Alcatel-Lucent 7750 SR OS Service Manual page 554

VPLS Service Configuration Commands
Description
This command specifies the encapsulation type that must exist on the SAP's access port to allow the
SAP membership within the egress-multicast-group. The config>port>ethernet>access>encap-type
command is used to define the encapsulation type for the Ethernet port. The allowed encapsulation
type values are dot1q and null. If the SAP does not exist on a port with the specified encap-type, it
will not be allowed into the egress-multicast-group.
If at least one SAP is currently a member of the efficient-multicast-group, the encap-type cannot be
changed within the sap-common-requirements node. If the efficient-multicast-group does not contain
any member SAPs, the encap-type may be changed at any time.
There is no interaction between an efficient-multicast-group and the corresponding access ports
associated with its members since all SAPs must be deleted from a port before its encap-type can be
changed. When the SAPs are deleted from the port, they are also automatically deleted from the
efficient-multicast-group.
The no form of the command returns the egress-multicast-group required encapsulation type for
SAPs to dot1q. If the current encap-type is set to null, the command cannot be executed when SAPs
exist within the egress-multicast-group.
Default
dot1q — For an egress-multicast-group.
null — If member SAPs are on a null encapsulated access port.
Parameters
null — The null keyword is mutually exclusive with the dot1q keyword. When the encap-type
dot1q — The dot1q keyword is mutually exclusive with the null keyword. When the encap-type
dot1q-etype
Syntax dot1q-etype [0x0600..0xffff]
no dot1q-etype
Context config>service>egress-multicast-group>sap-common-requirements
Description
This command specifies the dot1q EtherType that must exist on the SAP's access port to allow the
SAP membership within the egress-multicast-group. The config>port>ethernet>access>dot1q-
etype command is used to define the EtherType used when encapsulating a packet with a dot1q tag on
the Ethernet port. Any valid EtherType is allowed on the port.
If the current encap-type for the egress-multicast-group is set to null, the dot1q-etype EtherType is
ignored when evaluating SAP membership in the group. If the encap-type is set to dot1q (the default),
a member SAP's access port must be configured with the same dot1q-etype EtherType as the egress-
multicast-group.
If at least one SAP is currently a member of the efficient-multicast-group, the dot1q-etype value
cannot be changed within the sap-common-requirements node. If the efficient-multicast-group does
not contain any member SAPs, the dot1q-etype value may be changed at any time.
If an access port currently has SAPs associated with it that are defined within an egress-multicast-
group and the port is currently set to encap-type dot1q, the dot1q-etype value defined on the port
cannot be changed.
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within the sap-common-requirements is specified to be null, the encapsulation type for the access
ports associated with all SAPs within the egress-multicast-group must be set to null.
within the sap-common-requirements is specified to be dot1q, the encapsulation type for the
access ports associated with all SAPs within the egress-multicast-group must be set to dot1q.
7750 SR OS Services Guide