From: Akber Ali Mirza (akberali.cisco@gmail.com)
Date: Sun Dec 21 2008 - 13:20:32 ARST
Dear Mujeeb,
My Sincere thanks for your Great explanation! ( I couldn't have get better
than this!)
Could you plz help me in building the configurations for my both scenarios.
Thanks to John/Richard for your valuable explanation.
I really looking forward to try this scenarios in my Lab .
Many Thanks!
Akber
On Sun, Dec 21, 2008 at 11:52 AM, Mujeeb Sarwar <mujeebsarwar@gmail.com>wrote:
>
> 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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>> > >>
>> > >>
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