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Load Balancing ISP WAN

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rishad ahammed
Level 1
Level 1

‎05-18-2016 01:17 AM - edited ‎03-05-2019 04:02 AM

We have two tier 1 Upstream providers.  ISP-1 and ISP-2 . We are advertising Subnet-A to ISP-1 and Subnet-B to ISP-2.  We have BGP neighbourship with Both of them. But we are recieving only default route from upstream providers. 

We have already done load balancing for inbound traffic with autofailover.

We want to push the outbound traffic from Subnet-A to ISP-1 and traffic from Subnet-B to ISP-2 with auto failover. We are stuck here since we are recieving only default route from our upstream.

We can achieve this using PBR but in that case auto failover will not happen. 

We are using seperate WAN router from each upstream.

Kindly Advice

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Carlos Villagran
Cisco Employee
Cisco Employee
In response to rishad ahammed

‎05-19-2016 05:36 AM

Hi!

If a link which is directly connected goes down you can use an IP SLA to ping the destination constantly and if there is no response (the ping fails at some point) the traffic will switch to the destination in the routing table (as a failover).

For this you will need a tracking object and know how to configure an IP SLA. Please refer to the following link for configuration details:

It is a Nexus documentation but is almost the same in all other platforms.

http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/6_x/nx-os/IPSLA/configuration/guide/b_Cisco_Nexus_7000_Series_NX-OS_IP_SLAs_Configuration_Guide_rel_6-x/b_Cisco_Nexus_7000_Series_NX-OS_IP_SLAs_Configuration_Guide_rel_6-x_chapter_01000.html

If you have any doubt in the documentation or how to implement it, let me know.

Hope it helps, best regards!

JC

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Carlos Villagran
Cisco Employee
Cisco Employee

‎05-18-2016 06:04 AM

Hi!

Do you have 2 routers connected to 2 ISPs or only 1 router connected to both ISPs?

Be aware though, if PBR fails (the next-hop configured in the route-map is not reachable) the router will keep forwarding the traffic based in the routing table normally, the traffic will not get dropped or such.

Best regards!

JC

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rishad ahammed
Level 1
Level 1
In response to Carlos Villagran

‎05-19-2016 02:20 AM

yes. We are using 2 routers. What we can do if some uplink which is not directly connected went down

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Go to solution
Carlos Villagran
Cisco Employee
Cisco Employee
In response to rishad ahammed

‎05-19-2016 05:36 AM

Hi!

If a link which is directly connected goes down you can use an IP SLA to ping the destination constantly and if there is no response (the ping fails at some point) the traffic will switch to the destination in the routing table (as a failover).

For this you will need a tracking object and know how to configure an IP SLA. Please refer to the following link for configuration details:

It is a Nexus documentation but is almost the same in all other platforms.

http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/6_x/nx-os/IPSLA/configuration/guide/b_Cisco_Nexus_7000_Series_NX-OS_IP_SLAs_Configuration_Guide_rel_6-x/b_Cisco_Nexus_7000_Series_NX-OS_IP_SLAs_Configuration_Guide_rel_6-x_chapter_01000.html

If you have any doubt in the documentation or how to implement it, let me know.

Hope it helps, best regards!

JC

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rishad ahammed
Level 1
Level 1
In response to Carlos Villagran

‎05-22-2016 05:58 AM

Thank you very much. This information is really helpful.

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