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Beginner

ip dhcp snooping database on ftp, is it really needed?

Hello fellow Network Engineers,

We have deployed dhcp snooping and partially dai and we are questioning whether we really need to configure dhcp snooping database agent to store the db to ftp.

I know the purpose is for the switch to read the db after it reboots, but from my testings, if the switch reboots, the hosts will send a dhcp request again and the in memory dhcp snooping db will be rebuilt

I read somewhere that is only needed if you have a double supervisor, so that in case of primary sup failure, the backup supervisor will read the db from database. Isn't this synchronized between the two sups?

Also in situations, where you have multiple stacked switches, is the in memory db copied from master to other members?

I appreciate any comments.

thanks,

George E.

 

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VIP Advisor

Re: ip dhcp snooping database on ftp, is it really needed?

Hello

My understanding is if the master is lost in an existing stack then the new elected master will begin excepting the dhcp packets, As for any failed master/member switch participating in dhcp snooping, Then its bindings are maxed aged, So only what would be lost would be from the switch that failed.

 

If the whole stack failed and reloaded then without a valid DHCP snooping D/B  and with DAI enabled also then communication would be lost until the snoopping D/B is populated again.



kind regards
Paul

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Beginner

Re: ip dhcp snooping database on ftp, is it really needed?

this does not answer my question.
from my experience, on a switch with DHCP and DAI enabled, when rebooted, all hosts retrasmit a dhcp request, so the database is repopulated.
there is a loss of connection only for couple of seconds until hosts resend the dhcp request.
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