There are no checks on PVSTAG configuration—misconfiguration may result in incorrect operation of the
PVST protocol in the access devices (for example, an STP dispute being detected).
Caution
These guidelines are illustrated in the following figure:
Figure 65: PVSTAG Guidelines
The configuration steps listed in the following sections show all of the configurable parameters. However, in
general, most of these can be retained with the default values.
Note
PVSTAG Topology Restrictions
These restrictions are applicable to PVSTAG topology:
• Only a single access device can be attached to the gateway devices.
• Topology change notifications on a single VLAN affect all VLANs and bridge domains on that physical
interface.
SUMMARY STEPS
1. configure
2. spanning-tree mstag pvstag protocol instance identifier
3. preempt delay for interval { seconds | minutes | hours }
4. interface type interface-path-id or interface Bundle-Ether bundle-id
5. vlan vlan-id
6. root-priority priority
7. root-id id
8. root-cost cost
9. priority priority
10. bridge-id id
11. port-priority priority
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
443
Implementing Multiple Spanning Tree Protocol
Configuring PVSTAG parameters
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