6500 Switching Fabric bandwidth 720 is calculated?

Answered Question

As per my understanding 6509 all slots are dual channel, so 9 slot * 40 per slot (20 g in and 20 g out) = 360 GB

How cisco claim the 720 ?? What about the 6513 chassic switch fabric connection?

Correct Answer by nkarpysh about 5 years 6 months ago

Hello,


As I told above all the line cards and Supervisors in particular are different in FABRIC ASIC sub-modules. Your 10g line card has 2 fabric ASICs thus can use both fabric channels. Sup720 has only single fabric ASIC and can use only one channel.

Nik,

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Joseph W. Doherty Sun, 01/22/2012 - 04:28
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Fabric bandwidths are normally quoted for the duplex capacity, so for the sup720 double your 360 and you get 720.


For the 6513, using a sup720, only the bottom 5 slots (9..13) are 40 Gbps, others are only 20.  (NB: the 6500-E chassis actually supports 80 Gbps pers slot, including the 6513-E, which the sup2t can provide full bandwidth to all slots.)


6500 architecture is explained here: http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper0900aecd80673385.html

SUP720 means swicth fabric BW 720, if i want to full 720GB bandwidth then i need slots with dual channel to switch fabric..is this correct?


Output of one of my 6509-E SUP720-3BXL chasis. If you see only one of my modual at stot 2 is having dual channel can i assume only this is giving me 40Gig switching.

XXXX#sh module

Mod Ports Card Type                              Model              Serial No.

--- ----- -------------------------------------- ------------------ -----------

  1   48  48-port 10/100/1000 RJ45 EtherModule   WS-X6148A-GE-TX   

  2    4  CEF720 4 port 10-Gigabit Ethernet      WS-X6704-10GE     

  3    6  Firewall Module                        WS-SVC-FWM-1      

  5    2  Supervisor Engine 720 (Hot)            WS-SUP720-3BXL    

  6    2  Supervisor Engine 720 (Active)         WS-SUP720-3BXL    

  9   48  48-port 10/100/1000 RJ45 EtherModule   WS-X6148A-GE-TX   



Mod  Sub-Module                  Model             

---- --------------------------- ------------------

  2  Centralized Forwarding Card WS-F6700-CFC      

  5  Policy Feature Card 3       WS-F6K-PFC3BXL    

  5  MSFC3 Daughterboard         WS-SUP720         

  6  Policy Feature Card 3       WS-F6K-PFC3BXL    

  6  MSFC3 Daughterboard         WS-SUP720         

xxx#sh fabric utilization

slot    channel      speed    Ingress %     Egress %

    2          0        20G            0            0

    2          1        20G            0            0

    3          0         8G            0            0

    5          0        20G            0            0

    6          0        20G            1            0

nkarpysh Sun, 01/22/2012 - 07:56
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Hello,


This is correct. Other thatn fabric capacity you also need to consider the line card specific. In your chassis you currnetly have both Fabric  (WS-X6704-10GE     ) and classic (WS-X6148A-GE-TX ) line cards. Last ones do not use fabric at all for switching. They exchange traffic through DBUS/RBUS with Supervisor thus those will not be able to get fabric capacity. SUP has only single channle and 10GB card has 2 fabric asic and can use both fabric channels.


Hope this helps,


Nik

Correct Answer
nkarpysh Sun, 01/22/2012 - 08:28
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  • Cisco Employee,

Hello,


As I told above all the line cards and Supervisors in particular are different in FABRIC ASIC sub-modules. Your 10g line card has 2 fabric ASICs thus can use both fabric channels. Sup720 has only single fabric ASIC and can use only one channel.

Nik,

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