Re: Load-balancing across four T1's on 2 routers
- From: "James" <jdball55@xxxxxxxxxxx>
- Date: 31 Aug 2006 07:18:51 -0700
I am 99% sure that your layer three switch will see four equal cost
routes not two, when one T1 goes down it will then see three routes.
Your layer three switch will take this into consideration when making
its balancing decision.
James
Igor Mamuzic wrote:
Maybe you could find solution on one of these links:
- if you have 12.3 IOS see:
http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature_guide09186a00801d1e95.html
or
- if you have 12.4 IOS see:
http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature_guide09186a00801d1e95.html
B.R.
Igor
"Sean-Usenet" <sean-usenet@xxxxxxxxx> wrote in message
news:1156990473.405093.218090@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I am setting up the following:
- 2 Cisco 2800 series routers, each has two T-1 internet connections.
- Those 2 routers are also connected to a 100mb layer-3 switch.
- Our firewall will also connected to that layer-3 switch.
- The firewall's' default gateway will be that layer-3 switch.
- The workstations are behind the firewall, and will use the firewall
as their default gateway
- OSPF will be running on the 2 routers and the layer-3 switch, and
also on 2 routers on the ISP's site.
- The OSPF area will be Totally Stubby, thus the ISP's routers will be
advertising default routes into our network.
As long as all four T-1's are up, everything should work fine:
- The workstations will route outbound packets to the firewall
- The firewall will route the packets to the layer-3 switch
- The layer-3 switch is running OSPF and will see two equal cost
default routes, and will load-balance traffic between our two routers
- The routers will in turn also have two defaults routes (1 route
through each T-1), and load-balance traffic across each T-1
My problem is what happens when one T-1 goes down? Our layer-3 switch
will still see equal cost routes and split the traffic across the two
routers, even though one router has 1/2 the bandwidth.
Can someone help me with this problem? Please let me know if you have
any questions on what I explained above! Here is a diagram of the
setup, i hope it looks ok:
R1 R2 (ISP Routers)
|| ||
|| || (4 total T-1s)
|| ||
R1 R2 (Our Routers)
| |
\ /
\ /
\ /
Layer-3
Switch
|
|
|
Firewall
|
|
|
Layer-2
Switch
|
|
|
|
Workstations
Thanks!
Sean
.
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