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ITD : Deploying WAE devices while overcoming the deficiencies of WCCP

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Beginner

To scale the performance of WAAS / WAE and to provide high reliability, Cisco has a new feature called ITD.

Please see ITD (Intelligent Traffic Director) White Paper.

Also, recent blog : ITD: Load Balancing, Traffic Steering & Clustering using Nexus 5k/6k/7k

 

ITD Provides CAPEX and OPEX Savings for Customers

ITD (Intelligent Traffic Director) is a hardware based multi-Tbps Layer 4 load-balancing, traffic steering and clustering solution on Nexus 5K/6K/7K series of switches. It supports IP-stickiness, resiliency, NAT, (EFT), VIP, health monitoring, sophisticated failure handling policies, N+M redundancy, IPv4, IPv6, VRF, weighted load-balancing, bi-directional flow-coherency, and IPSLA probes including DNS.

ITD is much superior than legacy solutions like PBR, WCCP, ECMP, port-channel, layer-4 load-balancer appliances.

 

For example, ITD comparison with WCCP:

Feature/Benefit

N7k WCCP

N7k ITD

Appliance is unaware of the protocol

No

Yes

Protocol support

IPv4

IPv4, IPv6

Number of TCAM entries

(say, 100 SVI, 8 nodes, 20 ACEs)

Very High

16000

Very low

160

Weighted load-balancing

No

Yes

User can specify which bits to use for load-balancing

No

Yes

Number of nodes

32

256

Support for IPSLA probes

No

Yes

Support for Virtual IP

No

Yes

Support for L4-port load-balancing

No

Yes

Capability to choose src or dest IP for load-balancing

No

Yes

Customer support needs to look at switch only, or both the switch and appliance

Both

Switch only

Sup CPU Overhead

High

None

DCNM Support

No

Yes

 

Email Query or feedback:ask-itd@external.cisco.com

 

1 Comment

would you please provide a NXOS configuration for WCCP ?

 

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