using TOS as a key in route cache

using TOS as a key in route cache

[Rajeev Bector]

Guys
 I am looking for a reason as to why we want
to have different route cache entries for
different IP ToS types. Does anyone have
any insight into this ?

thanks

-- Rajeev

(please cc replies to rajeev@akamai.com)

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Re: using TOS as a key in route cache

[Helge Hafting]

Rajeev Bector wrote:
> 
> Guys
>  I am looking for a reason as to why we want
> to have different route cache entries for
> different IP ToS types. Does anyone have
> any insight into this ?

Because you may want to route time-critical stuff like
video through a dedicated fast network and slow stuff like email
through another.  Such a setup prevents an email burst from 
disrupting video.

There are many similiar uses.

Helge Hafting
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Re: using TOS as a key in route cache

[Rajeev Bector]

Hello
 Thanks for your reply. But this can create problems
in some of the cases. For example, "scp" over TCP
starts with TOS 0, then goes to 8 (bulk data). What
happens is that when RTOs are cached, they are
updated for TOS 8 and not for TOS 0, therefore a
new connection does not pick up the cached RTO.

Does this make sense ?

Thanks,
-- Rajeev
(Again, please cc replies to rajeev@akamai.com)

On Mon, 4 Dec 2000, Helge Hafting wrote:

> Rajeev Bector wrote:
> > 
> > Guys
> >  I am looking for a reason as to why we want
> > to have different route cache entries for
> > different IP ToS types. Does anyone have
> > any insight into this ?
> 
> Because you may want to route time-critical stuff like
> video through a dedicated fast network and slow stuff like email
> through another.  Such a setup prevents an email burst from 
> disrupting video.
> 
> There are many similiar uses.
> 
> Helge Hafting
> 

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