DHCP lease issue for PPPoA sessions when using external DHCP server

We used to use the Cisco 7206VXR's DHCP server to hand out leases, and when we lost several hundred customers on a link, the router was able to get them up and connected with an IP address within minutes.
We switched over to using an external DHCP server so we could have more control over some extended DHCP options, as well as to aggregate all our DHCP traffic. Now, if we lose 100 DSL customers all at once, it takes 90 minutes for them to come up again. They come in a few at at time, until all 100 are back.
We see waves of RADIUS auth's in our RADIUS log (RADIUS has always been handled externally, so nothing changed there), and continuous streams of DHCP requests come in and DHCP offers go out. What seems to be happening is that a whole bunch of modems auth with RADIUS, request IP addresses, but for whatever reason, timeout when they don't all get their lease, drop the connection, and retry the whole process all over again. We purchased a dedicated DHCP server, thinking that was the bottleneck, but performance is about identical.
Here's our config:
interface Virtual-Template1
ip unnumbered Loopback11
ip helper-address a.b.c.d
peer default ip address dhcp
ppp authentication pap
ppp ipcp dns a.b.c.d e.f.g.h
ppp ipcp unique-address
My questions are:
- is there any performance issue with using an external DHCP server and PPPoA
- is there anything in our config that would cause such delays
Frank

GP:
No, the DHCP server is not across a WAN link; there is only a 10/100 switch in between the router and the DHCP server. There are no dropped packets on the interface.
I ended up opening a case with TAC about this issue. While I had the helper address configured in the template, TAC recommeneded that I specify the actual DHCP server with the command "ip dhcp-server x.x.x.x". This eliminates the DHCPBROADCAST (which I've verified). Perhaps the DHCP relay portion of the Cisco router is performed serially, instead of in parallel. By that, I mean, the next DHCPBROADCAST won't go out until there is the response for the first DHCPBROADCAST.
I'll know in a few days when we test again.
Frank

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