CANOGA PERKINS 9145EMP NID Software Version 3.1 User Manual
Page 190
9145EMP NID Software User’s Manual
VLAN Multiplexing
VLAN Multiplexing
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If a user port has All-to-One Bundling configured on it, no other VLAN multiplexing
records can be configured on that port. Similarly, if a Service Multiplexing record exists on
a user port, no All-to-One record can be configured on that particular port.
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A VLAN multiplexing record can contain only C-VLANs from a single user port. VLAN
multiplexing records do not span across user ports.
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A C-VLAN can belong to only one VLAN multiplexing record per port.
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The S-VLAN of the VLAN multiplexing record is unique across the system.
12.1.2 User-to-Network Functionality
On the user ports, the system accepts all Ethernet framing formats supported by 802.1ad-2005
standard. Frames are classified as:
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Priority tagged frames (Ethertype 0x8100, VID 0)
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C-Tagged frames (Ethertype 0x8100, VID != 0)
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Untagged frames that are neither priority tagged nor C-Tagged. Hence S-tagged frames
and all other types of tagging are treated as untagged frames on the User side port.
Based on the frame tagging and VLAN Multiplexing records configured on the ingress port, the
frame is forwarded to the network port, tagged with a specific S-Tag as an outer tag.
If there is no corresponding VLAN Multiplexing record for the ingress C-Tag, the frame is
dropped.
12.1.3 Network-to-User Functionality
On the network port, the system accepts S-Tagged frames, namely frames tagged with Ethertype
0x88a8 and a non-zero VID. Untagged frames are accepted, for example, PDUs for a low-level
untagged MEP, or control protocol frames.
If there is a VLAN multiplexing record corresponding to the ingress S-Tag, the frame is forwarded
to the User port indicated by the record, and stripped of the S-Tag. If no VLAN Multiplexing
record is found, the frame is dropped.
12.1.4 Statistics
A VLAN multiplexing record keeps statistics, as follows:
For an All-to-One Bundling VLAN multiplexing record, the following counters are kept:
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Number of transmitted frames and bytes at the User Port
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Number of received frames and bytes at User Port