Cisco ASR 9000 Series Routing Configuration Guide

The range for maximum paths is from 1 to 8 and the default number of maximum paths is 8.
Multi-Area Adjacency for OSPF Version 2
The multi-area adjacency feature for OSPFv2 allows a link to be configured on the primary interface in more
than one area so that the link could be considered as an intra-area link in those areas and configured as a
preference over more expensive paths.
This feature establishes a point-to-point unnumbered link in an OSPF area. A point-to-point link provides a
topological path for that area, and the primary adjacency uses the link to advertise the link consistent with
draft-ietf-ospf-multi-area-adj-06.
The following are multi-area interface attributes and limitations:
•
Exists as a logical construct over an existing primary interface for OSPF; however, the neighbor state
on the primary interface is independent of the multi-area interface.
•
Establishes a neighbor relationship with the corresponding multi-area interface on the neighboring router.
A mixture of multi-area and primary interfaces is not supported.
•
Advertises an unnumbered point-to-point link in the router link state advertisement (LSA) for the
corresponding area when the neighbor state is full.
•
Created as a point-to-point network type. You can configure multi-area adjacency on any interface where
only two OSF speakers are attached. In the case of native broadcast networks, the interface must be
configured as an OPSF point-to-point type using the network point-to-point command to enable the
interface for a multi-area adjacency.
•
Inherits the Bidirectional Forwarding Detection (BFD) characteristics from its primary interface. BFD
is not configurable under a multi-area interface; however, it is configurable under the primary interface.
The multi-area interface inherits the interface characteristics from its primary interface, but some interface
characteristics can be configured under the multi-area interface configuration mode as shown below:
RP/0/RSP0/CPU0:router(config-ospf-ar)# multi-area-interface GigabitEthernet 0/1/0/3
RP/0/RSP0/CPU0:router(config-ospf-ar-mif)# ?
authentication Enable authentication
authentication-key Authentication password (key)
cost Interface cost
cost-fallback Cost when cumulative bandwidth goes below the theshold
database-filter Filter OSPF LSA during synchronization and flooding
dead-interval Interval after which a neighbor is declared dead
distribute-list Filter networks in routing updates
hello-interval Time between HELLO packets
message-digest-key Message digest authentication password (key)
mtu-ignore Enable/Disable ignoring of MTU in DBD packets
packet-size Customize size of OSPF packets upto MTU
retransmit-interval Time between retransmitting lost link state advertisements
transmit-delay Estimated time needed to send link-state update packet
RP/0/RSP0/CPU0:router(config-ospf-ar-mif)#
Label Distribution Protocol IGP Auto-configuration for OSPF
Label Distribution Protocol (LDP) Interior Gateway Protocol (IGP) auto-configuration simplifies the procedure
to enable LDP on a set of interfaces used by an IGP instance, such as OSPF. LDP IGP auto-configuration can
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
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Implementing OSPF
Multi-Area Adjacency for OSPF Version 2

Cisco ASR 9000 Series Specifications

General

Series	ASR 9000
Category	Network Router
Modular Design	Yes
Redundancy	Yes (Hardware and Software)
Operating System	Cisco IOS XR
Interfaces/Ports	10G, 40G, 100G, 400G Ethernet
Expansion Slots	Varies by model
Routing Protocol	BGP, OSPF, IS-IS, EIGRP
Management	CLI, SNMP, NETCONF
Power Supply	Redundant
Port Density	Varies by model
Power Supply Options	AC, DC
Memory	Varies by model
Storage	Varies by model
Dimensions	Varies by model
Weight	Varies by model