OSPFv3 (for IPv6) introduces significant changescompared toOSPFv2 (for IPv4).
While both versions share similarrouting mechanisms, there are keyLSA format and functional differencesbeyond just address changes.
Major Differences Between OSPFv2 and OSPFv3:
Address Independence (LSA Format Changes)
OSPFv3 LSAs do not contain IP addresses directly; they rely onLink-LSA and Intra-Area Prefix LSAto advertise addresses.
InOSPFv2, IP addresses were included in LSA headers.
New LSA Types in OSPFv3
LSA Type 8 (Link-LSA): Advertises a router’s IPv6 address to neighbors.
LSA Type 9 (Intra-Area Prefix LSA): Replaces the address information in Router-LSAs and Network-LSAs.
Support for Multiple Address Families (AF)
OSPFv3 can supportboth IPv4 and IPv6in newer implementations (RFC 5838).
Authentication Mechanism Removed
OSPFv3 relies on IPsec for authentication, whereas OSPFv2 hadbuilt-in authentication mechanisms.
Incorrect Statement Explanation:
❌The statement"LSA formats and functions remain unchanged"isfalsebecause:
LSA structures were modifiedin OSPFv3.
New LSA types were introducedto handle IPv6 addresses separately.
Reference from Huawei HCIE-Datacom Documentation:
Huawei OSPFv3 Configuration Guide – LSA Differences from OSPFv2
HCIE-Datacom Study Material – OSPFv3 Evolution & IPv6 Implementation
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