Policy-based routing is evil? Discuss.

Fri Oct 11 18:05:42 UTC 2013

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Le 11/10/2013 19:41, joel jaeggli a écrit :
>
> On Oct 11, 2013, at 10:27 AM, William Waites <wwaites at tardis.ed.ac.uk>
wrote:
>
>> I'm having a discussion with a small network in a part of the world
>> where bandwidth is scarce and multiple DSL lines are often used for
>> upstream links. The topic is policy-based routing, which is being
>> described as "load balancing" where end-user traffic is assigned to a
>> line according to source address.
>>
>> In my opinion the main problems with this are:
>>
>>  - It's brittle, when a line fails, traffic doesn't re-route
>
> it's brittle
>
>>  - None of the usual debugging tools work properly
>>  - Adding a new user is complicated because it has to be done in (at
>>    least) two places
>>
>
> you take all the useful information that an IGP could be (or is)
providing you, and then you ignore it and do something else.

I like that phrase. ;-)

mh
>
>
>> But I'm having a distinct lack of success locating rants and diatribes
>> or even well-reasoned articles supporting this opinion.
>>
>> Am I out to lunch?
>
> evil is not a synonym for ugly patch placed over a problem that could
be handled better. If it's being used as an alternative to VRF, it isn't.
>
>>
>> -w
>> --
>> The University of Edinburgh is a charitable body, registered in
>> Scotland, with registration number SC005336.
>

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