Hi Mate
apply demarcation at your network diagram and clearly identify the interfaces facing the internet and the interfaces facing the internal hosts. if possible layer the network devices and identify the core devices, distribution devices and access devices.
(//core routers will not run igp - not needed//)
1 - you can use public-ip on all interfaces provided you have enough ip addresses..else think using a NAT with static maps &/r ip pool.
2 - run bgp on the routers interfacing the service provider and you'll be sharing the same subnet of the carrier interface. you may own your own AS else you will be using the AS of the services provider, configure your core routers accordingly.
3 - run ibgp among all the routers that are interfacing the service providers netwrork and running bgp for exchanging ip-bgp routes with in the core routers to maintain a synchronized table but with different path selection policies.
4 - you may understand the BGP's way of choosing the next-hop and may fine tune the bgp path selection parameters individually in each bgp router
5 - you may choose to run a dynamic-routing protocol in the inside cloud. choose a flat(rip/eigrp)/hierarchical(ospf) to handle the internal routing needs, this also depends on the size of your internal network. (this is the distribtuion/access layer)
(devices in distribution/access layers has no need to run BGP, except they need to be aware of the exit points, static routes will help you here along with rip/ospf/eigrp.etc,etc.)
6 - (//ideal) if possible deploy a pysical firewall interfacing the core routers to the rest of your network.(access pool > distribution pool || firewall|| > core pool. (pool here means more than one device at that layer) - you may handle NATing here..
7 - use high bandwidth channels in the distribution channel
8 - think redundancy at all layers ...because you will be running a hosting infrastructure..
allocation of devices depends 100% on your model and your estimated bandwidth needs at each layer.
(**it's advisable to have buffer at all layers, but there is no point wasting resources ... my rule)
good luck!
senthil
---- uk."Pete Shaw" <pete.shaw@totalassist.co.nz> wrote:
>Hi, > >Can anyone please share some greymatter re the following: > >I have just purchase quite a bit of (used)hardware (cisco/foundry/juniper),a >small colo facility and are now planning on setting up an ISP. I have only a >(very) basic understanding of BGP4 and of how routers/switches etc >inter-connect. Long story short, this is what I'm trying to do (and I need >to know if it feasible). > >The cisco 3460 router FA/1 port will be pointing to a peering exchange and >will be carrying all domestic internet traffic.FA/2 is connected to one of >the bigiron's ethernet ports. > >The juniper will be carrying all international traffic on its ATM port and >connects to the bigiron via Ge. > >Q1)What is the best way to configure? Do they all do BGP? OSPF as IGP ? Do I >use private addresses or from the alloted block on their interfaces? >Q2)CA(CustomerA) wants to make use of my bandwidth. CA has a cisco 3400 >router at his end and wants to connect >to my juniper via ATM-PVC and wants to utilize 1meg internationl and 5meg >domestic bandwidth. What's the best way to do this? > >Pete Shaw > > -- thanks,
senthil kumar
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This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:12:47 EDT