Targeted Ldp; Fec Resolution - Nokia 7705 SAR-W Series Manual

Label Distribution Protocol

5.4.2 Targeted LDP

The source and destination addresses of targeted Hello packets are the LDP IPv6
LSR- IDs of systems A and B in
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,
including 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 that 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 does not
come up and an error message is displayed. In all cases, the transport address for
the LDP session and the source IP address of targeted Hello messages are updated
with 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.
The source and destination IP addresses of LDP/TCP session packets are the IPv6
transport addresses the LDP LSR IDs of systems A and B in

5.4.3 FEC Resolution

LDP advertises and withdraws all interface IPv6 addresses using the Address/
Address-Withdraw message. Both the link local unicast address and the configured
global unicast addresses of an interface are advertised.
Like LDP IPv4 sessions, LDP FEC types can be exchanged over an LDP IPv6
session. The LSR does not advertise a FEC for a link local address and, if received,
the LSR will not resolve it.
An IPv4 or IPv6 prefix FEC can be resolved to an LDP IPv6 interface in the same
way it is resolved to an LDP IPv4 interface. The outgoing interface and next hop are
looked up in the RTM cache. The next hop can be the link local unicast address of
the other side of the link or a global unicast address. The FEC is resolved to the LDP
IPv6 interface of the downstream LDP IPv6 LSR that advertised the IPv4 or IPv6
address of the next hop.
A PW FEC can be resolved to a targeted LDP IPv6 adjacency with an LDP IPv6 LSR
if there is a context for the FEC with local spoke SDP configuration or spoke SDP
auto-creation from a service such as BGP-AD VPLS, BGP-VPWS, or dynamic MS-
PW.
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Figure
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Use subject to Terms available at: www.nokia.com
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MPLS Guide
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