DHCPv6 Redundancy Considerations (2014-04-05)
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This document discusses redundancy considerations for DHCPv6 and proposes three semi-redundant deployment models: split pools, multiple unique prefixes, and identical prefixes. It assumes multiple DHCPv6 servers provide addresses to the same clients without direct communication between servers. The models either use unique non-overlapping pools/prefixes or overlapping pools/prefixes with preference used to determine which server clients use. No standard redundancy protocol exists for DHCPv6 unlike DHCPv4.
DHCPv6 Redundancy Considerations (2014-04-05)
- 1. DHCPv6 Redundancy Considerations Redundancy Proposals in RFC 6853
- 2. DHCPv4 Failover 172.16.123.45 192.168.234.56 Geographically separated DHCP Servers Protocol-level Redundancy Active ---------------- Active
- 4. DHCPv6 Redundancy Considerations No Redundancy Protocol No Standards- based Failover Deployment Models RFC 6853
- 5. Assumptions 2001:db8:bc:1::547 2001:db8:bc:2::547 2+ Servers provide DHCPv6 to same Clients
- 6. Assumptions 2001:db8:bc:1::547 2001:db8:bc:2::547 DHCPv6 Servers are RFC 3315 compliant
- 7. Assumptions 2001:db8:bc:1::547 2001:db8:bc:2::547 No direct Communication DHCPv6 Replays are RFC 3315 compliant
- 9. Assumptions 2001:db8:bc:1::547 2001:db8:bc:2::547Clients have to handle Preference Option
- 10. 3 semi-redundant Deployment Models 2001:db8:bc:1::547 2001:db8:bc:2::547 Split Pools Identical Prefixes Multiple Unique Prefixes
- 11. Split Pools 2001:db8:bc:1::547 2001:db8:bc:2::547 Unique, non- overlapping Pools Simultaneously active and operational Proprietary Mechanisms Prefix = 2001:db8:bc:1::/64 Pool = 2001:db8:bc:1:0000::/65 Preference = 255 Prefix = 2001:db8:bc:1::/64 Pool = 2001:db8:bc:1:8000::/65 Preference = 0
- 12. Multiple Unique Prefixes 2001:db8:bc:1::547 2001:db8:bc:2::547 Unique, non- overlapping Prefixes Multiple Prefixes within the Network No adjacent Pools needed Prefix = 2001:db8:bc:1::/64 Pool = 2001:db8:bc:1::/64 Preference = 255 Prefix = 2001:db8:bc:5::/64 Pool = 2001:db8:bc:5::/64 Preference = 0
- 13. Identical Prefixes 2001:db8:bc:1::547 2001:db8:bc:2::547 Overlapping Prefixes and Pools Same Prefix, Length & Pool Definition Prefix = 2001:db8:bc:1::/64 Pool = 2001:db8:bc:1::/64 Preference = 255 Prefix = 2001:db8:bc:1::/64 Pool = 2001:db8:bc:1::/64 Preference = 0
- 14. To sum it up. Interim Architecture Dynamic DNS Address Conflicts Failure & Restore
- 15. Thank you for your time. Andreas Taudte Sales Engineer