North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Cisco: limit number of DHCP addresses per VC?
On Wed, Feb 04, 2004 at 08:38:27AM -0600, Claydon, Tom wrote: > Question for the list: > > Cisco introduced a command in 12.3T to limit DHCP leases on ATM unnumbered > interfaces (ip dhcp limit lease per interface). This feature works fine on > our 7206VXR, but my problem is that this is a global command. The Redback we > were using before had us spoiled by allowing us to specify max DHCP leases > per ATM VC! We would like to put other ATM VC's on this router that have > different DHCP lease requirements. > > Is there any way of limiting DHCP leases per VC? Cisco TAC said they didn't > have a non-global version of the ip dhcp limit lease per interface command. > > Our DHCP server is running dhcpd 2.0p15, BTW. You can use the option 82 in the DHCP packet to do this on the DHCP server, something like # By default limit all customers to 1 DHCP lease class "customer" { spawn with option agent.remote-id; lease limit 1; } subclass "customer" __OPTION_82_STRING_FOR_CUSTOMER__ { lease limit 2; } __OPTION_82_STRING_FOR_CUSTOMER__ will be something like 01:01:00:00:01:02:03:04:40:02:01:20 ^^^^^^^^^^^ ^^^^^^^^^^^ ^^ ^^ ^^^^^ fixed NAS IP addr | | VCI | VPI Port in this case 4/0 So this customer's pvc is 2/288 on ATM4/0 on the NAS with address 1.2.3.4 /Jesper -- Jesper Skriver, jesper(at)skriver(dot)dk - CCIE #5456 One Unix to rule them all, One Resolver to find them, One IP to bring them all and in the zone to bind them.
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