07-21-2009 06:07 AM - edited 03-04-2019 05:30 AM
Dear All,
I have to implement a senerio in my office. the points below explain the requirment.
1. We have two ISPs, each link is 3Mbps
2. We have one Internet router with four Fastethernet Ports
3. We have to connect links from both the ISPs and use both the links for load balancing and failover.
4. attached is the ppt, which could explain in more detail.
Please help with the concept and configuration.
07-21-2009 06:20 AM
Here's a helpful link. Check out the rest of the site as well, it's full of great information.
http://wiki.nil.com/Video:Small_site_using_BGP_on_two_uplinks_into_an_MPLS_VPN_network
Hope it helps.
07-21-2009 06:27 AM
Hi MSU,
Will you be running a routing protocol with the ISP or using static routes.
static load balancing, you can configure traffic load balancing on a per-packet basis without using a dynamic routing protocol.
Most routers will perform load balancing automatically if several equal cost paths to a destination exist on multiple interfaces.
Cisco routers perform load balancing on a per-destination, per-source-destination and per-packet basis. Load can be balanced across up to six equal cost paths.
ip route x.x.x.x y.y.y.y e0
If you are using a routing protocol please let me know which protocol are you using.
Chao
Vishwa
07-21-2009 08:13 AM
Dear Chao,
I will use static routing.
Please let me know the configuration for this.
07-21-2009 10:54 AM
for what you are saying your routes will look like this:
ip route 0.0.0.0 0.0.0.0 FastEthernet0/0
ip route 0.0.0.0 0.0.0.0 FastEthernet0/1
07-21-2009 08:41 PM
right, even though outgoing traffic is load balanced there is no way to guarantee return traffic is doing the same.
07-22-2009 06:27 AM
Hi Chink,
Good point raised here ,but this is what i think will happen.
If the packet will go to internet using ISP 1 public ip it will not come back through ISP 2 path but only ISP 1 path and viceversa,since different ISP.
So packet transferred through ISP1 will come back through the same link.
The only difference will be the delay provided the ISP to access internet.
This is what my understanding is.
Chao
Vishwa
07-21-2009 08:51 PM
hi,
let me know what type of link you are getting from service provider.
1.copper link (serial termination)
or
2. Fiber link (Ethernet delivery)
if its fiber Ethernet delivery, you need to add few more command in order to achieve automatic failover
bcoz ethernet interface will never put down its carrier signal.
Regards,
Hariharan k
07-21-2009 10:14 PM
Dear,
One is wireless link and the otherone is fiber link, both the links will be connected to the ethernet ports of the router.
07-21-2009 10:27 PM
HI,
here is the sample configuration for you.
Hope this will help you
IP sla monitor 1
type echo protocol ipIcmpEcho your_first_test_ip source-ipaddr your_source_ip
timeout 2000
threshold 2000
frequency 3
IP sla monitor schedule 1 life forever start-time now
track 100 rtr 1 reachability
delay down 10 up 20
IP sla monitor 2
type echo protocol ipIcmpEcho your_second_test_ip source-ipaddr your_source_ip
timeout 2000
threshold 2000
frequency 3
IP sla monitor schedule 2 life forever start-time now
track 200 rtr 1 reachability
delay down 10 up 20
IP route 0.0.0.0 0.0.0.0 x.x.x.x track 100
IP route 0.0.0.0 0.0.0.0 x.x.x.x track 200
if you are using Nating
ip nat inside source route-map ISPA interface FastEthernet0/1 overload
ip nat inside source route-map ISPB interface FastEthernet0/0 overload
access-list 110 permit ip 192.168.6.0 0.0.0.255 any
route-map ISPA permit 10
match ip address 110
match interface FastEthernet0/1
!
route-map ISPB permit 10
match ip address 110
match interface FastEthernet0/0
Regards,
Hariharan k
07-21-2009 11:40 PM
Thanks Dear, I will try this configuration and will reply you back
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