RE:[isp-bgp] isp-bgp digest: May 23, 2005

["Graham Lewis" <graham.lewis@...>]

You will not be allowed to advertise PA (Provider Aggregatable) address space out of your AS to your second ISP. You will have to apply for a block of PI (Provider Independent) address space from your regional registry (whoever you got your ASN from)to advertise out of your AS to your two upstream ISPs. One of your ISPs may be able to help you in the process if making the request for PI address space.

The purpose of PA address space is that it is not de-aggregated.

Subject: BGP Multihoming tips
From: Praful Jaded <praful_jd@...>
Date: Fri, 13 May 2005 20:17:06 +0100 (BST)
X-Message-Number: 1

Hi All,

I currently have to setup a network involving BGP
multihoming to two different ISPs. I have a /24 IP
space from ISP1 now.I would like to use it for my
network involving DMZ.I have two Cisco 7200 routers
which will run IBGP between them and the ISP1
terminates on R1 and ISP2 on R2 running EBGP. I want
to have inbound and outbound traffic load shared
between the ISPs and redundancy when one ISP fails.
Suggest me some good BGP multihoming tuning tips and
what do I need to negotiate with my ISPs for better
reachability of my network in the internet ?

Since I have the PA ( Provider Assigned)  /24 space
from ISP1 , how do I go forward with ISP2 to advertise
it . The two ISPs are peered directly.

Thank You
Praful






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