Targeted Ldp - Alcatel-Lucent 7450 Manual

Targeted LDP

Hello adjacency will be brought up using link Hello packet with source IP address set to the
interface link-local unicast address and a destination IP address set to the link-local multicast
address FF02:0:0:0:0:0:0:2.
The transport address for the TCP connection, which is encoded in the Hello packet, will be set to
the LSR-ID of the LSR by default. It will be set to the interface IPv6 address if the user enabled
the interface option under one of the following contexts:
•
•
Note that the interface global unicast address, meaning the primary IPv6 unicast address of the
interface, is used.
The user can configure the local-lsr-id option on the interface and change the value of the LSR-ID
to either the local interface or to another interface name, loopback or not. The global unicast IPv6
address corresponding to the primary IPv6 address of the interface is used as the LSR-ID. If the
user invokes an interface which does not have a global unicast IPv6 address in the configuration of
the transport address or the configuration of the local-lsr-id option, the session will not come up
and an error message will be displayed.
The LSR with the highest transport address will bootstrap the IPv6 TCP connection and IPv6 LDP
session.
Source and destination addresses of LDP/TCP session packets are the IPv6 transport addresses.
Targeted LDP
Source and destination addresses of targeted Hello packet are the LDP IPv6 LSR-IDs of systems A
and B.
The user can configure the local-lsr-id option on the targeted session and change the value of the
LSR-ID to either the local interface or to some other interface name, loopback or not. The global
unicast IPv6 address corresponding to the primary IPv6 address of the interface is used as the
LSR-ID. If the user invokes an interface which does not have a global unicast IPv6 address in the
configuration of the transport address or the configuration of the local-lsr-id option, the session
will not come up and an error message will be displayed. In all cases, the transport address for the
LDP session and the source IP address of targeted Hello message will be updated to the new LSR-
ID value.
The LSR with the highest transport address (in this case, the LSR-ID) will bootstrap the IPv6 TCP
connection and IPv6 LDP session.
Source and destination IP addresses of LDP/TCP session packets are the IPv6 transport addresses
(in this case, LDP LSR-IDs of systems A and B).
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7450 ESS MPLS Guide