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5120 IRF Question

 
aali
Frequent Advisor

5120 IRF Question

How important is to configure MAD when configuring IRF.  If there is one phyiscal link in IRF between two switches, then I understand the need of IRF-MAD, but if there are two physical links in an IRF, what are the odds that both physical links will go down at the same time.

 

5120 only supports IRF MAD-ARP, and according to HP, MAD-ARP is not as effective as MAD-BFD or MAD-LACP.

 

Thanks,

 

5 REPLIES
manuel.bitzi
Trusted Contributor

Re: 5120 IRF Question

Same opinion as you. I only use MAD with Chasis switches.

 

br

Manuel

H3CSE, MASE Network Infrastructure [2011], Switzerland
aali
Frequent Advisor

Re: 5120 IRF Question

Manuel,

 

Thanks for agreeing with my concern.  Any reason why you would use MAD witch Chassis-based switches even if you have multiple physical port bind to IRF.  Is it because the chassis-based switches are typical used at the core layer and you want to avoid any issues at the core layer.

 

Just curious!

manuel.bitzi
Trusted Contributor

Re: 5120 IRF Question

Yes, it's only an additional security for the core/distribution layer to avoid a split brain.

H3CSE, MASE Network Infrastructure [2011], Switzerland
sundoo
Occasional Advisor

Re: 5120 IRF Question

I agree with you both. The only important thing to take into account is that the 2 links should be connected to different TenGigabit Interface cards. 

Alan-WJ
Occasional Advisor

Re: 5120 IRF Question

Best protection for IRF is to use ring topology so connect the top unit to the bottom unit as well, if you have a break then should be fine. MAD BFD requires another physical interface to run so only really ever used in the core