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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Best Choice Route
The C4/c CMTS bases its choice of best route based on the following order of criteria:
1.
Longest prefix
2.
Administrative Distance based on route type (for example, connected, static, ISIS, BGP)
3.
Route cost.
Neighbors
An OSPFv3 interface must have a compatible configuration with a remote interface before the two can be considered
neighbors.
Compatibility Match
The two OSPFv3 interfaces must match the following criteria:
Hello interval
Dead interval
Area ID
Authentication
Instance ID
Optional capabilities
If there is a match, the following information is entered into the neighbor table:
Neighbor ID — The router ID of the neighbor router.
Priority — Priority of the neighbor router. The priority is used for designated router.
State — Indication of whether the neighbor has just been heard from, is in the process of setting up bidirectional
communications, is sharing the link-state information, or has achieved full adjacency.
Dead Time — Indication of how long since the last Hello packet was received from this neighbor.
Link-local IPv6 Address — The link-local IPv6 address of the neighbor.
Designated Router — Indication of whether the neighbor has been declared the designated router or backup
designated router.
Local Interface — The local interface that received the Hello packet for this neighbor.
