Mailing List Archive: question on equal paths load balancing

Hi Team

This may seem like a rather basic but am asking it anyways.... am a novice but can only learn by asking!! I have'nt really implemented this, but it did cross my mind so am checking.

I have 3 links in all connected to 2 upstream GRX providers and am peering with them using BGP. 2 links going to one GRX partner say partner A and 1 link going to partner B. All are 64 kbps links.

Now say I have to use partner A to connect to Europe and Partner B to connect to South East Asia.

Question:
1) Since I have 2 links to partner A, can I use both the links to do load balancing AS WELL AS maintain redundancy incase one fails?

2) I have one class C subnet that I will be exporting to both partners and will reach them depending on destination traffic viz Europe or Asia. I know I have to configure BGP policies for this... but for achieving load balancing between the 2 links do I have to configure BGP policies as well?? Can someone point out some example of this scenario?

I am new to BGP policies so want to be sure much before I actually start work.

Thanks in advance

// Bosco

Hello Bosco,

Get my Hutch GPRS working and I'll answer this for you
;-)

For (1), yes, though you'll have to co-ordinate with
provider A if you want this to be bi-directional.
Reference BGP multipath and EBGP multihop methods of
load-balancing, as well as exportorting a per-packet
load-balancing policy to the forwarding-options in
your Juniper peering router.

For (2), I don't know if you're talking about the same
two links to provider A?

Regards,
Lars Higham

--- Bosco Sachanandani
<Bosco.Sachanandani@orange.co.in> wrote:
> Hi Team
>
> This may seem like a rather basic but am asking it
> anyways.... am a novice but can only learn by
> asking!! I have'nt really implemented this, but it
> did cross my mind so am checking.
>
> I have 3 links in all connected to 2 upstream GRX
> providers and am peering with them using BGP. 2
> links going to one GRX partner say partner A and 1
> link going to partner B. All are 64 kbps links.
>
> Now say I have to use partner A to connect to Europe
> and Partner B to connect to South East Asia.
>
> Question:
> 1) Since I have 2 links to partner A, can I use both
> the links to do load balancing AS WELL AS maintain
> redundancy incase one fails?
>
> 2) I have one class C subnet that I will be
> exporting to both partners and will reach them
> depending on destination traffic viz Europe or Asia.
> I know I have to configure BGP policies for this...
> but for achieving load balancing between the 2 links
> do I have to configure BGP policies as well?? Can
> someone point out some example of this scenario?
>
> I am new to BGP policies so want to be sure much
> before I actually start work.
>
> Thanks in advance
>
> // Bosco
>
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