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victory_is_mine
3 Argentium

Backup traffic is using only one interface in the 4 port LACP link on DD4500

Hi All,

I have a questions:

  1. Backup traffic is using only one interface in the 4 port LACP link? Why could that be? The hashing algorythm is 'lacp hash xor-L3L4: eth4a,eth4b,eth4c,eth4d'.
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4 Replies
paul_aviles
2 Bronze

Re: Backup traffic is using only one interface in the 4 port LACP link on DD4500

Could be several reasons. Can you please describe the switch configuration?

If on a Cisco switch can you do for example:

# show stack

# show interfaces port-channel 1

Paul Aviles

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jbrooksuk
3 Argentium

Re: Backup traffic is using only one interface in the 4 port LACP link on DD4500

Check you have VPc (Cisco) in place if you are using multiple switches.

Vlag for Brocade I think.

Do you have more than two Ethernet switches here (on this Veth port)?

If not then perhaps you have the active interface on one switch and the other 3 on another switch.

Without VPc it will just persistently use only paths on one switch and pretty much ignore the other switch/path.

My question about number of switches being used is because it would normally be that you have only TWO interfaces being used...on one switch -  the other 2 being idle on the other switch.

regards, Jonathan

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victory_is_mine
3 Argentium

Re: Backup traffic is using only one interface in the 4 port LACP link on DD4500

and by the way, it is not DDBOOST backups, it is CIFS backups. the LACP is accross 1GB ports.

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jbrooksuk
3 Argentium

Re: Backup traffic is using only one interface in the 4 port LACP link on DD4500

I assumed it was probably not DDBoost or you would probably be better advised to use ifgroups and not LACP.

My response was based on the likelihood you did indeed need LACP for non-DDboost backups.

Regards,

Jonathan

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