*sigh* There is no longer such a thing as a class C. There are /24
prefixes. Anyone who plans to do BGP routing _must_ understand the
difference, and why classful references are undesirable.
One thing that has not been mentioned is where the address space
comes from -- is it provider-assigned, provider-independent, or has
this not yet been dealt with? This will make a MAJOR difference in
routing design.
Failover and load balancing, with respect to the Internet, are
different problems. If the concern with load balancing is to
optimize bandwidth utilization and minimize queueing (i.e., spreading
the traffic to hosts), the results are likely to be MUCH better with
using multiple links to the same provider. Assuming the address
space is assigned by that provider, you would advertise both the
more-specific and aggregate at each POP, and mark the routes with the
NO-EXPORT community. See the archives for more detailed discussions,
or RFC1998.
By going to two different providers, a rule of thumb is that 30 to 40
percent of queries sent to one provider will have the response
returned via the other provider. This is not something you can
prevent, especially with a small address space.
Load balancing is a technique. What problem are you trying to solve?
>isp ..prefer to anounce a class full c rather than chunks of it ..it
>woul make it
>dificult for other isp managing this scenario....anyways everyone
>wants to reduce
>routing tables and anouncing a whole class c is easy.
>
>
>Ruihai An wrote:
>
>> Hi, All,
>>
>> Here is a quick question:
>> We are planning to run BGP over two ISP links to provide loading balance.
>> But we were told that we will run into major problems if we do not have full
>> class Cs on both ends.
>>
>> Could somebody make comment on this?
>>
>> Thanks
>>
>> Ruihai
>>
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