2 ISP internet connectivity

[anuraggoyal]

I have 2 isp connection for internet connectivity

interface GigabitEthernet0/0/0
description "Railtel_WAN"
ip address 172.27.17.242 255.255.255.252
negotiation auto
!
interface GigabitEthernet0/0/1
description "Reliance_LAN"
ip address 115.249.195.177 255.255.255.248
negotiation auto
!
interface GigabitEthernet0/0/2
description "Reliance_WAN"
ip address 115.254.28.137 255.255.255.252
negotiation auto
!
interface GigabitEthernet0/0/3
description "Railtel_LAN"
ip address 122.252.233.25 255.255.255.248
negotiation auto

can any one help me to configure Wan link load balance

[Kasun Bandara]

Hi,
please share device model you are using, OS version details and what kind of WLLB you are looking for. ex. percentage or ECMP?

[Deepak Kumar]

Hi,

There is some confusion. Are you using your LAN interface subnet as Local IP or is it public IP?

If it is public IP then:

IP Cef
!
ip sla 1
 icmp-echo 8.8.8.8 source-ip 115.254.28.137
ip sla schedule 1 life forever start-time now
track 1 ip sla 1 reachability
!
ip sla 2
 icmp-echo 8.8.8.8 source-ip 172.27.17.242
ip sla schedule 2 life forever start-time now
track 2 ip sla 2 reachability
!
ip route 0.0.0.0 0.0.0.0 interface GigabitEthernet0/0/2 track 1
ip route 0.0.0.0 0.0.0.0 interface GigabitEthernet0/0/0 track 2

By default, CEF will load balance the traffic based on Source and Destination IP address.

If you are using those IPs as LAN private IP (15.249.195.177 255.255.255.248 and 122.252.233.25 255.255.255.248) then you must configure the NAT.

Reagrds,

Deepak Kumar

[balaji.bandi]

As per my understanding you looking Active/Active Link utilisation rather failover ? is this correct.

[Richard Burts]

There are things that we do not know about this environment and that impacts our ability to give good advice. We are told that there are two connections to outside. But not told whether there is any dynamic routing protocol on either or both of the interfaces. Also the description of the interfaces suggests that there is a LAN and a WAN for Railtel and for Reliance. Is there any intention that traffic from one LAN should go out the associated WAN? If so then perhaps some Policy Based Routing may provide what is looked for. Can the original poster provide some clarification?

HTH

Rick