L2PT and protocol filtering is implemented in software, so the number of frames that can be
filtered or tunneled is limited.
Both L2PT and protocol filtering can be configured only through CLI.
Configuration through SNMP/XML is not supported for this
If L2PT configurations are made on PWs, these configurations are lost on
a restart of the MPLS process unless the L2PT process is also
If L2PT configurations are made on a VPLS or VPWS service,
dot1p tag inclusion must be enabled on the VPLS/VPWS. Also, VPLS or VPWS service must have same
VLAN IDs at each end of a PW.
When tunneling protocols are point-to-point in nature, it is your responsibility to ensure
that there are only two tunnel endpoints for the protocol.
If a protocol that is configured to be tunneled on a service interface cannot be uniquely
identified by its destination address and EtherType, then all packets with the same DA and
EtherType of the protocol being tunneled (but that are not really PDUs of the protocol) will be
slow path forwarded.
Tagged protocol PDUs cannot be tunneled over VLANs. Tagged protocol PDUs can only be
tunneled over VMANs (the VMAN can be the service VMAN for a VPLS/VPWS service, or a standalone
VMAN). Untagged protocol PDUs can be tunneled over both VLANs and VMANs (the VLAN/VMAN can be
standalone, or be the service VMAN for a VPLS/VPWS service).
Untagged protocol PDUs cannot be bypassed if the ingress port is an untagged VMAN port with
a default CVID. Untagged protocol PDUs can be bypassed if the ingress port is an untagged VMAN
port without a default CVID.
In VPLS, only full-mesh configuration is supported for L2PT.
L2PT is not supported on VLAN ports that have a port specific tag.