Juniper JUNOSE 11.2.X BGP AND MPLS, Configuration Manual

Page: 285 / 742

echo request message. If this TLV is included in an echo response message, it is ignored.
The Echo Jitter TLV is assigned the TLV type value of 12.
P2MP Responder Identifier TLV Operations
You can select the egress node in a point-to-multipoint LSP for which you want to trace
the path from an ingress node and detect network failures by including a P2MP Responder
Identifier TLV in the echo request packet sent to the egress node. The initiator can
determine whether only the node identified in the TLV must respond or any node on the
path to the selected egress node in the TLV needs to respond. If you do not include the
P2MP Responder Identifier TLV in an echo request packet, all egress nodes in the path
to the ingress node respond to echo request packets.
If the node is an egress of the P2MP LSP, the node checks whether it has received a P2MP
Responder Identifier TLV in an echo request. If a P2MP Responder Identifier TLV is
contained in the received echo request, the node uses the sub-TLVs contained in this
TLV to determine whether it must respond to the request. If the P2MP Responder Identifier
TLV is not present (or does not contain any sub-TLVs), the egress node responds to the
echo request depending on the setting of the Response Type field in the echo message.
The P2MP Responder Identifier TLV is assigned a type number of 11. The P2MP Responder
Identifier TLV is valid only in an echo request message.
• If this TLV is included in an echo response message, it is ignored.
• If no sub-TLVs are present, this TLV is processed as though it were not included.
•
If more than one sub-TLV is present in this TLV, they are processed based on their
subtype numbers and subsequent sub-TLVs are ignored.
Four sub-TLVs are defined for inclusion in the P2MP Responder Identifier TLV in the echo
request message. Table 53 on page 249 lists the sub-TLVs supported for the P2MP
Responder Identifier TLV.
Table 53: Sub-TLVs Supported for the P2MP Responder Identifier TLV
Comments Value Subtype Number
The IPv4 address in this sub-TLV
is the IPv4 address of the egress
node and does not specify the IPv4
address of a branch or
intermediate node. IPv4 Egress Address P2MP
Responder Identifier 1
The IPv6 address in this sub-TLV
is the IPv6 address of the egress
node and does not specify the IPv6
address of a branch or
intermediate node. IPv4 Node Address P2MP
Responder Identifier 2
The IPv4 address in the sub-TLV
might be of any physical interface
or the router ID of the node itself. IPv6 Egress Address P2MP
Responder Identifier 3
249 Copyright © 2010, Juniper Networks, Inc.
Chapter 3: MPLS Overview