IS-IS and OSPF: Network Design Comparisons and ... - JANOG

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Extensibility • OSPF • New extensions require new LSAs (usually) • All routers must understand new LSAs (usually) • IPv6 support will require new OSPF version • IS-IS • New extensions require new TLVs (usually) • Fewer compatibility issues than OSPF • Small community of interest (big ISPs) with big vendor clout means faster rollout of extensions • Extendable for IPv6
Optimality • Optimality • OSPF was optimized for things that don’t matter any more (link bandwidth, CPU alignment) • IS-IS was optimized for things that don’t matter any more (large LANs, SPF cost) • Optimizations turn out to add complexity, but not much value • A lot has changed in 10 years
Page 1 and 2:
IS-IS and OSPF: Network Design Comp
Page 3 and 4:
Agenda • Overview of link-state p
Page 5 and 6:
In the Beginning Was Distance Vecto
Page 7 and 8:
Problems with Distance Vector • S
Page 9 and 10:
Fundamental Link-state Concepts •
Page 11 and 12:
SPF Calculation Example Link-state
Page 13 and 14: SPF Calculation Example Link-state
Page 15 and 16: SPF Calculation Example Link-state
Page 17 and 18: Problems with Link State • Inform
Page 19 and 20: In the Beginning Was DECnet... •
Page 21 and 22: Protocol History • (Disclaimer—
Page 23 and 24: Protocol History • 1991 • OSPF
Page 25 and 26: Protocol History • 1996-1998 •
Page 27 and 28: ISOspeak 101 • Intermediate Syste
Page 29 and 30: Message Types: IS-IS • Hello PDU
Page 31 and 32: IS-IS Level 1 LSPs • Single LSP,
Page 33 and 34: Message Encoding: OSPF • Runs ove
Page 35 and 36: Media Support • OSPF • Broadcas
Page 37 and 38: Router and Area IDs: IS-IS 1-13 byt
Page 39 and 40: Neighbor Discovery and Maintenance:
Page 41 and 42: Database Synchronization: IS-IS •
Page 43 and 44: Database Refresh: IS-IS • LSP ref
Page 45 and 46: Designated Routers (DIS): IS-IS •
Page 47 and 48: Area Structure: IS-IS • Area boun
Page 49 and 50: Agenda • Overview of link-state p
Page 51 and 52: Metrics: IS-IS • Dimensionless me
Page 53 and 54: LSP Scalability: IS-IS • Single L
Page 55 and 56: IS-IS Inter-Area Route Leaking •
Page 57 and 58: NBMA Networks • OSPF • Point-to
Page 59 and 60: Overload Bit • IS-IS feature •
Page 61 and 62: Security • Both protocols support
Page 63: Agenda • Overview of link-state p
Page 67 and 68: Writing OSPF Code • OSPF spec is
Page 69 and 70: Agenda • Overview of link-state p
Page 71: Thank You http://www.juniper.net
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IS-IS and OSPF: Network Design Comparisons and ... - JANOG

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