From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Mon Jan 05 2004 - 13:59:49 GMT-3
At 3:00 AM -0500 1/5/04, <arvindyadav@comcast.net> wrote:
>I always prefer hub router or the router which has direct connectivity to
>clients.
>
>Arivnd
This is probably a good answer for the lab itself.
For the real world, some other considerations apply. First, you will
often have double-hub-and-spokes so a single reflector failure
doesn't bring down the cluster.
Second, you'll want to read and understand RFC 3544 on the BGP
Persistent Route Oscillation condition. There are a fair number of
circumstances where it may be wise to do a full mesh inside the
cluster, although only the reflectors need also to be in the general
iBGP mesh. In fairness, there are circumstances where you can do
other things to protect against oscillation.
Third, if you are doing a partial mesh and have routers of different
processor power, use the routers with the fastest processors as
reflectors, with the caveat that a client with more than 20 or so
peers needs a fast processor. That number is a rule of thumb, and
you can get away with more if there isn't much policy and they don't
take full routes. Still, maintaining a TCP session eats up a lot of
processor resources.
>
>----- Original Message -----
>From: "Paul Chen" <cpjchen@starhub.net.sg>
>To: <ccielab@groupstudy.com>
>Sent: Monday, January 05, 2004 1:25 AM
>Subject: Choosing a BGP route reflector
>
>
>> Hi Everyone,
>>
>> Does anyone know how to decide on which router to choose as a route
>> reflector in any given AS ?
>>
>> In all the all labs I have done so far, instructions have always been
>given
>> as to which router to use a RR. So , I never really understood the
>> selection process for a RR.
>>
>> I have not been able to find any explanations on why certain routers are
> > chosen over others .
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