From: ccie2be (ccie2be@nyc.rr.com)
Date: Mon Nov 29 2004 - 15:00:39 GMT-3
Hi guys,
I would like to just confirm something regarding the above.
Assume a router's ethernet interface is connected to a 3550 port which is vlan
X along with a bunch of hosts.
Also, the router is configured as dhcp server for the hosts in vlan X.
Am I correct in thinking that nothing related to dhcp must be configured on
the 3550?
The way I understand it, when a host in vlan X powers up and sees it needs an
ip address, it will broadcast a dhcp request. The 3550, when it gets that
broadcast, will flood the broadcast out all ports in vlan X. Thus, the router
acting as a dhcp server will get the broadcast dhcp request. After getting
the request, the router will respond using the source mac address of the
request as the destination mac address.
When the 3550 gets the response, it will forward it to the host.
In other words, the default behavior of the 3550 is such that nothing related
to dhcp (such as dhcp snooping, dhcp relay, etc) is required for dhcp to work
properly in the above scenario.
I'd hate to lose points for dhcp on the lab if I correctly configure it on the
router and forget to configure some stupid little thing on the 3550.
TIA, Tim
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