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Multiple VLANs & multiple DHCP in 6509 with FWSM?

i have 6500 & have about 32 Vlan for voice & data

to each vlan there are DHCP pool & it knows the range from interface vlan & each vlan have its default router

NOW i need to add FWSM to protect the data so i need to remove Interface Vlans from the switch to FWSM

so i wonder how the DHCP pool will know the respective VLAN

is there are any configuration or it will know it from FWSM or it won't be recommended to use DHCP server on switch in this case

Hall of Fame Super Blue

Re: Multiple VLANs & multiple DHCP in 6509 with FWSM?


If i understand correctly you need the FWSM to forward on DHCP requests from clients attached to it's interfaces.

If i have understood you can do this as the FWSM has a DHCP relay feature although there are a number of caveats to it's use. Attached is a link to a doc with details on this feature

Hope i have understood


New Member

Re: Multiple VLANs & multiple DHCP in 6509 with FWSM?

HI jon

thank you a lot

u understood the problem good & u help me to be sure from the DHCP relay

& i use the RelayServer as the MSFC interface VLAN

thank you alot

Mohamed Zamzam

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