Cpe Ping; Mac Populate - Alcatel-Lucent 7750 SR OS Service Manual

OAM Overview
When a traceroute request is sent via the data plane, the data plane format is used. The reply can be
via the data plane or the control plane.
A data plane MAC traceroute request includes the tunnel encapsulation, the VC label, and the
OAM, followed by an Ethernet DLC, a UDP and IP header. If the mapping for the MAC address is
known at the sender, then the data plane request is sent down the known SDP with the appropriate
tunnel encapsulation and VC label. If it is not known, then it is sent down every SDP (with the
appropriate tunnel encapsulation per SDP and appropriate egress VC label per SDP binding).
The tunnel encapsulation TTL is set to 255. The VC label TTL is initially set to the min-ttl (default
is 1). The OAM label TTL is set to 2. The destination IP address is the all-routers multicast
address. The source IP address is the system IP of the sender.
The destination UDP port is the LSP ping port. The source UDP port is whatever the system gives
(note that this source UDP port is really the demultiplexor that identifies the particular instance
that sent the request, when correlating the reply).
The Reply Mode is either 3 (i.e., reply via the control plane) or 4 (i.e., reply through the data
plane), depending on the reply-control option. By default, the data plane request is sent with Reply
Mode 3 (control plane reply).
The Ethernet DLC header source MAC address is set to either the system MAC address (if no
source MAC is specified) or to the specified source MAC. The destination MAC address is set to
the specified destination MAC. The EtherType is set to IP.

CPE Ping

The MAC ping OAM tool makes it possible to detect whether a particular MAC address has been
learned in a VPLS.
The cpe-ping command extends this capability to detecting end-station IP addresses inside a
VPLS. A CPE ping for a specific destination IP address within a VPLS will be translated to a
MAC-ping towards a broadcast MAC address. Upon receiving such a MAC ping, each peer PE
within the VPLS context will trigger an ARP request for the specific IP address. The PE receiving
a response to this ARP request will report back to the requesting 7750 SR.

MAC Populate

MAC Populate is used to send a message through the flooding domain to learn a MAC address as
if a customer packet with that source MAC address had flooded the domain from that ingress point
in the service. This allows the provider to craft a learning history and engineer packets in a
particular way to test forwarding plane correctness.
The MAC populate request is sent with a VC TTL of 1, which means that it is received at the
forwarding plane at the first hop and passed directly up to the management plane. The packet is
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