Dot1Q-Tunnel Configuration - Planet XGS3-42000R User Manual

Unsymmetrical
CE1
connection
Customer
networks1
This port on PE1 is enabled
QinQ and belong to VLAN3
As shown in above, aft er being enabled on the user port, dot1q-t unnel assigns each user an SPVLAN
identification (SPVID). Here the identification of user is 3. Same SPVID should be assigned for the same
network user on different PEs. When packet reaches PE1 from CE1, it carries the VLAN tag 200-300 of the
user internal network. Since the dot1q-tunnel function is enabled, the user port on PE1 will add on the packet
another VLAN tag, of which the ID is the SPVID assigned to the user. Afterwards, the packet will only be
transmitted in VLAN3 when traveling in the ISP internet net work while carrying two VLAN tags (the inner tag is
added when entering PE 1, and the outer is SPVID), whereas the VLA N information of the user net work is
open to the provider net work. When the packet reaches PE2 and before being forwarded t o CE 2 from the
client port on PE2, the outer VLA N tag is removed, then the packet CE2 receives is absolut ely identical to the
one sent by CE1. For the user, the role the operat or network plays bet ween PE1 and PE 2, is to provide a
reliable layer-2 link.
The technology of Dot1q-tuunel provides the ISP internet the ability of supporting many client VLA Ns by only
one VLA N of theirselves. Both the ISP internet and the clients can configure their own VLAN independently.
It is obvious that, the dot1q-tunnel function has got following characteristics:
 Applicable through simple static configuration, no complex configuration or maintenance to be needed.
 Operators will only have to assign one SPVID for each user, which increases the number of concurrent
supportable users; while the users has got the ultimate freedom in selecting and managing the VLAN
IDs (select within 1~4094 at users' will).
 The user network is considerably independent. When the ISP internet is upgrading their network, the
user net works do not have to change their original configuration.
Detailed description on the application and configuration of dot1q-tunnel will be provided in this section.

14.3.2 Dot1q-tunnel Configuration

Configuration Task Sequence of Dot1q-Tunnel:
1. Configure the dot1q-tunnel function on the ports
Port mode
On the customer port
Trunk VLAN 200-300
PE1
Trunk connection
Figure 14-3-1 Dot1q-tunnel based Internet working mode
Command
This port on PE1 is enabled
QinQ and belong to VLAN3
SP networks
P
Trunk connection
PE2
Unsymmetrical
connection
On the customer port
Trunk VLAN 200-300
Explanation
14-11
CE2
Customer
networks2