[c-nsp] PoP Design...

[Mark Tohill]

Hi,
 
We have the following:
 
 
H1----SW1----6500-01----7200-01----ISP1-Router1
 \    /\     /| |   \   / |
  \  /  \   / | |    \ /  |
   \/    \ /  | |     X   |
   /\     \   | |    / \  |
  /  \   / \  | |   /   \ |
 /    \ /   \ | |  /     \|
H2----SW2----6500-02----7200-02----ISP1-Router2
 
H-Host
SW-L2 Switch
 
 
I hope this makes sense.
 
The 6500's have single Sup720/PFC3/MFSC3 and Gigabit Line Cards.
VLAN's spanning Access switches(SW1,SW2....) and trunked via 802.1q 
to 6500's. Etherchannel between 6500's is L2. 
>From the aggregation 6500's to edge 7200's, there are L3 /30's and OSPF.
 
Regarding adding 'customer' routers, I mean DSL aggregation and Dialup
Access Servers,
is there a best way to connect these?
 
It seems there are a number of options:
 
1. VLAN them across the 6500's by connecting their 10/100/1000 ports to
access 
ports on the LC's. Connect backup interfaces to a different VLAN and
repeat.
 
2. Create 2 x L3 /30's to each 6500 from each NAS/aggregation router and
let OSPF/static
routing take care of resiliencey.
 
Can any one tell me which way is best?
 
Thanks,
Mark