Alcatel-Lucent 6850-48 网络指南

Interaction With Other Features

Configuring VLAN Stacking

page 9-8

OmniSwitch AOS Release 6 Network Configuration Guide

• Both static and dynamic link aggregation are supported with VLAN Stacking. 

• Note that a link aggregate must consist of all UNI or all NNI ports. VLAN Stacking functionality is not 

supported on link aggregates that consist of a mixture of VLAN Stacking ports and conventional switch 
ports.

The QoS application has the following interactions with VLAN Stacking:

• QoS allocates switch resources for VLAN Stacking Service attributes, even though such attributes are 

not configurable via the QoS CLI. 

• VLAN Stacking ports are trusted and use 802.1p classification by default. 

• If there is a conflict between VLAN Stacking Service attributes and the QoS configuration, the VLAN 

Stacking attributes are given precedence over QoS policies.

• QoS applies the inner source vlan and inner 802.1p policy conditions to the CVLAN (inner) tag of 

VLAN Stacking packets.

• QoS applies the source vlan and 802.1p policy conditions to the SVLAN (outer) tag of VLAN Stack-

ing packets. 

• Quarantine Manager and Remediation (QMR) is not available if VLAN Stacking services or QoS 

inner source vlan and inner 802.1p policies are configured on the switch. 

• RRSTP is only supported on VLAN Stacking NNI ports; UNI ports are not supported.

• An RRSTP ring must consist of either all VLAN Stacking NNI ports or all standard switch ports; a 

mixture of the two port types in the same ring is not supported.

• If an RRSTP ring contains NNI ports, the VLAN tag configured for the ring must match the SVLAN 

tag that VLAN Stacking appends to packets before they are received or forwarded on NNI ports.

• Spanning Tree is enabled by default for VLAN Stacking SVLANs. The Spanning Tree status for an 

SVLAN is configurable through VLAN Stacking commands. Note that the SVLAN Spanning Tree 
status applies only to the service provider network topology.

• BPDU frames are tunneled by default. See 

 for information 

about configuring VLAN Stacking to tunnel or discard Spanning Tree BPDU.

• See 

 for information about configuring 

VLAN Stacking interoperability with legacy Spanning Tree BPDU systems.

• A back door link configuration is not supported. This occurs when there is a link between two customer 

sites that are both connected to a VLAN Stacking provider edge switch.

• A dual home configuration is not supported. This type of configuration consists of a single customer 

site connected to two different VLAN Stacking switches or two switches at a customer site connect to 
two different VLAN Stacking switches.