12-18-2007 08:41 PM - edited 03-03-2019 07:59 PM
I have 2 ISP links to my router how can i config the load balancing? Can u send me example command for load balancing?
12-18-2007 08:58 PM
sophaunsim,
You can configure two equal cost static route for load balancing. see example below.
ip route 0.0.0.0 0.0.0.0 XX.XX.XX.XX name ISP-1
ip route 0.0.0.0 0.0.0.0 XX.XX.XX.XX name ISP-2
However, your ISP may only allow traffic coming from the ip address they allocated for you. Any ip address from other ISP may get block.
12-18-2007 09:03 PM
what cost static route can you explance me?
Thanks,
12-18-2007 09:22 PM
By default, static route with next hop ip address and connected to local interface have admin distace of 1 and cost/metric of 0 as you can see from the sh ip route output below.
the defaul route has two entries 10.10.10.2 and 20.20.20.2
Router#sh ip route
[deleted]
20.0.0.0/24 is subnetted, 1 subnets
C 20.20.20.0 is directly connected, GigabitEthernet0/1
10.0.0.0/24 is subnetted, 1 subnets
C 10.10.10.0 is directly connected, GigabitEthernet0/0
S* 0.0.0.0/0 [1/0] via 20.20.20.2
[1/0] via 10.10.10.2
As you can see the traffic share count is 1. this mean router is using equal cost load balance between two ISPs. .
Router#sh ip route 0.0.0.0
Routing entry for 0.0.0.0/0, supernet
Known via "static", distance 1, metric 0, candidate default path
Routing Descriptor Blocks:
20.20.20.2
Route metric is 0, traffic share count is 1
* 10.10.10.2
Route metric is 0, traffic share count is 1
sample config
!
!
!
interface GigabitEthernet0/0
ip address 10.10.10.1 255.255.255.0
duplex auto
speed auto
!
interface GigabitEthernet0/1
ip address 20.20.20.1 255.255.255.0
duplex auto
speed auto
!
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.10.10.2 name ISP-1
ip route 0.0.0.0 0.0.0.0 20.20.20.2 name ISP-2
!
Router#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 20.20.20.2 to network 0.0.0.0
20.0.0.0/24 is subnetted, 1 subnets
C 20.20.20.0 is directly connected, GigabitEthernet0/1
10.0.0.0/24 is subnetted, 1 subnets
C 10.10.10.0 is directly connected, GigabitEthernet0/0
S* 0.0.0.0/0 [1/0] via 20.20.20.2
[1/0] via 10.10.10.2
12-19-2007 08:54 PM
I ready to configured follow that you explance me so how can I test connections? because I don't know it is work realy or not.
12-19-2007 09:11 PM
Hi,
Execute "show interface [interface-id]" in the router for both interface connecting to your two ISP.
You should see TXLOAD and RXLOAD for both.
Regards,
Dandy
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