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Title : OSPFv2 Extensions for Link Capabilities and IP/LDP
Local Protection
Author(s) : A. Atlas
Filename : draft-atlas-ospf-local-protect-cap-00.txt
Pages : 7
Date : 2004-2-9
This document proposes an extension to OSPF Version 2 for advertising
link capabilities using the extensions defined for traffic engineering.
The link capabilities are defined there for future extensibility.
To support the signaling requirements of IP Local Protection [IP-
LOCAL-PROTECT], this document defines two bits in the proposed link
capabilities extension. Additionally, this document reserves a bit in
the Router Capabilities TLV defined in [OSPF-RTR-CAP].
This document specifies additional information that can inserted in
OSPF LSAs to convey link capabilities that may be useful in certain
applications. In particular, a router may indicate that zero or more
of its links may be used by an upstream router as an alternate, SPT-
disjoint path to an arbitrary destination D. Additionally, a router
may convey that zero or more of its links are capable of breaking a
U-turn, which may be described as a single-hop forwarding loop
between two router's. This means that a router can detect the
presence of a forwarding loop by recognizing that traffic to a
destination is being received from a neighbor to which it has
forwarding state pointing back to the same neighbor for that
destination. In such a situation, it will switch to a loop-free
node-protecting alternate until new primary forwarding state has been
installed, thus breaking the U-turn. Therefore, the immediate
applicability for these two link capabilities is in support of local
protection in the event of a link and/or node failure while the OSPF
area is reconverging onto a new topology.
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