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02-08-2015 01:34 AM
02-08-2015 01:34 AM
Hi, We have several groups of 2x 5900's and have come across two different ways of implementing IRF.
Two interfaces in one IRF port:
irf-port 1/2 port group interface FortyGigE1/0/51 port group interface FortyGigE1/0/52 # irf-port 2/1 port group interface FortyGigE2/0/51 port group interface FortyGigE2/0/52
One interface per IRF port:
irf-port 1/1 port group interface FortyGigE1/0/51 # irf-port 1/2 port group interface FortyGigE1/0/52 # irf-port 2/1 port group interface FortyGigE2/0/52 # irf-port 2/2 port group interface FortyGigE2/0/51
Is there a difference in these configurations? What is recommended configuration?
Thank you.
Solved! Go to Solution.
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02-08-2015 11:43 PM
02-08-2015 11:43 PM
Re: Which IRF port configuration should I do?
We are using the latter config. I assume that in the first config the two interfaces are aggregated, ie. you get 80 gig IRF links.
FYI, we also use the following config for our IRF ring:
irf mac-address persistent timer
irf auto-update enable
undo irf link-delay
irf member 1 priority 32
irf member 2 priority 30
irf member 3 priority 28
irf member 4 priority 26
irf member 5 priority 24
irf member 6 priority 22
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02-09-2015 07:27 AM
02-09-2015 07:27 AM
SolutionHi Miaad,
yes there is a difference.
In your first example you use two physical interfaces in one irf port. That way you can use " IRF link load sharing mode" to get the traffic balanced across the two physical links.
In the second example you use 1 physical port to 1 irf port. I'm not sure how traffic is distributed (if at all) across the 2 IRF ports. It should somehow take "the optimal path" (look at "Packet Forwarding Mechanism")
http://www8.hp.com/h20195/v2/GetPDF.aspx/c04311478.pdf
I haven't been able to find anywhere what this "optimal path" is or how its calculated. There might be some loadbalancing accros IRF port 1 and 2, but I doubt it.
Now I don't know the rest of your setup, and can therefore not exactly say what is best for you.
Regards
Region Midtjylland