Page 3 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 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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E = 1: Edge router of TTZE = 0: Internal router of TTZTTZ ID: ID of TTZ to which router belongs
0 1 5 0Type
OptionsLS Age
4
LS Sequence Number
LS Checksum
Advertising Router
Length
LS Type = 10
. . . . . .
TLVs
Header
OSPFv2 Router Information LSA1
0
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.
RI LSA Generated by T1/T5RI 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
OptionsLS Age
4
LS Sequence Number
LS Checksum
Advertising Router (T1)
Length
LS Type = 10
Header
TTZ ID = 100
E=1 for Edge of TTZ
OptionsLS Age
LS Sequence Number
LS Checksum
Advertising Router (T5)
Length
LS Type = 10
Header0 4 0
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 Router LSA by T1 for Virtualizing TTZ (Same)(Same)
R6
R7
R8
R10
R9
R4
R1 R2
R11
R3
R5
T4
T3
T10
T1
OptionsLS Age
Link State ID (T1)
LS Sequence Number
LS Checksum
Advertising Router (T1)
Length
Number of LinksNormal 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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ContentsContents
Smooth Migration to TTZ Smooth Migration to TTZ (new)(new)
Smooth Migration to TTZSmooth Migration to TTZMigration to TTZ with minimum interruption 1. Configure TTZ: routers in TTZ work as normal and prepare for TTZ2. Allow router to TTZ after it is ready for TTZ3. 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.