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JunosE 11.3.x IP, IPv6, and IGP Configuration Guide
Opaque LSAs
Route Leakage
Equal-Cost Multipath
OSPF MIB
Interacting with Other Routing Protocols
242
OSPF opaque LSAs provide a generalized way of extending OSPF. The router generates
opaque LSAs to carry traffic engineering information, accepts them from other routers,
and floods them accordingly. OSPF uses the traffic engineering information to build a
database from which paths can be computed for MPLS label-switched paths.
Routes can be leaked into OSPF or from OSPF as follows:
Route leakage into OSPF—When another routing protocol adds a new route to the
routing table, or when a static route is added to the routing table, OSPF can be informed
through the redistribute commands. When OSPF learns the new route, it floods the
information into the routing domain by using external LSAs.
Route leakage from OSPF—OSPF adds routing information to the routing table, which
is used in forwarding IP packets.
OSPF inherently supports equal-cost multipath (ECMP). When building the shortest-path
tree, OSPF calculates all paths of equal cost to a given destination. If equal-cost paths
exist, OSPF inserts into the routing table the next hops for all equal-cost paths to a
destination.
See the compressed software image bundle that you downloaded from the Juniper
Networks website for complete information about the OSPF Management Information
Base (MIB) supported by your router. The MIBs folder contains information about all
supported standard and Juniper Networks E Series enterprise (proprietary) MIBs. OSPF
does not act as a host within the router and therefore does not support the ospfIfMetric
and ospfHost tables.
OSPF interacts seamlessly with the following routing protocols:
IS-IS—OSPF was developed originally from an early version of the IS-IS intradomain
routing protocol. OSPF can import IS-IS routing information. See "Configuring IS-IS"
on page 317.
RIP—E Series routers can simultaneously run OSPF and RIP. When doing so, OSPF
routes are preferred over RIP. In general, use of the OSPF protocol is preferred because
of its robustness, responsiveness, and decreased bandwidth requirements. See
"Configuring RIP" on page 201.
BGP—The default expectation is that your routing environment is an AS running OSPF
and exchanging BGP routes with other ASs. See JunosE BGP and MPLS Configuration
Guide.
Copyright © 2010, Juniper Networks, Inc.
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