Re: Bandwidth

 I have done something similar to that with 3 ISP's. I have a router
connecting to each ISP, and a 3560 connecting the 3 LAN interfaces of the
routers. On each router I run a static default route to the PE router. I
then put 3 static default routes on the 3560 each pointing to one of the 3
routers. I then do IP SLA on the 3560 , and track 3 static default routes
 to each router. I track the icmp of the ISP router PER (far end) and if
ping fails the default route to that ISP goes away. Most of the thinking and
work is done on the 3560 as it tracks reachability on the ISP ends. I get
nearly even traffic flow across all 3 ISP's. One thing to keep in mind is
your Firewall placement and advertised ranges to your ISP's. Depending on
what your doing on your advertisements and your firewalls you could have
some tricky NAT's going on.

    |------R1----ISP1
3560---R2 ---ISP2
    |-------R3---ISP3

3560 config
============
track 1 rtr 1 reachability
!
track 2 rtr 2 reachability
!
track 3 rtr 3 reachability

ip sla 1
 icmp-echo 4.1.1.1
 timeout 3000
 threshold 1000
 frequency 10
ip sla schedule 1 life forever start-time now
ip sla 2
 icmp-echo 4.2.2.2
 timeout 3000
 threshold 1000
 frequency 10
ip sla schedule 2 life forever start-time now
ip sla 3
 icmp-echo 4.3.3.3
 timeout 3000
 threshold 1000
 frequency 10
ip sla schedule 3 life forever start-time now

ip route 0.0.0.0 0.0.0.0 1.1.1.1 name ###DEFAULT_ROUTE_TO_R3### track 1
ip route 0.0.0.0 0.0.0.0 2.2.2.2 name ###DEFAULT_ROUTE_TO_R1### track 2
ip route 0.0.0.0 0.0.0.0 3.3.3.3 name ###DEFAULT_ROUTE_TO_R2### track 3
ip route 4.1.1.1 255.255.255.255 1.1.1.1 name
##USED_TO_TRACK_ISP1_STATUS_ON_R1###
ip route 4.2.2.2 255.255.255.255 2.2.2.2 name
##USED_TO_TRACK_ISP2_STATUS_ON_R2###
ip route 4.3.3.3 255.255.255.255 3.3.3.3 name
##USED_TO_TRACK_ISP3_STATUS_ON_R3###
======================

HTH
Christopher

On Mon, Apr 18, 2011 at 2:46 PM, sameer inam <i_sameer_at_hotmail.com> wrote:

> the whole point of that thing is , will have Two WAN links with two
> different
> ISPs , which basically do the load balancing , In this case if One link
> goes
> down then Traffic will use the other link and if the other link goes down
> then Traffic route to another link .. like 99 % up time...
>
>
>
>
>
> Date: Mon, 18 Apr 2011 19:15:56 +0300
> Subject: Re: Bandwidth
> From: baker.garry_at_gmail.com
> To: i_sameer_at_hotmail.com
> CC: ccielab_at_groupstudy.com
>
> backup interface tracking the interface load...
>
>
> http://www.cisco.com/en/US/customer/docs/ios/dial/configuration/guide/dia_bac
> kup_serial_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1000929
>
>
> not sure why you would only want to use one then the other and not just
> equal
> cost load balance or other solution such as OER/PfR even if you want to get
> new and advanced...
>
> need to know more details and what the end game is...
>
> --
> Garry L. Baker
>
> "With sufficient thrust, pigs fly just fine..." - RFC 1925
>
>
>
> On Mon, Apr 18, 2011 at 5:04 PM, sameer inam <i_sameer_at_hotmail.com> wrote:
>
> Gents,
> could you please help on that , I have two WAN links on one router , 2 MB
> each ... what I want is if my traffic reach 2 MB it will automatically
> revert
>
> to second link and if the 2nd link reach 2 MB then it will shift to 1st
> link
> ....can any one help me on that ..
>
> Kind regards,
> Sameer
>
>
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-- 
Christopher D. Copley
copley.chris_at_gmail.com
859-322-2310
Blogs and organic groups at http://www.ccie.net