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Contents
Ø Smooth Migration to TTZ (new) Ø Changes to OSPF Protocol Ø Introduction Ø Next Step § LSA Change – I bit § TTZ TLV in RI LSA (new) Ø Operation Simplified (new)
OSPF Topology-Transparent Zone Huaimo Chen - - PowerPoint PPT Presentation
OSPF Topology-Transparent Zone Huaimo Chen - - PowerPoint PPT Presentation
OSPF Topology-Transparent Zone Huaimo Chen (huaimochen@huawei.com) Renwei Li (renweili@huawei.com) Gregory Cauchie (greg.cauchie@gmail.com) Ning So
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A group of routers and links connecting routers with same TTZ ID
Ø which is virtualized as
- a group of TTZ edge routers fully connected or a single router
Ø of which routers outside TTZ are NOT aware Links, routers inside TTZ are NOT advertised to routers outside of TTZ
R6 R8 R10 R2 R3
T4 T2 T5 T8 T3 T9 T10 T1 T7 T6
TTZ
T4 T3 T10 T1
Definition of TTZ
Removed A group of TTZ edge routers
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Operation Simplified: 1 cmd/router
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
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
Configure TTZ ID on one interface in TTZ for edge
R6 R8 R10 R2 R3
T4 T2 T5 T8 T3 T9 T10 T1 T7 T6
TTZ
Configure TTZ ID on internal TTZ router
Eth0/0 Eth1/0 Eth1/0 Eth4/0 Eth3/0 Eth2/0
Eth1/0 Eth2/0 Eth3/0 Eth4/0
Eth0/0 Eth1/0 Eth1/0 Eth2/0 Eth3/0 Eth4/0 Eth2/0 Eth0/0 Eth1/0 Eth1/0 Eth0/0
Will Simplify It More
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Contents
Ø Smooth Migration to TTZ (new) Ø Changes to OSPF Protocol Ø Introduction Ø Next Step § LSA Change – I bit § TTZ TLV in RI LSA (new) Ø Operation Simplified (new)
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LSA Change — I bit
1 bit to identify if a link is in TTZ
1 2 7
I Link Type
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.
1 2 7
Link Type
Options LS Age Link State ID LS Sequence Number LS Checksum Advertising Router Length Number of Links I bit = 1 if link in TTZ LS Type = 1 Router Link Router Link . . . . . . Flags Header I bit = 1 if link in TTZ
Router LSA
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Router LSA Generated by T1/T5 to inside TTZ
R6 R7 R8 R10 R9 R4 R1 R2
R11
R3 R5
T4 T2 T5 T8 T3 T9 T10 T1 T7 T6
TTZ
Options LS Age Link State ID (T1) LS Sequence Number LS Checksum Advertising Router (T1) Length Number of Links I=0 for Normal Link LS Type = 1 Router Link: T1 to R2 Router Link: T1 to T5 Flags Header Router Link: T1 to T2 Router Link: T1 to T4 I=1 for TTZ link I=1 for TTZ link I=1 for TTZ link Options LS Age Link State ID (T5) LS Sequence Number LS Checksum Advertising Router (T5) Length Number of Links I=1 for TTZ Link LS Type = 1 Router Link: T5 to T1 Router Link: T5 to T9 Flags Header Router Link: T5 to T4 Router Link: T5 to T6 I=1 for TTZ link I=1 for TTZ link I=1 for TTZ link
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Router LSA by T1 for Virtualizing TTZ
R6 R7 R8 R10 R9 R4 R1 R2
R11
R3 R5
T4 T3 T10 T1 Options LS Age Link State ID (T1) LS Sequence Number LS Checksum Advertising Router (T1) Length Number of Links Normal Link LS Type = 1 Router Link: T1 to R2 Router Link: T1 to T10 Flags Header Router Link: T1 to T3 Router Link: T1 to T4 Normal Link (“virtual”) Normal Link (“virtual”)
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Page 9
Contents
Ø Smooth Migration to TTZ (new) Ø Changes to OSPF Protocol Ø Introduction Ø Next Step § LSA Change – I bit § TTZ TLV in RI LSA (new) Ø Operation Simplified (new)
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TTZ TLV in RI LSA
TLV for Info of TTZ router
1 3 TTZ ID
E Length
E = 1: Edge router of TTZ E = 0: Internal router of TTZ
TTZ ID: ID of TTZ to which router belongs
1 5
Type
Options LS Age 4 LS Sequence Number LS Checksum Advertising Router Length LS Type = 10 . . . . . . TLVs Header
OSPFv2 Router Information LSA 1
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.
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RI LSA Generated by T1/T5
R6 R7 R8 R10 R9 R4 R1 R2
R11
R3 R5
T4 T2 T5 T8 T3 T9 T10 T1 T7 T6
TTZ 100
Options LS Age 4 LS Sequence Number LS Checksum Advertising Router (T1) Length LS Type = 10 Header TTZ ID = 100 E=1 for Edge of TTZ Options LS Age LS Sequence Number LS Checksum Advertising Router (T5) Length LS Type = 10 Header 4 TTZ TLV
E=1
TTZ ID = 100 E=0 for Internal router of TTZ TTZ TLV
E=0
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Router LSA by T1 for Virtualizing TTZ (Same)
R6 R7 R8 R10 R9 R4 R1 R2
R11
R3 R5
T4 T3 T10 T1 Options LS Age Link State ID (T1) LS Sequence Number LS Checksum Advertising Router (T1) Length Number of Links Normal Link LS Type = 1 Router Link: T1 to R2 Router Link: T1 to T10 Flags Header Router Link: T1 to T3 Router Link: T1 to T4 Normal Link (“virtual”) Normal Link (“virtual”)
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Contents
Ø Smooth Migration to TTZ (new) Ø Changes to OSPF Protocol Ø Introduction Ø Next Step § LSA Change – I bit § TTZ TLV in RI LSA (new) Ø Operation Simplified (new)
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Smooth Migration to TTZ
Migration to TTZ with minimum interruption
1. Configure TTZ: routers in TTZ work as normal and prepare for TTZ 2. Allow router to TTZ after it is ready for TTZ 3. Activate TTZ: all routers in TTZ transfer to work as TTZ routers in ms
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R6 R7 R8 R10 R9 R4 R1 R2
R11
R3 R5
T4 T2 T5 T8 T3 T9 T10 T1 T7 T6
TTZ
Normal links TTZ link states “viewed” after configure TTZ (LSA with TTZ TLV or LSA with I bit generated and distributed)
- 2. Allow it to TTZ after it
has a complete TTZ topology as configured
- 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. Normal link TTZ link
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