7705 SAR Interfaces
358
Interface Configuration Guide
3HE 11011 AAAC TQZZA Edition: 01
dot1q-etype
Syntax dot1q-etype 0x0600 to 0xffff
no dot1q-etype
Context config>port>ethernet
config>port>dsl
config>port>gpon
Description This command specifies the Ethertype expected when the port’s encapsulation type is dot1q.
IEEE 802.1q (also known as VLAN tagging) defines a process to channelize a single Ethernet
port or v-port into VLANs. Each VLAN can represent a customer or an application. Up to 4096
VLANs can be configured per port. For more information on VLANs and VLAN tagging, refer
to “VLL Services” in the 7705 SAR Services Guide.
The Ethertype specifies the protocol being carried in an Ethernet frame. In 802.1q, the
Ethertype is set to the Tag Protocol Identifier (TPID) value of 0x8100, which identifies the
frame as an IEE 802.1Q-tagged frame. As well, 2 bytes of Tag Control Information (TCI),
followed by 2 bytes containing the frame’s original Ethertype are added to the frame.
Together, the TPID and TCI make up the VLAN tag.
For Ethernet ports, when the port encap-type is qinq, the dot1q-etype value sets the
Ethertype for the inner VLAN tag. The qinq encapsulation type is not supported by a v-port,
or by DSL or GPON modules on the 7705 SAR-M. However, qinq encapsulation is supported
by the DSL block on the 7705 SAR-Wx.
Network ports do not allow dot1q-etype settings.
The no form of this command resets the dot1q-etype value to the default.
Default 0x8100
Parameters 0x0600 to 0xffff — specifies the Ethertype to expect
down-when-looped
Syntax down-when-looped
Context config>port>ethernet
config>port>dsl
config>port>gpon
Description This command enables the down-when-looped feature on Ethernet ports or v-ports. When
the down-when-looped feature is activated, a keepalive loop PDU is transmitted periodically
toward the network. The port listens for returning keepalive loop PDUs. A loop is detected if
any of the received PDUs have an Ethertype value of 9000 and the source and destination
MAC addresses are identical to the MAC address of the port. When a loop is detected, the
port is immediately brought down.
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