At 2:58 PM +0000 9/30/02, Don wrote: >Rather than run OSPF to customers, it is generally much better to have >them use a default route to the ISP and for the ISP to run static routes to >the customer. OSPF to the customer is a huge land mine for the ISP and >should be avoided in almost every case. > Don
I agree completely with Don that an ISP _never_ should link its IGP to that of the customer. Don't fall into the trap of assuming that BGP needs a full routing table or will consume excessive resources. I remain confused why a default route wouldn't serve, unless there are multiple connections between the ISP and customer. By "send the block to the customer," do you mean the block is in the customer's space? You could certainly use a second static route, which can be generated automatically as part of your address assignment (see my NANOG presentation, http://www.nanog.org/mtg-9811/ppt/berk/index.htm). If that's not appropriate, have the customer announce his two blocks to you with BGP and receive default from your BGP. > > >""Chris Headings"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... >> Good morning all. I was wondering if someone could lend me a little help >> about engineering OSPF in the backbone for an ISP network. I just had a >> couple of questions and hopefully someone can give me some guidance.or >even >> some CCO links with some specific examples or better yet any material >> anywhere. >> >> Say, for example, that a customer has a small block of IP's and a >> distribution router knows where that block is, via a connected route, like >a >> /30 on a serial link. But later down the line the customer requests an >> additional block of 64 IP addresses, what is the best way to send this >block >> to the customer? Do I need to run OSPF on the customer equipment? If the >> customer router is not running OSPF, how do the routers know how to get to >> this destination? I assume via static routing??? >> >> Thanks as always. >> > > Chris Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54550&t=54540 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
