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Forum Discussion

Harry1's avatar
Harry1
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Dec 14, 2017

LACP of 10G and 40G ports

Hi,   we have some requirement regrading ports. can we use four 10G ports and one 40G port in single LACP? other side device is cisco nexus 7k with 10G and 40G modules.  
application delivery
BIG-IP
Hannes_Rapp's avatar
Hannes_Rapp
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Dec 14, 2017

"so can we use different port other than management or data port for snmp and syslog?"

 

Sure can. Typical physical appliances have 8 ports in addition to Management. I have one setup where 4 ports are used for data (client-side + server-side VLANs), 2 ports used for HA and traffic mirror (single VLAN for both functions) and 2 ports for ASM remote logging on a dedicated VLAN. You can use this aggregated interface for snmp and syslog instead of remote ASM logging.

 

Obviously, a single 10G interface would be more than enough for syslog and SNMP, however, as with any physical appliances, it's always best to go with LACP links to have that extra insurance against link failures. Fibre cables cost nothing compared to loss of logs due to an interface failure.

 

Hannes_Rapp's avatar
Hannes_Rapp
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Dec 15, 2017

A LACP bundle of 5 units, 4x 10G and 1x 40G? The answer is no. Your best bet is to re-arrange cabling and use both of the 40G ports for the client-side (or server-side) LACP bundle, and then bundle as many 10G interfaces as you need for server-side (or client-side) LACP bundle.

 

Keep in mind with a LACP bundle no single session can utilize more bandwidth than the bandwidth supported by a single interface. So with 4x 10G bundle, a single session is not able to utilize 40G bandwidth, it can still utilize 10G max. The LACP bandwidth advantage comes from session distribution across multiple links but the speed limits as defined by media still apply for individual sessions.