hoogen_82 Wed, 03/14/2007 - 03:12
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Blocking or non blocking is dependent on the Supervisor engine.

Supervisor engine II-Plus -- non blocking

Supervisor engine III -- non blocking

Supervisor engine IV -- non blocking

Supervisor engine V -- non blocking

Supervisor engine V-10GE -- non blocking

If i am right only Cisco catalyst 4000 Supervisor engine 2 is blocking archeitecture.

For more info look into the datasheets http://www.cisco.com/en/US/products/hw/switches/ps4324/products_data_sheets_list.html



Do rate if this helps :)

justanas1 Wed, 03/14/2007 - 03:29
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Dear sir

Thank you

ok but what about the line cards 24 and 48 ports 10/100/1000 is it blocking or not


hoogen_82 Wed, 03/14/2007 - 03:49
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Note that the Supervisor 2 contains a blocking architecture internally, meaning congestion is possible in certain configurations internally on the Supervisor.

The Supervisor 1 is non-blocking, because it contains only a single 24-Gbps non-blocking switching engine that provides each of the 2-Gbps traces to module 2 and module 3 in the Catalyst 4003.

There are three seperate switching engines (SEs) exist (each provide 24-Gbps internal non-blocking forwarding bandwidth), with each providing a 2-Gbps full-duplex trace to each module in the chassis (providing a total of 3 * 2-Gbps or 6-Gbps full-duplex bandwidth to each module).

Although each SE is non-blocking internally, a single 1-Gbps full-duplex connection interconnects the switching engines, which potentially causes blocking (congestion) on the interconnections between each SE if devices attached to one switching engine are communicating with devices attached to another switching engine.

The line cards are only oversubscribed in cases of 48 ports or 24 ports but that term isnt used to describe blocking or non blocking.



Do rate if this Helps :) More importantly these informations are available on the CCNP switching guide.

Amit Singh Wed, 03/14/2007 - 03:36
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Cisco 4500 switch blocking or non-blocking architecture depends on the type of line cards/ modules used in the chassis slots. It doesnot depend on the supervisor engine we are using in the chassis.

If yoyu are using a 6 port 4306GB module then it is non-blocking and if you are using a 48 port blade then it is blocking or oversubsribed.

Please find the list of modules supported on cat 4500 and their oversubscription rate:


HTH,Please rate if it does.

-amit singh


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