design

Answered Question
Aug 12th, 2010
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hello


when using cisco nexus 7000 with VDC as an aggregation and core , what should be the link between aggregation and core: L2 or L3?

what is the better choise?

Correct Answer by kyukim about 6 years 11 months ago

Hi,

It depends on your network requirement, budget and business goals.


In general data center's 3 Tier design (Core/Agg/Access), L3 connection is recommended between CORE and Agg layers.


Below is typical 3 Tier Design requirement.



-Core Layer:
Modular Chassis
High 10GE Density
Low Oversubscription
Layer 3 Links to Aggregation
Hand-off to Campus
- Aggregation Layer:
Modular Chassis
High 10GE Density
Layer 2 Trunks to Access
Default Gateway for Servers (L2/L3 boundary)
Typically Attaches Services




- Access Layer:
Top of Rack (ToR)
End/Middle of Row (EoR/MoR)
GE or 10GE to Servers
Layer 2 Switching

Layer

Switch Type

Port Speed

Config

Other

Core

Modular

10GE

Layer 3

Campus hand off

Aggregation

Modular

10GE

Layer 2/3 boundary

Services (optional)

Access

Fixed or Modular

GE/10GE

Layer 2

ToR or MoR

Also, you can use 2 Tier design by combing Core & Agg.
Cisco usually recommend 3 Tier design if you want to have a building block kind of approach to design as you need something to interconnect all those building blocks.
If one building block is enough to satisfy the needs of the network, then you can collapse essentially the core and aggregation into a single layer


You can see more detail from CISCO Datacenter 3.0 IP Infra document.
Hope this helps.
KK...
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Correct Answer
kyukim Thu, 08/12/2010 - 20:28
User Badges:
  • Cisco Employee,

Hi,

It depends on your network requirement, budget and business goals.


In general data center's 3 Tier design (Core/Agg/Access), L3 connection is recommended between CORE and Agg layers.


Below is typical 3 Tier Design requirement.



-Core Layer:
Modular Chassis
High 10GE Density
Low Oversubscription
Layer 3 Links to Aggregation
Hand-off to Campus
- Aggregation Layer:
Modular Chassis
High 10GE Density
Layer 2 Trunks to Access
Default Gateway for Servers (L2/L3 boundary)
Typically Attaches Services




- Access Layer:
Top of Rack (ToR)
End/Middle of Row (EoR/MoR)
GE or 10GE to Servers
Layer 2 Switching

Layer

Switch Type

Port Speed

Config

Other

Core

Modular

10GE

Layer 3

Campus hand off

Aggregation

Modular

10GE

Layer 2/3 boundary

Services (optional)

Access

Fixed or Modular

GE/10GE

Layer 2

ToR or MoR

Also, you can use 2 Tier design by combing Core & Agg.
Cisco usually recommend 3 Tier design if you want to have a building block kind of approach to design as you need something to interconnect all those building blocks.
If one building block is enough to satisfy the needs of the network, then you can collapse essentially the core and aggregation into a single layer


You can see more detail from CISCO Datacenter 3.0 IP Infra document.
Hope this helps.
KK...
Correct Answer
kyukim Thu, 08/12/2010 - 20:28
User Badges:
  • Cisco Employee,

Hi,

It depends on your network requirement, budget and business goals.


In general data center's 3 Tier design (Core/Agg/Access), L3 connection is recommended between CORE and Agg layers.


Below is typical 3 Tier Design requirement.



-Core Layer:
Modular Chassis
High 10GE Density
Low Oversubscription
Layer 3 Links to Aggregation
Hand-off to Campus
- Aggregation Layer:
Modular Chassis
High 10GE Density
Layer 2 Trunks to Access
Default Gateway for Servers (L2/L3 boundary)
Typically Attaches Services




- Access Layer:
Top of Rack (ToR)
End/Middle of Row (EoR/MoR)
GE or 10GE to Servers
Layer 2 Switching

Layer

Switch Type

Port Speed

Config

Other

Core

Modular

10GE

Layer 3

Campus hand off

Aggregation

Modular

10GE

Layer 2/3 boundary

Services (optional)

Access

Fixed or Modular

GE/10GE

Layer 2

ToR or MoR

Also, you can use 2 Tier design by combing Core & Agg.
Cisco usually recommend 3 Tier design if you want to have a building block kind of approach to design as you need something to interconnect all those building blocks.
If one building block is enough to satisfy the needs of the network, then you can collapse essentially the core and aggregation into a single layer


You can see more detail from CISCO Datacenter 3.0 IP Infra document.
Hope this helps.
KK...

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