Table 5-2 Processing VLAN tags carried in packets from the PW by the AC
AC Interface Type Processing of the VLAN Tag
Ethernet, GE, XGE or Eth-Trunk interface Do not process the packet.
VLANIF interface If an S tag is carried in a packet, rewrite the S
tag.
If no S tag is carried in a packet, add an S tag
in the packet.
VLAN stacking sub-interface If an S tag is carried in a packet, delete the S
tag from the packet.
If no S tag is carried in a packet, do not
process the packet.
VLAN mapping sub-interface If an S tag is carried in a packet, rewrite the S
tag.
If no S tag is carried in a packet, add an S tag
in the packet.
NOTE
The added or replaced tag is the VLAN tag on the
interface where VLAN mapping is not performed.
Dot1q sub-interface
If an S tag is carried in a packet, do not process
the packet.
If no S tag is carried in a packet, add an S tag
in the packet.
NOTE
If Ethernet encapsulation is adopted, the packets
sent from the PW to the AC do not carry any S tag.
In this case, the Dotlq sub-interface is required to
allow packets of only one VLAN to pass.
QinQ sub-interface
If an S tag is carried in a packet, rewrite the S
tag.
If no S tag is carried in a packet, add an S tag
in the packet.
NOTE
When VLL or VPLS is deployed on the F48CEAT, G48SFA, or G48TFA, if the PVID on the outbound
interface is the same as the VLAN ID of the packets, the interface removes the VLAN tag from the packet;
otherwise, the VLAN tag is not removed.
VLL FRR
With the wide applications of VLLs, the requirement for the reliability of VLLs becomes
increasingly high, especially for L2VPNs that carry real-time services such as VoIP and IPTV.
Virtual Lease Line Fast Reroute (VLL FRR) is one of the solutions to increasing the reliability
of L2VPNs.
VLL FRR is mainly used in the following networking mode:
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 5 VLL Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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