Chapter 25 VLAN
IES4005M User’s Guide
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• The uplink port joins the NNI VLAN specified in VLAN modes, multicast VLAN, the management
VLAN, and the VoIP VLAN.
25.1.1 Transparent VLAN Mode
• Transparent VLAN does not change the type of the VLAN tag in uplink and DSL ports.
• In the uplink port, the VLAN Tag Protocol Identifier (TPID) is a Service provider Tag Protocol
Identifier (S TPID). You can configure the S-tag TPID to be the same as the Customer TPID (C
TPID) (0x8100), and the users will think it is fully transparent.
• You cannot use other VLAN modes on a port using transparent VLAN.
Note: Use the interface ge-nni <portlist> and vlan all commands to add Gigabit
Ethernet uplink ports to all VLANs (1 ~ 4093) to make sure VLAN transparent
traffic can go through the uplink.
25.1.2 VLAN Tagging and Trunk Mode
• An S tag with PVID is added in the NNI side for untagged packets from the UNI side.
• The VLAN ID for single-tagged packets is not changed on either side, but the Tag Protocol
Identifier (TPID) is different. The Service provider Tag Protocol Identifier (S TPID) is on the NNI
side and a Customer TPID (C TPID) is on the UNI side.
• The IES only forwards traffic for VLANs configured on the UNI side. If you configure the UNI side
as untagged only, the IES only forwards untagged packets.
• VLAN tagging and trunk can co-exist with other VLAN modes except transparent VLAN.
25.1.3 Stacking VLAN Tagging and Trunk Mode
• Compared to VLAN tagging and trunk mode this mode adds an outer tag.
Table 117 Transparent VLAN CLI Examples
VLAN MODE NNI VLAN UNI VLAN CLI EXAMPLES
Transparent (PTM)
untag
S(VID a)
untag
C(VID a)
interface dsl 2/1
vlan transparent
Transparent (ATM)
untag
S(VID a)
untag
C(VID a)
interface dsl 2/1
vlan transparent atm-vc 0/33
Table 118 VLAN Tagging and Trunk CLI Examples
VLAN MODE
NNI
VLAN
UNI
VLAN
CLI EXAMPLES
VLAN Tagging and
Trunk (PTM-untagged)
S(PVID) untag
interface dsl 2/1
vlan trunk uni-untag svlan 100 spbit 0
VLAN Tagging and
Trunk (ATM-untagged)
S(PVID) untag
interface dsl 2/1
vlan trunk atm-vc 0/33 uni-untag svlan 100
spbit 0
VLAN Tagging and
Trunk (PTM-tagged)
S(VID a) C(VID a)
interface dsl 2/1
vlan trunk uni-vlan 100
VLAN Tagging and
Trunk (ATM-tagged)
S(VID a) C(VID a)
interface dsl 2/1
vlan trunk atm-vc 0/33 uni-vlan 100
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