Multiple Instance Spanning-Tree Operation

Configuring MSTP

On other ProCurve switches, only the VLANs that are present will be included, that is, only VLANs 1, 5, and 7 would be included. The switch will map these VLANs to MSTP Instance 1, which results in a Configuration Digest that is not the same as the Configuration Digest for the switches running this enhance- ment. (See Figure 4-10and Figure 4-11)

Figure 4-10shows an example of an MSTP instance configured with the VLAN range option. All the VLANs are included in the instance whether they exist or not. Figure 4-11shows an example of an MSTP instance configured on another ProCurve switch. Only VLANs 1, 5, and 7 are included in the instance.

ProCurve(config)# show spanning-tree mst-config

MST Configuration Identifier Information

MST Configuration Name: MSTP1

MST Configuration Revision: 1

MST Configuration Digest: 0x51B7EBA6BEED8702D2BA4497D4367517

IST Mapped VLANs :

Instance ID Mapped VLANs

-------- ---------------

1 1-10

Figure 4-10. An Example of Mapping VLANs with the Range Option where all VLANs are Included

The Configuration Digest value shown in Figure 4-11is not the same as in Figure 4-10,indicating that these switches do not operate in the same instance.

The Common Spanning Tree (CST) will still have the correct root associations.

ProCurve(config)# show spanning-tree mst-config

MST Configuration Identifier Information

MST Configuration Name: MSTP1

MST Configuration Revision: 1

MST Configuration Digest: 0x89D3ADV471668D6D832F6EC4AA9CF4AA

IST Mapped VLANs :

Instance

ID

Mapped VLANs

--------

---------------

1

1,

5,

7

Figure 4-11. Example of Mapping VLANs on Other ProCurve Switches

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