ospf topology-transparent zone huaimo chen renwei li gregory cauchie ning so

OSPF Topology-Transparent OSPF Topology-Transparent ZoneZone

Huaimo Chen ([email protected])Renwei Li ([email protected])

Gregory Cauchie ([email protected])Ning So ([email protected])

Lei Liu ([email protected])Alvaro Retana ([email protected])

ContentsContents

Smooth Migration to TTZ Smooth Migration to TTZ (new)(new)

Changes to OSPF ProtocolChanges to OSPF Protocol

IntroductionIntroduction

Next StepNext Step

LSA Change – I bitLSA Change – I bit

TTZ TLV in RI LSATTZ TLV in RI LSA (new)(new)

Operation Simplified Operation Simplified (new)(new)

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 TTZRemoved

A group of TTZ edge routers

Operation Simplified: 1 cmd/router

Configurations on router T1:router ospf 1Interface ethernet 1/0 ip address 10.10.120.1/24Interface ethernet 2/0 ip address 192.168.20.1/24 ttz 192.168.100.100

Configurations on router T5:router ospf 1 ttz 192.168.100.100Interface ethernet 3/0 ip address 192.168.30.1/24

No configuration changes on router outside TTZ

Configurations on router R2:router ip ospf 1Interface ethernet 0/0 ip address 10.10.120.1/24Interface 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

Eth0/0Eth1/0

Eth1/0 Eth4/0Eth3/0

Eth2/0

Eth1/0

Eth2/0Eth3/0

Eth4/0

Eth0/0 Eth1/0

Eth1/0

Eth2/0

Eth3/0Eth4/0

Eth2/0

Eth0/0 Eth1/0

Eth1/0Eth0/0

Will Simplify It More

ContentsContents




Next StepNext Step


TTZ TLV in RI LSATTZ TLV in RI LSA (new)(new)


LSA Change — I bit1 bit to identify if a link is in TTZ

0 1 2 7

I Link Type

I = 1: Link is in TTZI = 0: Link is not in TTZ

Meaning of “Link Type” of 7 bits is the same as that of “Link Type” of 8 bits.

0 1 2 7

Link TypeOptionsLS Age

Link State ID

LS Sequence Number

LS Checksum

Advertising Router

Length

Number of LinksI bit = 1 if link in TTZ

LS Type = 1

Router Link

Router Link

. . . . . .

Flags

Header

I bit = 1 if link in TTZ

Router LSA

Router LSA Generated by T1/T5 to inside TTZRouter 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

OptionsLS Age

Link State ID (T1)

LS Sequence Number

LS Checksum

Advertising Router (T1)

Length

Number of LinksI=0 for Normal Link

LS Type = 1

Router Link: T1 to R2

Router Link: T1 to T5

Flags

Header



I=1 for TTZ link

I=1 for TTZ link

I=1 for TTZ link

OptionsLS Age

Link State ID (T5)

LS Sequence Number

LS Checksum


Length

Number of LinksI=1 for TTZ Link

LS Type = 1



Flags

Header



I=1 for TTZ link

I=1 for TTZ link

I=1 for TTZ link

Router LSA by T1 for Virtualizing TTZRouter LSA by T1 for Virtualizing TTZ

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


Length

Number of LinksNormal Link

LS Type = 1



Flags

Header



Normal Link (“virtual”)


ContentsContents




Next StepNext Step


TTZ TLV in RI LSA TTZ TLV in RI LSA (new)(new)


TTZ TLV in RI LSATLV for Info of TTZ router

01

3

TTZ ID

E

Length

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


Length

LS Type = 10

Header

TTZ ID = 100

E=1 for Edge of TTZ

OptionsLS Age

LS Sequence Number

LS Checksum


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

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


Length

Number of LinksNormal Link

LS Type = 1



Flags

Header





ContentsContents




Next StepNext Step


TTZ TLV in RI LSA TTZ TLV in RI LSA (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

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

Next StepNext Step

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ospf topology-transparent zone huaimo chen renwei li gregory cauchie ning so

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