L2CP Processing Deployment Considerations
Use regular traffic VLANs on CO. Repeat configuration on COs of all other customer
site(s).
Case 3A
Case 3A. Customer uses Cisco PVST+, Provider uses IEEE 802.1 STP/RSTP or Cisco
PVST+.
In cases when BPDU frames (MAC 0x01-80-C2-00-00-00) are common for customer and
service provider devices it can be recommended to use MAC tunneling applied on CPE
(requires another MAC multicast address to be used instead of MAC 0x01-80-C2-00-00-00).
When using MAC tunneling, it is important to note the following:
MAC tunneling, when applied on STACKED ETH ports, works with UNTAGGED L2CP
reserved frames only.
MAC tunneling requires units with R7.0 SW (or higher) on both sides. The mechanism
mighty not work if MAC tunnel is not terminated by an ML NE.
The following configuration is allowed only if CPE has ETH port facing the customer
switches as Untagged or Tagged.
Build a tunnel by MAC (and VID) on CPE .This tunnel will forward the frame with MAC
DA modified to specified multicast address and also tagged with VID equal to one of the
VID used for regular customer traffic forwarding. Tunnel by MAC is set manually only
on port(s) facing Customer LAN. Note that the reverse direction of the tunnel on the same
NE (HSL-1 to ETH-x) is built automatically. Repeat configuration on CPEs of all other
customer site(s).
Use regular traffic VLANs on CO. Repeat configuration on COs of all other customer
site(s).
Case 3B
Case 3B. Customer uses Cisco PVST+, Provider uses IEEE 802.1 STP/RSTP
In cases when BPDU frames (MAC 0x01-80-C2-00-00-00) are common for customer and
service provider devices it can be recommended to switch Service Provider network (all
devices, including ML CO and even ML CPE NEs) to Provider Bridge MAC BPDU frames
(MAC 0x01-80-C2-00-00-08).
1. In the MetaASSIST View, L2CP pane (on page 9-3), ensure that PEER handler is not
configured on any port for MAC 0x01-80-C2-00-00-00.
2. On L2CP pane, for MAC 0x01-80-C2-00-00-08, apply PEER handler on all ports
participating in the Provider Network and configure Drop handler on all Customer Facing
(demarcation) ports. See Configuring Handling of L2CP Frames (on page 9-3) for
more details.
3. On the Ethernet Bridge pane, click the Configure button in the STP section
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