How to configure load balancing on cisco 6509 switch between two different ISP P2P link

[tuhinbhowmick]

Hi,

We have two 100 MBPS P2P link from two different ISP and we have terminated both the link on our 6509 switch. Now we want to configure the load balancing between these two disfferent ISP 100 MBPS P2P link.

So, how to go and what all options we can try ? We are thinking for Ether Channel configuration. Need your expert opinions on the same and if etherchannel configuration is the option then what would be the configuration for the same ?

Regards,

TB

[Giuseppe Larosa]

Hello Tuhin,

use two routed L3 links with /30 IP subnets and you will get  flow based CEF load balancing (ECMP equal cost multi path)

For etherchannel to work both links have to be terminated on the same device on the remote end.

In case using LACP is recommended ( channel-group N mode active) in this way LACP control frames travel on all member links checking their health status

Hope to help

Giuseppe

[tuhinbhowmick]

Hi,

Thanks for your information.

FYI, both the linkn has been terminated on the same device only at remote end only as we are managing the remote end as well. Also, it is completely a L2 path.

So, we have hard coded 100 MBPS full duplex both end for both the ISP and when we put those ISP link on trunk at a time it is working fine abd so far we are able to spna all our VLAN from our side to remote end.

Now waht we want is to bundle both the link so that we can get 200 mbps pipe and as well as load balancing should happen.

Kindly, let me know if you need any further information from my side.

Regards,

TB

[Giuseppe Larosa]

Hello Tuhin,

if the service is L2 and you want to extend your Vlans over it you need a L2 etherchannel.configured as a trunk

First of all, member links need to be configured in the same way for speed, duplex, trunk encapsulation, native vlan. list of vlan permitted on trunk

interface gix/y

switchport

switchpot trunk enc dot1q

swichport mode trunk

speed 100

duplex full

!

interface gik/h

switchport

switchpot trunk enc dot1q

swichport mode trunk

speed 100

duplex full

!

At this point you can configure the aggregate on your side using

interface gix/y

channel-group 5 mode active

interface gik/h

channel-group 5 mode active

Do the same on both ends, channel-group number don't need to match, it has to be an unused group check with

show etherchannel summary

what bundles exist in your system

Hope to help

Giuseppe

[Alessio Andreoli]

If you need real load balancing implement PFR,

otherwise for load sharing the guys already told you how...

Take Care

Alessio