Chapter 16: Dynamic Routing Protocols
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 511
LSA generated by the ASBR within an NSSA. This LSA includes the link cost to an external autonomous
system destination. Type-7 LSAs are flooded only within the local NSSA.
LSA sent by every router, using a link-local flooding. This LSA includes the link-local address and IPv6
prefixes for this link.
LSA sent by every router. This LSA includes any prefix or link state changes within an area. Intra-Area
Prefix LSAs are flooded to the local OSPFv3 area. This LSA does not trigger an SPF recalculation.
Link Cost
Each OSPFv3 interface is assigned a link cost. The link cost is:
An arbitrary number. By default, the C4/c CMTS assigns a cost of one to each interface.
Configurable by the user.
Carried in the LSA updates for each link.
Displaying Cost of Route
The cost of the route is the sum of the interface costs which can be displayed by the following command:
show ipv6 route
Flooding
OSPFv3 floods LSA updates to different sections of the network depending on the LSA type. OSPFv3 uses the following
flooding scopes:
Link-local — LSA is flooded only on the local link, and no further. Used for Link LSAs and Grace LSAs.
Area-local — LSA is flooded throughout a single OSPF area only. Used for Router LSAs, Network LSAs, Inter-Area-Prefix
LSAs, Inter-Area-Router LSAs, and Intra-Area-Prefix LSAs.
AS scope — LSA is flooded throughout the routing domain. Used for AS External LSAs.
LSA flooding guarantees that all routers in the network have identical routing information. LSA flooding depends on the
OSPFv3 area configuration. The LSAs are flooded based on the link-state refresh time (every 30 minutes by default). Each
LSA has its own link-state refresh time.
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