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backbonefast

Looking at adding backbonefast to our network. Everything that I can find says to use it only if all of your switches support it; we have some older 3524's that while are (single) connected to the network, are only used for server ILO's. As they do not support backbonefast, is it a lost cause to enable everywhere else?

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Re: backbonefast

Hi Brian,

A switch running backbonefast sends RLQs on its non-designated ports and needs to receive an answer to at least one of these RLQs in order to speed up the aging of old information. If your neighbors don't run bbfast, the only thing you risk is just waiting the usual max-age. So basically you have nothing to lose by enabling backbonefast where you can.

For example, if all your distribution switches are able of running bbfast and only your access switches are not, you should be fine. This because your distribution switches probably only have designated ports leading to the access switches, and backbonefast won't use these ports anyway.

You can find some details on backbonefast operation at the following URL:

http://www.cisco.com/warp/public/473/18.html

Regards,

Francois

2 REPLIES

Re: backbonefast

Hi Brian,

A switch running backbonefast sends RLQs on its non-designated ports and needs to receive an answer to at least one of these RLQs in order to speed up the aging of old information. If your neighbors don't run bbfast, the only thing you risk is just waiting the usual max-age. So basically you have nothing to lose by enabling backbonefast where you can.

For example, if all your distribution switches are able of running bbfast and only your access switches are not, you should be fine. This because your distribution switches probably only have designated ports leading to the access switches, and backbonefast won't use these ports anyway.

You can find some details on backbonefast operation at the following URL:

http://www.cisco.com/warp/public/473/18.html

Regards,

Francois

New Member

Re: backbonefast

Good.... I suspected as much, but wasn't positive. 99% of network can run it, just a few of these ilo switches.

Thanks for the info.

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