Manual

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traveling in the ISP internet network while carrying two VLAN tags (the inner tag is added when
entering PE1, and the outer is SPVID), whereas the VLAN information of the user network is
open to the provider network. When the packet reaches PE2 and before being forwarded to
CE2 from the client port on PE2, the outer VLAN tag is removed, then the packet CE2 receives
is absolutely identical to the one sent by CE1. For the user, the role the operator network plays
between PE1 and PE2, is to provide a reliable layer-2 link.
The technology of Dot1q-tuunel provides the ISP internet the ability of supporting many client
VLANs by only one VLAN 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 1~4096 at users’ will).
The user network is considerably independent. When the ISP internet is upgrading their
network, the user networks do not have to change their original configuration.
Detailed description on the application and configuration of dot1q-tunnel will be provided in this
section.
9.3.2 Dot1q-tunnel Configuration
Configuration Task Sequence of Dot1q-Tunnel:
1. Configure the dot1q-tunnel function on port
2. Configure the protocol type (TPID) on port
1. Configure the dot1q-tunnel function on port
2. Configure the protocol type (TPID) on port
Command
Explanation
Port mode
dot1q-tunnel enable
no dot1q-tunnel enable
Enter/exit the dot1q-tunnel mode on the
port.
Command
Explanation
Port mode
dot1q-tunnel tpid {0x8100|0x9100|0x9200|<1-
65535>}
Configure the protocol type on TRUNK port.