Ospf Ip Fast Reroute Loop Free Alternate; Management Information Base (Mib) For Ospfv3 - Cisco ASR 9000 Series Routing Configuration Manual

Implementing OSPF
PCE is accomplished when a PCE address and client is configured for MPLS-TE. PCE communicates its PCE
address and capabilities to OSPF then OSPF packages this information in the PCE Discovery type-length-value
(TLV) (Type 2) and reoriginates the RI LSA. OSPF also includes the Router Capabilities TLV (Type 1) in
all its RI LSAs. The PCE Discovery TLV contains the PCE address sub-TLV (Type 1) and the Path Scope
Sub-TLV (Type 2).
The PCE Address Sub-TLV specifies the IP address that must be used to reach the PCE. It should be a
loop-back address that is always reachable, this TLV is mandatory, and must be present within the PCE
Discovery TLV. The Path Scope Sub-TLV indicates the PCE path computation scopes, which refers to the
PCE ability to compute or participate in the computation of intra-area, inter-area, inter-AS or inter-layer TE
LSPs.
PCE extensions to OSPFv2 include support for the Router Information Link State Advertisement (RI LSA).
OSPFv2 is extended to receive all area scopes (LSA Types 9, 10, and 11). However, OSPFv2 originates only
area scope Type 10.
For detailed information for the Path Computation Element feature see the Implementing MPLS Traffic
Engineering on Cisco ASR 9000 Series Router module of the Cisco ASR 9000 Series Aggregation Services
Router MPLS Configuration Guide and the following IETF drafts:
• draft-ietf-ospf-cap-09
• draft-ietf-pce-disco-proto-ospf-00

OSPF IP Fast Reroute Loop Free Alternate

The OSPF IP Fast Reroute (FRR) Loop Free Alternate (LFA) computation supports these:
• Fast rerouting capability by using IP forwarding and routing
• Handles failure in the line cards in minimum time
• Supports OSPFv2 and OSPFv3 IP FRR functionality in non-default VRFs.

Management Information Base (MIB) for OSPFv3

Cisco IOS XR supports full MIBs and traps for OSPFv3, as defined in RFC 5643. The RFC 5643 defines
objects of the Management Information Base (MIB) for use with the Open Shortest Path First (OSPF) Routing
Protocol for IPv6 ( OSPF version 3).
The OSPFv3 MIB implementation is based on the IETF draft Management Information Base for OSPFv3 (
draft-ietf-ospf-ospfv3-mib-8). Users need to update the NMS application to pick up the new MIB when
upgraded to RFC 5643.
Refer to the Cisco ASR 9000 Series Aggregation Services Router MIB Specification Guide for more information
on Cisco IOS XR MIB support.
Multiple OSPFv3 Instances
SNMPv3 supports "contexts" that can be used to implement MIB views on multiple OSPFv3 instances, in the
same system.
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