RE: BGP Multi-homing

PBR sounds like a solution in search of problem;

Ergh

Wont Cisco learn?

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of Jian Gu
Sent: Thursday, July 09, 2009 1:24 PM
To: olumayokun fowowe
Cc: Johnny Phan; Scott Morris; Cisco certification
Subject: Re: BGP Multi-homing

Problem with PBR solutions is that PBR can not detect BGP failure, as
long as nexthop is reachable, traffic will be blindly forwarded. For
example, if ISP1's peering router BGP fails for whatever reason, and
it stops advertising default-route to you, you will be still sending
traffic originated from ISP1 address to ISP1, and traffic will be
blackholed.

I think the better way is to get full or partial internet feed from
them and than tweak weight/local preference with route maps.

On Thu, Jul 9, 2009 at 5:03 AM, olumayokun fowowe<olumayokun_at_gmail.com> wrote:
> Thanks all,
>
> I guess I will go with Scott's advice on PBR. I have simulated this and it
> seems to achieve just what I want.
>
> Regards,
> 'Mayokun
>
>
> On 7/7/09, Johnny Phan <johnny_d_phan_at_hotmail.com> wrote:
>>
>> Thanks for clarifying Scott.
>>
>> Basically I work for a Saas where they get have two ISPs, each with
>> different commit cost and bursting cost. The basic idea is to have BGP be
>> intelligent enough so it will use the commit of both circuits before
>> bursting, incurring extra charge. So it is more sharing than balancing, but
>> sharing intelligently. We are also an ISP passing on the full internet
>> route, so it will be interesting to find out how taxing this feature will be
>> on the router.
>>
>> Sorry, I didn't mean to steal the thread, but thought it might help.
>>
>> I look forward to your report Luan. Thanks.
>>
>> ----- Original Message ----- From: "Scott Morris" <smorris_at_ine.com>
>> To: "Johnny Phan" <johnny_d_phan_at_hotmail.com>
>> Cc: "olumayokun fowowe" <olumayokun_at_gmail.com>; "Cisco certification" <
>> ccielab_at_groupstudy.com>
>> Sent: Tuesday, July 07, 2009 1:57 PM
>> Subject: Re: BGP Multi-homing
>>
>>
>> I suppose that all depends on what your answer about "balance" versus
>>> "share" is. Is 1:1 traffic-share actually a balance between the two?
>>>
>>> OER is about optimization not about balancing per se (unless you do
>>> already) PfR is a theorhetical concept, but a nice one. But either
>>> path you take, how well it operates depends on your definitions and
>>> perceptions of the above two terms!
>>>
>>> I can give you two paths to go. How often to take either, or what you
>>> take on either is a different story.
>>>
>>> Understand your options and build accordingly!
>>>
>>>
>>>
>>>
>>> *Scott Morris*, CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider) #4713,
>>>
>>> JNCIE-M #153, JNCIS-ER, CISSP, et al.
>>>
>>> JNCI-M, JNCI-ER
>>>
>>> evil_at_ine.com
>>>
>>>
>>> Internetwork Expert, Inc.
>>>
>>> http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
>>>
>>> Toll Free: 877-224-8987
>>>
>>> Outside US: 775-826-4344
>>>
>>>
>>> Knowledge is power.
>>>
>>> Power corrupts.
>>>
>>> Study hard and be Eeeeviiiil......
>>>
>>>
>>>
>>> Johnny Phan wrote:
>>>
>>>> I keep seeing the response as there's no way to load balance, only
>>>> load sharing.
>>>>
>>>> Has anyone been able to use OER or PFR successfully ?
>>>>
>>>> ----- Original Message ----- From: "Scott Morris" <smorris_at_ine.com>
>>>> To: "olumayokun fowowe" <olumayokun_at_gmail.com>
>>>> Cc: "Cisco certification" <ccielab_at_groupstudy.com>
>>>> Sent: Monday, July 06, 2009 8:38 AM
>>>> Subject: Re: BGP Multi-homing
>>>>
>>>>
>>>> For outbound, just use PBR. That way, one of your subnets (source) goes
>>>>> to ISP1 and the other goes towards ISP2. Very simplistic.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> *Scott Morris*, CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider) #4713,
>>>>>
>>>>> JNCIE-M #153, JNCIS-ER, CISSP, et al.
>>>>>
>>>>> JNCI-M, JNCI-ER
>>>>>
>>>>> evil_at_ine.com
>>>>>
>>>>>
>>>>> Internetwork Expert, Inc.
>>>>>
>>>>> http://www.InternetworkExpert.com <http://www.internetworkexpert.com/>
>>>>>
>>>>> Toll Free: 877-224-8987
>>>>>
>>>>> Outside US: 775-826-4344
>>>>>
>>>>>
>>>>> Knowledge is power.
>>>>>
>>>>> Power corrupts.
>>>>>
>>>>> Study hard and be Eeeeviiiil......
>>>>>
>>>>>
>>>>>
>>>>> olumayokun fowowe wrote:
>>>>>
>>>>>> Hello all,
>>>>>>
>>>>>> I am multi-homing to the internet via two ISPs, and both of them are
>>>>>> sending
>>>>>> just default routes to me. I have two blocks of IPs that I am
>>>>>> advertising to
>>>>>> the internet. The challenge I am having is tweeking BGP so that
>>>>>> traffic from
>>>>>> a particular block use ISP1 while traffic from the other block of IP
>>>>>> should
>>>>>> use ISP2. I have been able to tweek inbound traffic from the
>>>>>> internet but I
>>>>>> am having issues with the outbound traffic because of the fact that
>>>>>> Iam just
>>>>>> receiving default routes from the providers. Does anyone have a
>>>>>> solution for
>>>>>> me?
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Olumayokun
>>>>>>
>>>>>>
>>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>>
>>>>>> _______________________________________________________________________
>>>>>> Subscription information may be found at:
>>>>>> http://www.groupstudy.com/list/CCIELab.html
>>>>>>
>>>>>
>>>>>
>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>
>>>>> _______________________________________________________________________
>>>>> Subscription information may be found at:
>>>>> http://www.groupstudy.com/list/CCIELab.html
>>>>>
>>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
>>> _______________________________________________________________________
>>> Subscription information may be found at:
>>> http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Thu Jul 09 2009 - 15:18:37 ART