface only.