From: Mujeeb Sarwar (mujeebsarwar@gmail.com)
Date: Sun Dec 21 2008 - 04:22:58 ARST
Dear Akber,
Scenario 1
OUTBOUND Load balancing:
You can ask *ISP A* to originate a default route through BGP plus ask *ISP B
* to send partial BGP routes. So in this case traffic which would match with
specific routes will take ISP B path and rest of the traffic will take ISP
A. In this case you will achieve load balancing for OUTBOUND traffic.
If you are getting full BGP feed from both ISPs then you can use
'maximum-path 2' to install both routes in routing table.
INBOUND Load Balancing:
As per you requirement you want to recieve traffic for 10.1.1.0/24 (
Assuming that these are Public IP Subnets in actual and there would be
NATing on Firewall ) from one ISP and for 192.168.1.0/24 from other with
backup. For this you can advertise both of your subnets through BGP to both
ISPs and do *AS-PATH prepending* to make a subnet less preferable through
one ISP while providing backup as well in case of failure.
Scenario 2:
OUTBOUND Load Balancing:
Now in this scenario where you have 2 different Routers on which Internet
links are coming, outbound load balancing will depend upon traffic flow from
Firewall to Routers. Let say you are using GLBP between both Internet
Routers and firewall is forwarding traffic to gateway ( Virtual IP Address )
then traffic will be forwarded to both Routers from Firewall. Now in this
case you have option to recieve Default Route/Full BGP Routes/Partial Routes
from both ISPs.
Note that you can't use 'maximum-path' here because both internet links are
terminating on 2 different roouters.
INBOUND load Balancing:
Configuration options will remain same as 'Scenario 1' but you need
to configure static routes on both Routers for both subnets toward firewall
so that return traffic from Internet could be forwarded to firewall if
recieve from any of the Internet link.
Regards,
Mujeeb
On Sun, Dec 21, 2008 at 7:22 AM, darth router <darklordrouter@gmail.com>wrote:
>
> http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml
>
>
> On Sat, Dec 20, 2008 at 5:48 PM, Akber Ali Mirza
> <akberali.cisco@gmail.com>wrote:
>
> > John-
> >
> > Thanks for the valuable input.
> >
> > Can you tell how do i go ahead for configuring BGP loadbalancing in the
> > below scenario:-
> >
> >
> > Internal Network--------->> Internet Router A ------------>>ISP A
> > (10.1.1.0/24/ Internet Router B-------------->>ISP B
> > 192.168.1.1.0/24)
> > I want my 10.1.1.0 subnet to pass through only ISP A & 192.168.1.0 subnet
> > to
> > pass through ISP B.
> >
> > But If one ISP goes down traffic should be diverted to other traffic with
> > out diversion.
> >
> > Also one major reason why i am looking for Loadbalancing with Service
> > provider is
> > for example latency towards ISP A is very high , then let me know what
> > needs
> > to be done form my end on the Internet Routers. IS there any way we can
> > achieve this with out any changes on BGP.
> >
> > Any scenario with commands would help me a lot
> >
> > Cheers!
> >
> >
> >
> >
> > On Sun, Dec 21, 2008 at 5:38 AM, John <jgarrison1@austin.rr.com> wrote:
> >
> > > You could set the weight of the routes from both ISP's to the same
> value,
> > > but obviously if ISP A has a route that ISP B doesn't than you'll get
> no
> > > load sharing for that route
> > > ----- Original Message ----- From: "Akber Ali Mirza" <
> > > akberali.cisco@gmail.com>
> > > To: "John" <jgarrison1@austin.rr.com>
> > > Cc: <ccielab@groupstudy.com>
> > > Sent: Saturday, December 20, 2008 4:00 PM
> > >
> > > Subject: Re: BGP Loadsharing
> > >
> > >
> > > John -
> > >>
> > >> My Questionhere is as follows below .
> > >>
> > >> Internal Network 2 subnets----Internet Router ----connected
> > >> to-------->ISPA
> > >> & ISP B service
> > >> Provider.
> > >> ( ISP BW =2 mb each)
> > >>
> > >> How do i perform Loadsharing using BGP on my internet router ?
> > >> ( How both the links will be utilized by using BGP in this scenario )
> > >>
> > >> Cheers!
> > >>
> > >>
> > >> On Sun, Dec 21, 2008 at 2:02 AM, John <jgarrison1@austin.rr.com>
> wrote:
> > >>
> > >> You really don't provide enough information to answer the question.
> If
> > >>> your running BGP as your igp you can set one of the appropriate
> > community
> > >>> attributes on both ingress routers and send-community to your ibgp
> > peers.
> > >>> As
> > >>> far as return paths that would depend on what your outside addresses
> > are
> > >>> and
> > >>> how their being advertised by your ISP's.
> > >>>
> > >>> How does the internal network make routing decisions? You really
> don't
> > >>> want router A or B making the load sharing desciscion, so unless you
> > >>> really
> > >>> are running BGP as your igp your looking at the wrong solution
> > >>> ----- Original Message ----- From: "Akber Ali Mirza" <
> > >>> akberali.cisco@gmail.com>
> > >>> To: <ccielab@groupstudy.com>
> > >>> Cc: <akberali.cisco@gmail.com>
> > >>> Sent: Saturday, December 20, 2008 12:47 PM
> > >>> Subject: Re: BGP Loadsharing
> > >>>
> > >>>
> > >>> Hi Experts,
> > >>>
> > >>>>
> > >>>> Please provide your valubale help on the below query.
> > >>>>
> > >>>> Thanks ,
> > >>>> Akber.
> > >>>>
> > >>>> On Sat, Dec 20, 2008 at 2:33 AM, Akber Ali Mirza
> > >>>> <akberali.cisco@gmail.com>wrote:
> > >>>>
> > >>>> Hi Experts,
> > >>>>
> > >>>>>
> > >>>>> Please help me in configuring BGP Load balancing. { Sorry from
> > >>>>> Diverting
> > >>>>> from the CCIE forum }
> > >>>>>
> > >>>>>
> > >>>>> Scenario1:-
> > >>>>> 192.168.1.0/24 Vlan 10 ------->
> > >>>>> 10.0.1.0/24 Vlan 20 ------> both vlan levaraging CoreSwitch
> > >>>>> ----->
> > >>>>> F/W ---> Internet Router -------> ISP A 2MB
> > >>>>>
> > >>>>> ------->
> > >>>>> ISP B 2MB
> > >>>>>
> > >>>>> Scenario2:-
> > >>>>> 192.168.2.0/24 Vlan 10 ------->
> > >>>>> 10.0.2.0/24 Vlan 20 ------> both vlan levaraging CoreSwitch
> > >>>>> ----->
> > >>>>> F/W ---> Internet Router A -------> ISP A 2MB
> > >>>>>
> > >>>>> Internet
> > >>>>> Router B ------> ISP B 2MB
> > >>>>>
> > >>>>> Requirement:- How do i configure Load balancing using BGP for
> which
> > >>>>> both
> > >>>>> my vlans should use Service Provider A& B on a Load Balancced
> > purpose.
> > >>>>> Please share me the best industry standards as well.
> > >>>>>
> > >>>>> Also please explain me how the return traiffc will reach into my
> > >>>>> network.
> > >>>>>
> > >>>>> Thanks in Advance!
> > >>>>> Akber.
> > >>>>>
> > >>>>>
> > >>>>
> > >>>> Blogs and organic groups at http://www.ccie.net
> > >>>>
> > >>>>
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> > >>
> > >>
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