I am using 1 7200 router and 2 isp's. I am not able to use bgp (cause 1 isp won't allow it ...BS) so i need to do this another way. How can I do load balancing and fail over on a single router going to to different isp's ?
There are several approaches you might be able to use, depending upon the details of your situation and exactly what your are trying to accomplish. For example, if you are using NAT with both, its really tough, but I tend to doubt that is the case if you can afford a 7200. One approach is discussed in my book (see Listings 8-25 and 8-26 on my web site), a two router solution for two ISPs and no BGP with fairly specific assumptions on addressing and environment. If the environment is fairly close to yours, you could adapt it to a single router. Regardless, it will give you a better idea of what you are up against and some of the considerations you will need to take into account to develop a workable solution.
Keep in mind that no matter what you do, you only get load balancing and fail over for inside users going out, and they will see disruption when the path they are using fails and they have to reconnect via the other ISP (using another IP address from the view of the outside world). Note also that you will only failover if the router can detect link failure at the link level, which implies point-to-point links. With frame relay, cable or DSL you need a router which can "ping" to test link upness, such as a Nexland pro800 turbo or waiting for the rumored IOS enhancement.
The only CLEAN way to do this is to run BGP with both providers. If one of the ISP's refuses to run BGP with you, threaten to take your buisness elsewhere! You can try all sorts of things involving NAT, DHCP, etc but none of these solutions is going to provide clean failover and they are a nightmare to manage.
If ISP1 will not run BGP with you, find a different ISP! If you are in an area that only has 2 providers, you *may* be better off moving both connections to one of the ISPs (into 2 different routers, POPs, etc). While you will not be protected against failures within the ISP (or if the ISP loses connectivity), you will probably still have much better uptime / survivability. You will probably also be able to load-balance over your 2 connections.
(For this discussion, ISP1 is the one that won't speak BGP, ISP2 is the other (better?!) one!)
If you are determind to make everything work with these 2 ISPs (and you have space from ISP1), you could always see if ISP1 will let you anounce the space through ISP2. If so, set up BGP with ISP2 and announce the space. Your announcement will be more specific through ISP2 and so trafic will take that path. If ISP2 goes down (or you lose your connection to them!), traffic will follow the the aggregate to ISP1. (Make ISP2 send you a default, and have a high cost default static pointing at ISP1 for outbound). This is also not a perfect solution, as is leads to fragmentation of ISP1s space, but you will have clean, fast, transparent failover.
(Most of the above is assuming that you need reachability from the Internet (you have servers) and that you have a largish set of addresses (trying to annonce a /29 through ISP2 won't accomplish anything, you need a /24 or bigger.) If this is just for reachabilty for a small to medium enterprise, you may want to consider someting like differant NATs, etc.).
Good luck, but remember, you are the customer. You are paying ISP1 to provide you with ISP service. If they aren't willing to provide you with the service you require, find someone who will!
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
Im studying the 100-105 book by Odom and am currently on the topic of Port security. I purchased a used 2960 and I'm trying to follow a...
While deploying a number of 18xx/2802/3802 model access points (APs), which run AP-COS as their operating platform. It can be observed on some occasions that while many of their access points were able to join the fabric WLC withou...
I am going to design and build an LAN network under a tunnel underground with long distance between the switches.
I will have 2 Catalyst switches and 8 Industrial IE3000, and they will be connected with fiber.
For now I am planning on use Layer-2 s...