Different Option 43 strings based on Subnet

[Martin McCormick]

	We have a set of global definitions to configure Cisco
wireless AP's which use vendor encapsulated option or option 43
strings that are presently global so they exist in the global scope.

	We want that part of the configuration to be local and
based on the subnet that the bootP request comes from. In
practice, the AP's boot more quickly if they are handed the
addresses of the controllers for that subnet than if they are
given other controller addresses and forced to figure out their
controllers during the booting process. This means a custom
Option 43 string for each subnet with the rest of the
configuration process being common to all. Is this possible
using dhcp3.1.3?

	Thanks for any suggestions or references. I am just not
quite sure how to do this if it is possible but I am thinking it
is. Obviously each subnet declaration will have the encapsulated
string that is picular to that network and the global definition
needs something that calls this test.

	Our global options are as follows:

class "1200 series AP" {
match substring (option vendor-class-identifier, 0, 14);
option vendor-encapsulated-options f1:0c:0a:c1:21:2d:0a:c1:e1:2d:0a:c1:41:2d;
} #end class "1200 series AP"
subclass "1200 series AP" "Cisco AP c1200";
class "1240 series AP" {
match substring (option vendor-class-identifier, 0, 14);
option vendor-encapsulated-options f1:0c:0a:c1:21:2d:0a:c1:e1:2d:0a:c1:41:2d;
} #end class "1240 series AP"
subclass "1240 series AP" "Cisco AP c1240";
class "1250 series AP" {
match substring (option vendor-class-identifier, 0, 14);
option vendor-encapsulated-options f1:0c:0a:c1:21:2d:0a:c1:e1:2d:0a:c1:41:2d;
} #end class "1250 series AP"
subclass "1250 series AP" "Cisco AP c1250";
class "1500 series AP" {
match substring (option vendor-class-identifier, 0, 14);
option vendor-encapsulated-options 66:08:0a:c1:61:2d:0a:c1:61:2f;
} #end class "1500 series AP"
subclass "1500 series AP" "Cisco AP c1500";
subclass "1500 series AP" "Cisco AP c1520";


Martin McCormick WB5AGZ  Stillwater, OK 
Systems Engineer
OSU Information Technology Department Telecommunications Services Group