7206vxr & pci bus

[grunky]

I've heard that if you have multiple high speed WAN cards on a 720x vxr that you should distributed them between oddly and evenly numbered slots.

The reason for this is that the 720x vxr routers have 2 pci buses. If you put cards on only the left side that bus will be saturated and the even slots, on another bus, will be empty.

Is this true? If so where is this documented?

Thanks.

[tblancha · Accepted solution]

What you have heard is very much true.

Documentation is at

http://www.cisco.com/en/US/partner/products/hw/modules/ps2033/products_configuration_guide_chapter09186a008014cf5c.html

and what I think is the best document on this is

http://www.cisco.com/application/vnd.ms-powerpoint/en/us/guest/products/ps341/c1161/ccmigration_09186a008009184d.ppt

What you end up doing is for each module there are 'bandwidth points'. Each PCI bus cannot exceed a certain number of points. The documents will describe the details of the algorithm

[grunky]

Hey - thanks for the links! I did noticed that the npe-300 wasn't in the ppt. Thats the npe we're running.

But yes - thanks for the heads up.

[grunky]

This covered the npe-300 and was really good.

http://www.cisco.com/en/US/products/hw/modules/ps2033/products_configuration_guide_chapter09186a008014cf5c.html