MPLs Link load balancing on cisco 2900 router

[MuthukumarParamasivan43009]

HI team,,

              We have two MPLS links and 4 Mbps bandwidth speed for each links. Both links are terminated on single router and Router model 2960 series. We want utilize for both links means load balancing will be happened between two links. Please suggest on this.

Regards

Muthukumar

[Giuseppe Larosa]

Hello ,

if links are same speed

you can use:

ECMP   Equal Cost Multi Path

startiing from two static routes or using a dynamic routing protocol like OSPF or EIGRP

You get per flow load balancing a given IP SA, IP DA will use a single link .

Multiple flows with varied sources and destinations will use either link1 or link2 achieving flow based load balancing

Hope to help

Giuseppe

[MuthukumarParamasivan43009]

Hi ,

      Our management preference static routes for this activity so could your share the configuration example?

Thanks

Muthukumar

[balaji.bandi]

How is other side connected same Single Router or dual Router ? 

If you can use IGP Like OSPF they do autmatic Load-balance if the Links are equal, if they are un-equal ( if both cisco device - you can use EIGRP).

Looks some guide lines :

https://blog.ipspace.net/2013/04/load-balancing-across-multiple-mplsvpn.html

[MuthukumarParamasivan43009]

HI Team,

                Is it possible without routing protocol ?

Thanks

Muthukumar

[balaji.bandi]

You can do Static Route (but i do not like to advise that)

[MuthukumarParamasivan43009]

HI,

           Pl. find the ip address details for your reference and suggest for load balancing configuration

Site1:

2960 Router is available and this one of the branch location

MPLS links 1

------------

ip address 172.19.2.97 255.255.255.252

MPLS Link 2

-----------

ip address 10.43.191.57 255.255.255.252

LAN

---

10.9.24.1 255.255.255.0
10.9.124.1 255.255.255.0

Site2:

------

MPLS Link1

--------

172.22.97.69 255.255.255.252

MPLS Link2:

----------

10.43.186.245 255.255.255.252

LAN

---

10.9.16.3/23
13. 10.9.116.1/23

Thanks

Muthukumar

[Giuseppe Larosa]

Hello Muthukumar

on site 1:

ip route 10.9.16.0 255.255.254.0 172.19.2.98

ip route 10.9.16.0 255.255.254.0 10.43.191.58

+

ip route 13.10.8.0 255.255.254.0 172.19.2.98

ip route 13.10.8.0 255.255.254.0 10.43.191.58

Similary on site2:

ip route 10.9.24.0 255.255.255.0 172.22.97.70

ip route 10.9.24.0 255.255.255.0 10.43.186.246

+

ip route 10.9.124.0 255.255.255.0 172.22.97.70

ip route 10.9.124.0 255.255.255.0 10.43.186.246

However, these are MPLS L3 VPN services as the subnets of the links are different on the two sites.

You need to communicate to each MPLS SP your local LAN subnets in each site  to make this to work.

Hope to help

Giuseppe

[balaji.bandi]

Both side single router ? Same MPLS Provider ? then follow other suggestion done in the other post. by @ Giuseppe Larosa

[MuthukumarParamasivan43009]

HI,

Both side single router and same ISP provider.

Thanks

Muthukumar

[balaji.bandi]

i would advise to go with IGP with OSPF simple to deploy and it automatically take care of your requirement, Static is more painfull and blackhole the traffic - if one of the link Failes, you need also IP sla to track to shutdown the links so on, how administration task you like to put for static routes.

[MuthukumarParamasivan43009]

Hi,

       Could you share the sample configuration of load balancing  & Auto failover with IGP protocol asap..

Thanks

Muthukumar

[balaji.bandi]

This gives you a high-level config of how you can do LB: You can fine-tune based on the outcome and testing.

http://gponsolution.com/ospf-load-balancing-example.html

[Giuseppe Larosa]

Hello BB,

I agree that using an IGP is a better solution but also this choice has to be made with the MPLS SP as this looks like to be an MPLS L3 VPN service.

The peer for OSPF is the PE node not the remote CE node so coordinate effort is needed between customer and SP.

Hope to help

Giuseppe

[balaji.bandi]

@Giuseppe Larosa

I was in impression this was Layer2 VPN Delivery, but may be missed here, if they are Layer3 VPN ?  (user need to confirm) -we advised based on the information.