Chapter 16: Dynamic Routing Protocols
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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All other routers establish adjacency with the DR and the BDR and use the IPv6 multicast address FF02::6 and MAC address
33:33:00:00:00:06 to send LSA updates to the DR and BDR.
Designated Router Configuration
It is recommended that the following command is issued on each interface with an OSPFv3 broadcast network type. By
setting the priority to 0, as shown in the example, the C4/c CMTS will not participate in DR elections:
configure interface gigabitethernet <slot>/<port> ipv6 ospf priority 0
Note: ARRIS recommends that the C4/c CMTS not be configured as a designated router by means of this command.
Areas
An area is a logical division of routers and links within an OSPFv3 domain that creates separate subdomains. By dividing an
OSPFv3 network into areas and limiting the numbers of LSAs per area, the CPU and memory requirements can be reduced.
LSA Flooding
LSA flooding is contained within an area, and the link-state database is limited to links within the area.
Area ID
You can assign an area ID to the interfaces within the defined area. The area ID is a 32-bit value that can be expressed as a
number or in a dotted decimal notation, such as 10.2.3.1.
Backbone Area
If you define more than one area in an OSPFv3 network, you must also define the backbone area, which has the reserved
area ID of 0. The backbone area sends summarized information about one area to another area.
Area Border Routers
If you have more than one area, then one or more routers become Area Border Routers (ABRs). An ABR connects to both
the backbone area and at least one other defined area.