Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 304

Configuration Commands
An access port or channel is used for customer facing traffic on which services are configured. A
Service Access Point (SAP) can only be configured on an access port or channel. When a port is
configured for access mode, the appropriate encap-type must be specified to distinguish the services
on the port or SONET path. Once an Ethernet port, a TDM channel or a SONET path has been
configured for access mode, multiple services can be configured on the Ethernet port, a TDM channel
or SONET path. Note that ATM, Frame Relay, and cHDLC port parameters can only be configured in
the access mode.
An access port or channel is used for customer facing traffic on which services are configured. A
Service Access Point (SAP) can only be configured on an access port or channel. When a port is
configured for access mode, the appropriate encap-type must be specified to distinguish the services
on the port or SONET path. Once an Ethernet port, a TDM channel or a SONET path has been
configured for access mode, multiple services can be configured on the Ethernet port, a TDM channel
or SONET path. Note that ATM, Frame Relay, and cHDLC port parameters can only be configured
in the access mode.
A network port or channel participates in the service provider transport or infrastructure network
when a network mode is selected. When the network option is configured, the encap-type cannot be
configured for the port/channel.
When network mode is selected on a SONET/SDH path, the appropriate control protocols are
activated when the need arises. For example, configuring an IP interface on the SONET path
activates IPCP while the removal of the IP interface causes the IPCP to be removed. The same
applies for MPLS, MPLSCP, and OSICP. When configuring a SONET/SDH port, the mode
command must be entered in the channel context or an error message is generated.
A hybrid Ethernet port allows the combination of network and access modes of operation on a per-
VLAN basis and must be configured as either dot1q or QinQ encapsulation.
When the hybrid port is configured to the dot1q encapsulation, the user configures a SAP inside a
service simply by providing the SAP ID which must include the port-id value of the hybrid mode port
and an unused VLAN tag value. The format is <port-id>:qtag1. A SAP of format <port-id>:* also
supported.
The user configures a network IP interface under config>router>interface>port by providing the port
name which consists of the port-id of the hybrid mode port and an unused VLAN tag value. The
format is <port-id>:qtag1. The user must explicitly enter a valid value for qtag1. The <port-id>:*
value is not supported on a network IP interface. The 4096 VLAN tag space on the port is shared
among VLAN SAPs and VLAN network IP interfaces.
When the hybrid port is configured to QinQ encapsulation, the user configures a SAP inside a service
simply by providing the SAP ID which must include the port-id value of the hybrid mode port and the
outer and inner VLAN tag values. The format is <port-id>:qtag1.qtag2. A SAP of format <port-id>:
qtag1.* is also supported. The outer VLAN tag value must not have been used to create an IP
network interface on this port. In addition, the qtag1.qtag2 value combination must not have been
used by another SAP on this port.
The user configures a network IP interface under config>router>interface>port by providing the port
name which consists of the port-id of the hybrid mode port and a VLAN tag value. The format is
<port-id>:qtag1.*. An outer VLAN tag qtag2 of * is used to create an IP network interface. In
addition, the qtag1.qtag2 value combination must not have been used on another SAP or IP network
interface on this port.
The no form of this command restores the default.
Page 304 7750 SR OS Interface Configuration Guide