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OSPF Topology-Transparent Zone

Explore the simplified operation and changes to OSPF protocol with the innovative TTZ feature for smooth migration. Learn about TTZ TLV in RI LSA and how it streamlines network configurations.

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OSPF Topology-Transparent Zone

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  1. OSPF Topology-Transparent Zone Huaimo Chen (huaimochen@huawei.com) Renwei Li (renweili@huawei.com) Gregory Cauchie (greg.cauchie@gmail.com) Ning So (ning.so@tatacommunications.com) Lei Liu (liulei.kddi@gmail.com) Alvaro Retana (aretana@cisco.com)

  2. Contents • Introduction • Operation Simplified (new) • Changes to OSPF Protocol • LSA Change – I bit • TTZ TLV in RI LSA(new) • Smooth Migration to TTZ (new) • Next Step Page 2

  3. Definition of TTZ T3 T3 T2 T1 T1 T6 T5 T7 T9 T4 T4 T8 T10 T10 TTZ Removed R6 R2 R8 R3 R10 A group of TTZ edge routers • A group of routers and links connecting routers with same TTZ ID • which is virtualized as • a group of TTZ edge routers fully connected or a single router • of which routers outside TTZ are NOT aware • Links, routers inside TTZ are NOT advertised to routers outside of TTZ

  4. Operation Simplified: 1 cmd/router T3 T2 T1 T6 T5 T7 T9 T4 T8 T10 TTZ R6 Eth0/0 Eth1/0 R2 Eth0/0 Eth2/0 Eth1/0 Eth2/0 Eth3/0 R8 Eth1/0 Eth4/0 Eth4/0 Eth1/0 Eth0/0 Eth1/0 Eth3/0 Eth2/0 Eth1/0 R3 Eth2/0 R10 Eth4/0 Eth3/0 Eth0/0 Eth1/0 No configuration changes on router outside TTZ Configurations on router R2: router ip ospf 1 Interface ethernet 0/0 ip address 10.10.120.1/24 Interface ethernet 1/0 ip address 10.10.220.1/24 Configurations on router T1: router ospf 1 Interface ethernet 1/0 ip address 10.10.120.1/24 Interface ethernet 2/0 ip address 192.168.20.1/24 ttz 192.168.100.100 Configurations on router T5: router ospf 1 ttz 192.168.100.100 Interface ethernet 3/0 ip address 192.168.30.1/24 Configure TTZ ID on one interface in TTZ for edge Configure TTZ ID on internal TTZ router Will Simplify It More

  5. Contents • Introduction • Operation Simplified (new) • Changes to OSPF Protocol • LSA Change – I bit • TTZ TLV in RI LSA(new) • Smooth Migration to TTZ (new) • Next Step Page 5

  6. LSA Change — I bit 1 bit to identify if a link is in TTZ Router LSA 0 1 2 7 LS Age Options LS Type = 1 Link Type Link State ID Header Advertising Router LS Sequence Number LS Checksum Length Flags Number of Links 0 1 2 7 I bit = 1 if link in TTZ Router Link Link Type I . . . . . . I bit = 1 if link in TTZ Router Link I = 1: Link is in TTZ I = 0: Link is not in TTZ Meaning of “Link Type” of 7 bits is the same as that of “Link Type” of 8 bits. Page 6

  7. Router LSA Generated by T1/T5 to inside TTZ T3 T2 T1 T6 T5 T7 T9 T4 T8 T10 TTZ R6 R1 R2 R7 R8 R9 R3 R10 R4 R11 R5 LS Age Options LS Type = 1 LS Age Options LS Type = 1 Header Header Link State ID (T1) Link State ID (T5) Advertising Router (T1) Advertising Router (T5) LS Sequence Number LS Sequence Number Length Length LS Checksum LS Checksum Flags Number of Links Flags Number of Links I=0 for Normal Link I=1 for TTZ Link Router Link: T1 to R2 Router Link: T5 to T1 I=1 for TTZ link I=1 for TTZ link Router Link: T1 to T2 Router Link: T5 to T4 I=1 for TTZ link I=1 for TTZ link Router Link: T1 to T4 Router Link: T5 to T6 I=1 for TTZ link I=1 for TTZ link Router Link: T1 to T5 Router Link: T5 to T9

