cisco ap 1131, vlan and dhcp service

Discussion in 'Cisco' started by pacmas72@gmail.com, Mar 10, 2008.

  1. Guest

    Hello everybody,
    i've configured my Cisco AP 1131 (dot11radio0) using 2 different SSID
    linked to 2 different VLAN; but now, how can i create 2 different DHCP
    scope on the access point, and assign the right one to the right
    VLAN ?
    May you post an example of configuration ?
    Thanks in advance.

    MP
     
    , Mar 10, 2008
    #1
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  2. Merv Guest

    On an access point ,I do not think that you can have multiple DHCP
    pools.

    Remember that an access point is just a bridge. When you set up VLANS,
    in essence you are just configuring multiple bridge groups.

    On an IOS-base router, multiple pools can be supported because the
    DHCP discovery packet arrives thru an interface that has an IP address
    assigned to it. IOS uses that interface IP address to decide which of
    multiple pools to assign from.

    On an AP there can be at most one IP address assigned - to the BVI1
    interface - and that is for management access
     
    Merv, Mar 10, 2008
    #2
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  3. The always perspicacious Merv wrote:
    ~ On an access point ,I do not think that you can have multiple DHCP
    ~ pools.

    You actually can, but, given the following ...

    ~ Remember that an access point is just a bridge. When you set up VLANS,
    ~ in essence you are just configuring multiple bridge groups.
    ~
    ~ On an IOS-base router, multiple pools can be supported because the
    ~ DHCP discovery packet arrives thru an interface that has an IP address
    ~ assigned to it. IOS uses that interface IP address to decide which of
    ~ multiple pools to assign from.
    ~
    ~ On an AP there can be at most one IP address assigned - to the BVI1
    ~ interface - and that is for management access

    .... with multiple VLANs configured on the AP, the only DHCP packets that
    will directly reach the AP from wireless clients will be those that are
    on SSIDs that are mapped to the native VLAN (the one that BVI1 is in.)

    DHCP requests from clients that are in SSIDs bridged to other VLANs will
    simply sail through the AP and out the dot1q trunk interface, without the
    AP's DHCP server seeing them.

    That said, it is possible for the non-native VLANs' default routers to
    use ip helper-address to forward the DHCP requests back to the AP - in
    this way, you *could* have an AP service multiple DHCP pools.

    That said, it would probably make more sense to use your interVLAN
    router(s) as DHCP server(s), than to use your AP for this.

    Aaron
     
    Aaron Leonard, Mar 11, 2008
    #3
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