User's Manual

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61.1.2.3 PPPoE Intermediate Agent Vendor Tag Frame
The following is the format of tag added by PPPoE IA, adding tag is the Uppermost function of PPPoE IA.
Figure 61-2 PPPoE IA - vendor tag (4 bytes in each row)
Add TLV tag as 0x0105 for PPPoE IA, TAG_LENGTH is length field of vendor tag; 0x00000DE9 is “ADSL
Forum” IANA entry of the fixed 4 bytes; 0x01 is type field of Agent Circuit ID, length is length field and Agent
Circuit ID value field; 0x02 is type field of Agent Remote ID, length is length field and Agent Remote ID value
field.
PPPoE IA supplies a default circuit ID value, the default circuit ID (The figure in the following) includes 5 fields,
ANI (Access Node Identifier) can be configured by user, its length is less than 47 bytes. If there is no ANI
configured, MAC is accessed by default, occupy 6 bytes and use space symbol to comport, “eth” occupies 3
bytes and uses space symbol to compart, “Slot ID” occupies 2 bytes, use “/” to compart and occupy 1 byte,
“Port Index” occupies 3 bytes, use “:” to compart and occupy 1 byte, “Vlan ID” occupies 4 bytes, all fields use
ASCII, user can configure circuit ID for each port according to requirement.
ANI
(n byte)
Space
( 1byte)
eth
(3 byte)
Space
(1 byte)
Slot ID
(2 byte)
/
(1byte)
Port Index
(3 byte)
:
(1 byte)
Vlan ID
(4 byte)
Figure 61-3 Agent Circuit ID value
MAC of the access switch is the default remote ID value of PPPoE IA. remote ID value can be configured by
user flexibly, the length is less than 63 bytes.
61.1.2.4 Trust Port of PPPoE Intermediate Agent
Discovery stage sends five kinds of packets, PADI and PADR packets sent by client to server, PADO and
PADS packets sent by server to client, PADT packet can be sent by server or client.
In PPPoE IA, for security and reduce traffic, set a port connected server as trust port, set ports connected