crossbar mode vs bus mode in 6500

Answered Question
Feb 19th, 2010

Hello.

In terms of capacity of bandwith, what is the best mode? crossbar mode or bus mode?

Thanks!!

Correct Answer by francisco_1 about 7 years 6 hours ago

The bus mode is shared at half duplex 32 Gbps between the linecards and the sup engine. All packets transitted on the bus is sent to all cards.

The crossbar provides a dual  dedicated faric channels for fabric enable line cards to transit and receive data which is much more faster than shared bus. Sup 720 provides crossbar archecture.

See this for more info  http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper0900aecd80673385.html

Correct Answer by Giuseppe Larosa about 7 years 6 hours ago

Hello Jmontoro,

in terms of performance crossbar mode is better it means usage of the switching fabric on the switch, with current sup720 this means connection(s) to the 720 Gbps switching fabric.

the bus means the 32 Gbps (half-duplex) shared bus.

This is used by legacy linecards and by some service modules like CSM.

to be noted in the same chassis different modules can be in different mode.

Hope to help

Giuseppe

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Correct Answer
Giuseppe Larosa Fri, 02/19/2010 - 02:53

Hello Jmontoro,

in terms of performance crossbar mode is better it means usage of the switching fabric on the switch, with current sup720 this means connection(s) to the 720 Gbps switching fabric.

the bus means the 32 Gbps (half-duplex) shared bus.

This is used by legacy linecards and by some service modules like CSM.

to be noted in the same chassis different modules can be in different mode.

Hope to help

Giuseppe

Correct Answer
francisco_1 Fri, 02/19/2010 - 02:58

The bus mode is shared at half duplex 32 Gbps between the linecards and the sup engine. All packets transitted on the bus is sent to all cards.

The crossbar provides a dual  dedicated faric channels for fabric enable line cards to transit and receive data which is much more faster than shared bus. Sup 720 provides crossbar archecture.

See this for more info  http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper0900aecd80673385.html

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