[c-nsp] ip subscriber dhcp help
Mike
mike-cisconsplist at tiedyenetworks.com
Wed Jul 30 14:07:52 EDT 2014
Hi,
I'm working thru trying to set up a new asr1000 for subscriber
service and I'm having trouble understanding how to incorporate dhcp
based subscribers into my radius-based architecture.
I have the following interface config:
interface GigabitEthernet0/0/0.120400
description xxxx - Subscriber DHCP
encapsulation dot1Q 400 second-dot1q 12
ip dhcp relay information trusted
ip dhcp relay information policy-action keep
ip address 172.16.128.1 255.255.255.0
ip helper-address 10.0.16.198
ip subscriber l2-connected
initiator dhcp
end
I can issue a dhcp request on a client connected to that interface
and the whole dhcp relay process works correctly and an ip is allocated
and assigned to the client. I can also "sh ip subscriber detailed" and
the router has in fact created an ip subscriber session too:
IP subscriber: xxxx.xxxx.xxxx, type connected, status up
display uid: 406, aaa uid: 419
segment id: 4193, session hdl: 0x2C000008, shdb: 0x2000196
session initiator: dhcp discovery
access interface: GigabitEthernet0/0/0.120400
access address: 172.16.128.2
service address: 172.16.128.2
conditional debug flag: 0x0
control plane state: connected, start time: 00:15:54
data plane state: connected, start time: 00:15:54
arp entry: 172.16.128.2, GigabitEthernet0/0/0.120400
forwarding statistics:
packets total: received 0, sent 0
bytes total: received 0, sent 0
packets dropped: 0, bytes dropped: 0
hardware forwarding statistics:
packets total: received 92, sent 0
bytes total: received 40287, sent 0
Ok so the basics are out of the way. My question now is - how do I
assign subscriber profile attributes from my radius, and how do I get
the router to give me accounting statistics for these sessions? I'm
looking to achieve parity with PPPoE based subscribers where I stuff all
the required bits into the access-accept message with Cisco-AVPair
attributes for example. DHCP has no such function (?) so theres no way
to return anything other than dhcp messages like netmask, ip address and
name servers. I've been staring at the cisco ISG guides for a long time
and am throughly confused. Does anyone have an easy/simple example or
explanation?
Thank you.
Mike-
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