Nokia 7705 SAR-W Series Manual page 384

Label Distribution Protocol
When the unnumbered interface is added into LDP, the follow behavior occurs.
For link LDP (L-LDP) sessions:
For targeted LDP (T-LDP) sessions:
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1. The Hello adjacency is brought up using a link Hello packet with the source IP
address set to the interface borrowed IP address and a destination IP address
set to 224.0.0.2.
2. Hello packets with the same source IP address should be accepted when
received over parallel unnumbered interfaces from the same peer LSR ID. The
corresponding Hello adjacencies are associated with a single LDP session.
3. The transport address for the TCP connection, which is encoded in the Hello
packet, is always set to the LSR ID of the node whether or not the interface
option was enabled using the config>router>ldp>interface-parameters>
interface>transport-address command.
4. The local-lsr-id option can be configured on the interface and the value of the
LSR ID can be changed to either the local interface or to some other interface
name. If the local interface is selected or the provided interface name
corresponds to an unnumbered IP interface, the unnumbered interface
borrowed IP address is used as the LSR ID. In all cases, the transport address
for the LDP session is updated to the new LSR ID value, but the link Hello
packets continue to use the interface borrowed IP address as the source IP
address.
5. The LSR with the highest transport address, the LSR ID in this case, bootstraps
the TCP connection and LDP session.
6. The source and destination IP addresses of LDP packets are the transport
addresses, that is, the LDP LSR IDs of the LSRs at the endpoints of the link (A
and B in the example).
1. The source and destination addresses of the targeted Hello packet are the LDP
LSR IDs of systems A and B.
2. The local-lsr-id option can be configured on the interface for the targeted
session and the value of the LSR ID can be changed to either the local interface
or to some other interface name. If the local interface is selected or the provided
interface name corresponds to an unnumbered IP interface, the unnumbered
interface borrowed IP address is used as the LSR ID. In all cases, the transport
address for the LDP session and the source IP address of the targeted Hello
message are updated to the new LSR ID value.
3. The LSR with the highest transport address, the LSR ID in this case, bootstraps
the TCP connection and LDP session.
4. The source and destination IP addresses of LDP packets are the transport
addresses, that is, the LDP LSR IDs of the LSRs at the endpoints of the link (A
and B in the example).
Use subject to Terms available at: www.nokia.com
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MPLS Guide
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