7-30
QinQ (Provider Bridging)
Effects of QinQ on Other Switch Features
LACP/
Port Trunks
In QinQ mixed vlan mode:
• Dynamic-LACP is not supported on S-VLAN ports: LACP manual trunks
alone are supported. The new trunk will be a member of C-VLANs (port
types are not applicable).
• If two ports are added to a trunk, the resultant trunk will be a member
of the default-vlan (vid-1) which is always a C-VLAN. The trunk can
subsequently be manually assigned to an S-VLAN.
• Port-type and VLAN configurations are not mapped. If the port-type is
updated through CLI or SNMP and the port is subsequently moved from
the C-VLAN space to the S-VLAN space then back again, the last
configured port-type is retained through each move.
In QinQ svlan mode:
• On svlan bridges, both manual and dynamic LACP trunks are supported.
It is not recommended to configure dynamic trunks on 'customer' ports
because they cannot become dynamic members of SVLANs (there is
no provider-gvrp for a dynamic trunk to become a member of S-VLANs.)
• A newly formed trunk will by default be of type 'provider-network'.
When the trunk is manually assigned to an S-VLAN for the first time
after being created, the port-type is 'provider-network'.
Layer 3
Protocols (IP,
IP+, DHCP, ARP,
IGMP Layer 3,
Layer 3 ACLs)
In QinQ mixed vlan mode:
• There is no IP layer functionality on S-VLANs.
• No change in IP layer functionality on regular C-VLANs.
• S-VLANs cannot be configured as RIP, OSPF, PIM, or VRRP interfaces.
In QinQ svlan mode:
• S-VLANs can be ip enabled.
• IP routing is NOT supported.
LLDP In QinQ mixed vlan or svlan modes:
• LLDP is supported on the device (in both qinq modes). However, there
is no provision for tunneling customer LLDP BPDUs through the
provider-network.
• LLDP BPDUs received from a customer's network will be consumed at
the customer-network ports of a provider device and the customer
device will be displayed as an LLDP neighbor. Similarly the provider
network device will show up as a neighbor on the customer's network
if the customer-network ports send out LLDP advertisements.
load-sharing In QinQ svlan mode:
• Equal cost multi-path (ECMP) is NOT supported on provider core
devices.
management
VLAN
In QinQ mixed vlan mode:
• The management VLAN cannot be an S-VLAN.
Meshing In QinQ mixed vlan mode:
• Meshing is NOT supported on the device.
In QinQ svlan mode:
• On an all provider-network ports of an svlan-bridge, meshing is
supported.
• Meshing cannot be enabled on customer-network ports.
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