Vlan Translation - Alcatel-Lucent 7705 Service Manual

Raw Mode
In raw mode, VLAN tags are not service affecting (that is, the port is set to null and the tags
do not affect frame forwarding decisions) and are forwarded over the Epipe as part of the
payload.
If a service-affecting tag arrives from the ingress AC (that is, the port is set to dot1q and a
tag is received), the tag is removed (popped) from the payload before the Ethernet frame gets
switched over the PSN via the Epipe.
In raw mode, all traffic from the ingress port gets switched to the same endpoint. However,
if the MTU (or configured size) of the tunnel is exceeded then service is affected because the
frame is dropped.
In raw mode, when the 7705 SAR detects a failure on the Ethernet ingress port or the port is
administratively disabled, the 7705 SAR sends a PW status notification message to the
remote router.
Tagged Mode
In tagged mode, every frame sent on the Ethernet PW has a service-affecting VLAN tag. If
the frame received by the 7705 SAR from the attachment circuit (AC) does not have a
service-affecting VLAN tag, then the 7705 SAR inserts (pushes) a VLAN tag into the frame
header before sending the frame to the SDP and the PW. If the frame received from the AC
has a service-affecting VLAN tag, the tag is replaced.
In tagged mode, when the 7705 SAR detects a failure on the Ethernet physical port or the
port is administratively disabled, the 7705 SAR sends a PW status notification message for
all PWs associated with the port.

VLAN Translation

VLAN ID translation is supported, as appropriate.
VLAN ID translation operation for the various packet types. The payload part of the packet
is shown in parentheses.
The operations to add, strip (remove), or forward the VLAN headers are performed based on
the encapsulation type at the ingress of the attachment circuit (the SAP), in the network, and
at the egress circuit.
7705 SAR OS Services Guide
Table 24 (see Tagging Rules) shows the
VLL Services
Page 163