Arie,
Seems straight forward. Would there be an issue with the default gateway
assignment from the DHCP server.
BRAS-A
Loopback 0
x.x.96.1/21
BRAS-A DHCP scope
x.x.96.20 - x.x.103.254
options router x.x.96.1
BRAS-B
Loopback 0
x.x.104.1/21
BRAS-B DHCP scope
x.x.104.20 - x.x.111.254
options router x.x.104.1
So if a client logs into BRAS-A and is assigned a static IP from the
DHCP scope x.x.96.54 with a default gateway of x.x.96.1 there is no problems
If the same client logs into BRAS-B and is assigned the same static IP
x.x.96.54 with a default gateway of x.x.96.1 how would the client route
out of his subnet.
client --------------------------- BRAS-B
---------------------------------- BRAS-A ------------
x.x.96.54 ----------- x.x.104.1 ----- x.x.1.1 -- iBGP -- x.x.1.2
----------- x.x.96.1 -------
I am not even sure that what I want to do is possible because the DHCP
server will see the giaddr in the dhcp request from BRAS-B as x.x.104.1
and will try assign an address from the the BRAS-B scope and my static
assignment is from the BRAS-A scope.
I use username to assign static address on the DHCP server
host custid_xxxxxxxxxx { option dhcp-client-identifier
"\[email protected]"; fixed-address x.x.96.54; }
Maybe I need to revisit how I assign IP to customers. Would you have any
recommendations.
Thanks
Anthony
Arie Vayner (avayner) wrote:
Anthony,
Usually for static IP assignments you would have to redistribute the
connected/static (static for routes) prefixes into the routing protocol
(I would recommend BGP) so that you advertise them as /32. No magic...
Arie
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Anthony McGarry
Sent: Monday, February 22, 2010 13:50
To: [email protected]
Subject: [c-nsp] BRAS Redundancy
Hi,
I was hoping someone can help me with the following issue.
I currently have a 7301 acting as my BRAS running on 12.2(33)SRD3. I use
the ISG feature to terminate PPPoE sessions on QinQ subinterfaces.
The virtual templates associated with the bba groups use ip unnumbered
loopback 0.
The IP on loopback 0 is x.x.96.1/21
DHCP is configured for client IP address assignment using DHCP pools as
relay agents to a central DHCP server.
ip dhcp pool DHCP
relay source x.x.96.0 255.255.248.0
class DHCP
relay target x.x.111.5
I would now like to install a second 7301 for load balancing/redundancy.
I currently trunk the QinQ vlans to the existing 7301 so I just do the
same for the second 7301.
On the second 7301 I assign a new /21 network for DHCP assignment.
This works fine for dynamic IP assignment.
My problem is that we have multiple customers with static IP address
assignment from the DHCP server.
How can I assign the same IP address to a certain client session if they
login to either BRAS when each BRAS has a unique network associated with
the loopback 0 interface.
I was thinking mobile IP but I have not tested in the lab and not sure
if it is a supported solution.
Anthony
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