  8. Router LSA by T1 for Virtualizing TTZ T3 T1 T4 T10 R6 R1 R2 R7 R8 R9 R3 R10 R4 R11 R5 LS Age Options LS Type = 1 Link State ID (T1) Header Advertising Router (T1) LS Sequence Number LS Checksum Length Flags Number of Links Normal Link Router Link: T1 to R2 Normal Link (“virtual”) Router Link: T1 to T3 Router Link: T1 to T4 Normal Link (“virtual”) Router Link: T1 to T10 Page 8

  9. Contents • Introduction • Operation Simplified (new) • Changes to OSPF Protocol • LSA Change – I bit • TTZ TLV in RI LSA (new) • Smooth Migration to TTZ (new) • Next Step Page 9

  10. TTZ TLV in RI LSA TLV for Info of TTZ router OSPFv2 Router Information LSA 0 1 3 0 1 5 0 1 LS Age Options LS Type = 10 Type Length 4 0 Header Advertising Router E LS Sequence Number LS Checksum Length TTZ ID TLVs . . . . . . E = 1: Edge router of TTZ E = 0: Internal router of TTZ TTZ ID: ID of TTZ to which router belongs TTZ: all routers with same TTZ ID and all TTZ links. For TTZ edge router, its links connected to other TTZ routers are TTZ links. For TTZ Internal router, all its links are TTZ links. Page 10

  11. RI LSA Generated by T1/T5 T3 T2 T1 T6 T5 T7 T9 T4 T8 T10 TTZ 100 R6 R1 R2 R7 R8 R9 R3 R10 R4 R11 R5 LS Age Options LS Type = 10 LS Age Options LS Type = 10 Header Header 4 0 4 0 Advertising Router (T1) Advertising Router (T5) LS Sequence Number LS Sequence Number Length Length LS Checksum LS Checksum TTZ TLV TTZ TLV E=1 E=0 TTZ ID = 100 TTZ ID = 100 E=1 for Edge of TTZ E=0 for Internal router of TTZ

  12. Router LSA by T1 for Virtualizing TTZ (Same) T3 T1 T4 T10 R6 R1 R2 R7 R8 R9 R3 R10 R4 R11 R5 LS Age Options LS Type = 1 Link State ID (T1) Header Advertising Router (T1) LS Sequence Number LS Checksum Length Flags Number of Links Normal Link Router Link: T1 to R2 Normal Link (“virtual”) Router Link: T1 to T3 Router Link: T1 to T4 Normal Link (“virtual”) Router Link: T1 to T10 Page 12

  13. Contents • Introduction • Operation Simplified (new) • Changes to OSPF Protocol • LSA Change – I bit • TTZ TLV in RI LSA (new) • Smooth Migration to TTZ (new) • Next Step Page 13

  14. Smooth Migration to TTZ T3 T2 T1 T6 T7 T5 T9 T4 T8 T10 TTZ TTZ link states “viewed” after configure TTZ (LSA with TTZ TLV or LSA with I bit generated and distributed) Normal link 2. Allow it to TTZ after it has a complete TTZ topology as configured TTZ link Normal links R6 R1 R2 R7 R8 R3 R9 R4 R10 R5 R11 3. Activate TTZ after all routers in TTZ are allowed to TTZ. (Generate and distribute LSA for virtualizing TTZ. Transfer to TTZ) Generate and distribute LSA for virtualizing TTZ after receiving LSA. Transfer to TTZ. Migration to TTZ with minimum interruption Configure TTZ: routers in TTZ work as normal and prepare for TTZ Allow router to TTZ after it is ready for TTZ Activate TTZ: all routers in TTZ transfer to work as TTZ routers in ms Page 14

  15. Next Step • Welcome comments

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