I have 3 ADSL's and 2 T1's.
I would like to link 2 or more together for bandwidth and fault tolerance.
Can someone suggest (if possible) how to proceed.
I have 825, 2500 and 2600 series routers.
The ADSL receives IP via DHCP (one IP assigned dynamically for the router, NAT for hosts)
The T1's have class C address scheme.
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While you can do load balancing, make no mistakes this is not one "FAT" pipe. The fastest access speeds are still going to be the same as one T-1. But if you implement load balancing over multiple links then you could hypothetically have 2 users with T-1 speed and three users with ADSL speed all at the same time. Also, with HSRP you could get complete redundancy over all links. No one would ever loose connectivity. Now to do that might take alot of work or just some expensive hardware. Like the Upper Layer Switches from Radware like LinkProof or Cisco's LocalDirector. Those can run alot of money.
Now if money is an issue I would set up then there is alot we can do but I need a good description of your network and of what you can do with those links. Do you own them? Can you use them however you think is best?
get back to me
A better understanding of the network is necessary to make suggestions;
Where do these links terminate to?
Are they links to the internet, or are they links to other remote offices? (I'm assuming that the adsl link is to an isp, yes, no?)
What are you using in terms of routers for these links?
What routing protocol are you using? Static, RIP etc...
Depending on the network you may or may not be able to accomplish what you are trying to do...
With the Cisco routing protocol IGRP you can do some basic load balancing. IGRP uses bandwidth and delay of line as default metrics for determining best route. IGRP can aslo use relaibility, load, and Maximum Transmission Unit (MTU).
The 'Variance' command controls the load balancing between the best metric and the worst accepatable metric.
The 'traffic-share balanced' command causes the router to share inversely proportional to the metrics.
For you to use this the WAN trunks will need to be on the same router. i.e. put the two T trunks on the 2600 and the three ADSL trunks on the 2500. Use HSRP for fault tolerance across the two routers. Or you could put the 2 T trunks and 2 ADSL trunks on the 2600 and one ADSL trunk on the 2500 strictly for fault tolerance. But I'm not sure how IGRP balances across more than two trunks. (Depending on which model 2600, RAM amount, and traffic that may be a bit much for the router.)
With the Cisco routing protocol IGRP you can do some basic load balancing. IGRP uses bandwidth and delay of line as default metrics for determining best route. IGRP can aslo use relaibility, load, and Maximum Transmission Unit (MTU).
The 'Variance' command controls the load balancing between the best metric and the worst accepatable metric.
The 'traffic-share balanced' command causes the router to share inversely proportional to the metrics.
For you to use this the WAN trunks will need to be on the same router. i.e. put the two T trunks on the 2600 and the three ADSL trunks on the 2500. Use HSRP for fault tolerance across the two routers. Or you could put the 2 T trunks and 2 ADSL trunks on the 2600 and one ADSL trunk on the 2500 strictly for fault tolerance. But I'm not sure how IGRP balances across more than two trunks. (Depending on which model 2600, RAM amount, and traffic that may be a bit much for the router.)
What is the outcome of this. I need to do the same thing now. I have a customer who wants to have 1 x T1, 1 x Microwave, and 1 x ADS, all bonded for one fat pip. The Microwave Internet and the DSL are all handed off to me via Ethernet. So i'll have 2 Ethernet and 1 T1. I know I could use Eigrp, but what are my options. I need 1 box to do this. Is there such a thing?
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by: jwalsh88Posted on 2001-05-30 at 20:41:45ID: 6140057
Do you have all of this at one site? Why so many different links? I would say just do load balancing over the two T-1's and using HSRP setup a failover link to an ADSL link for each of the T-1s.