Configuring Bridging
96
EtherXtend User’s Guide
Q-in-Q VLAN tagging
The IEEE 802.1ad (also know as Q-in-Q VLAN tagging) expands the VLAN
space in the Ethernet frame to support the tagging of previously tagged
packets. This second tag (SLAN) creates a "double-tagged" Ethernet frame.
The double-tagged Ethernet frame enables service providers to offer
additional services, such as Internet access on specific SLANs for specific
customers, while still providing single-tagged VLAN services.
The EtherXtend also supports setting COS values in the Ethernet SLAN
headers for bridged packets. This service enables you to assign a service level
or class of service (COS) to an Ethernet SLAN that is transported across a
uplink, intralink, or downlinked s-tagged bridge. The configured COS level
specifies the packet priority and queueing methods used to transport the
packet through the Ethernet network. The EtherXtend sets and preserves the
COS settings to ensure these settings are passed to other Ethernet devices in
the network for QOS processing.
Note:
Ethernet interfaces can be addressed as either
eth
or
ethernetcsmacd
. The
eth
abbreviation is used in command output.
For Q-in-Q VLAN tagging, the bridge profile supports the following
parameters:
•
s-tagTPID
Identifies the type of VLAN ID used. Typically set to 8100.
•
s-tagID
Specifies the SLAN ID assigned to an Ethernet frame.
•
s-tagStripAndInsert
Specifies whether to strip and insert s-tag values in Ethernet frames
received and transmitted on the bridge interface.
•
s-tagOutgoingCOSOption
Specifies whether to insert COS value bits on outgoing s-tag packets.
•
s-tagIDCOS
Specifies the COS ID associated with the SLAN ID
•
s-tagOutgoingCOSValue
Specifies the value used to overwrite any existing COS value in outgoing
s-tag packets.
The
bridge add
command supports adding s-tag IDs from the command line.
This example adds interface
1-1-2-0/eth downlink
with VLAN 100, SLAN
200, COS value of 7 and sCOS value of 6.
zSH>
bridge add 1-1-2-0/eth downlink vlan 100 slan 200 tagged cos 7 scos 6
Adding bridge on 1-1-2-0/eth
Created bridge-interface-record 1-1-2-0-eth-100/bridge
Summary of Contents for EtherXtend 3300 Series
Page 8: ...Contents 6 EtherXtend User s Guide...
Page 18: ...Overview 16 EtherXtend User s Guide...
Page 70: ...Basic Configuration 68 EtherXtend User s Guide...
Page 132: ...Advanced Configuration 130 EtherXtend User s Guide...
Page 146: ...IP Service Level Agreement 144 EtherXtend User s Guide...
Page 150: ...Index 148 EtherXtend User s Guide...