Effects of QinQ on other switch features
Per the IEEE standards, protocols such as STP and GVRP are assigned separate addresses for customer networks and provider networks, ensuring that QinQ has no impact on their operations. Bridge Protocol Data Units (BPDUs) that need to be tunneled through the provider network are treated as normal multicast frames at the provider bridge and forwarded out.
However, other protocols use common addresses for both customer and provider networks, and so are not supported when QinQ is enabled on the switch. Similarly, proprietary features such as discovery, UDLD, and loop-protect do not provide tunneling support. In such cases, where provider networks could run an instance of the same protocol as a customer could run local to their site, these frames are dropped at the customer-network ports of the provider bridge.
The IEEE standards group is devising new addressing schemes that may support additional QinQ tunneling operations. Check the latest product release notes for implementation updates as they apply to switches.
When QinQ is not enabled (the default setting), there are no impacts to the switch's normal operations. The following table shows the impacts of QinQ on the operation of switch protocols and features based on the QinQ mode that is configured as QinQ mixed VLAN mode (C-VLANs and S-VLANs are allowed) or QinQ S-VLAN mode (S-VLANs only).
Switch feature |
Impacts of QinQ configurations and allowed operations |
---|---|
ACLs |
In QinQ mixed VLAN or S-VLAN modes:
|
aaa |
In QinQ mixed VLAN mode:
|
arp-protect |
In QinQ mixed VLAN mode:
|
CDP |
In QinQ VLAN or S-VLAN modes:
|
DHCP |
In QinQ mixed VLAN or S-VLAN modes:
|
directed-broadcast |
In QinQ S-VLAN mode:
|
GVRP |
In QinQ mixed VLAN mode:
|
igmp-proxy |
In QinQ mixed VLAN mode:
|
IPv6 |
In QinQ mixed VLAN mode:
|
ip-recv-mac |
In QinQ mixed VLAN mode:
|
Jumbo |
In QinQ mixed VLAN or S-VLAN modes:
|
LACP/ Port Trunks |
In QinQ mixed VLAN mode:
|
Layer 3 Protocols (IP, IP+, DHCP, ARP, IGMP Layer 3, Layer 3 ACLs) |
In QinQ mixed VLAN mode:
|
LLDP |
In QinQ mixed VLAN or S-VLAN modes:
|
load-sharing |
In QinQ S-VLAN mode:
|
management VLAN |
In QinQ mixed VLAN mode:
|
Mirroring/Monitoring |
In QinQ mixed VLAN mode:
|
multicast-routing |
In QinQ S-VLAN mode:
|
QoS |
In QinQ mixed VLAN or S-VLAN modes:
|
Routing |
In QinQ S-VLAN mode:
|
source-binding |
In QinQ mixed VLAN or S-VLAN modes:
|
source-route |
In QinQ S-VLAN mode:
|
Spanning Tree |
In QinQ mixed VLAN mode:
|
Stacking |
In QinQ mixed VLAN mode:
|
UDLD |
In QinQ mixed vlan or S-VLAN modes:
|
udp-bcast-forward |
In QinQ S-VLAN mode:
|
unknown-vlans |
In QinQ mixed VLAN mode:
|
Voice VLANs |
In QinQ mixed VLAN mode:
|
VRRP |
In QinQ mixed VLAN or S-VLAN modes:
|