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ip helper-address traffic??

opers13
Level 1
Level 1

‎03-23-2010 04:50 AM - edited ‎03-06-2019 10:16 AM

Question on IP helper and broadcast...so PCs will broadcast a DHCP request within a VLAN.

Once requests reach the SVI with an IP helper-address command, will the SVI also broadcast the request to the DHCP server?

or at this point it's a unicast to DHCP server??

thanks!

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3 Replies 3

francisco_1
Level 7
Level 7

‎03-23-2010 04:59 AM

SVI interface will forward the broadcast DHCP request from the client as a unicast message directed at the helper address, using its own address as the source IP. This is is how the DHCP server knows from which subnet to issue an IP address.

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opers13
Level 1
Level 1
In response to francisco_1

‎03-23-2010 05:18 AM

So broadcast from client to SVI --> Unicast from SVI to DHCP server.

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francisco_1
Level 7
Level 7
In response to opers13

‎03-23-2010 05:48 AM

You got it

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