[e2e] end2end-interest Digest, Vol 18, Issue 9

[Joe Touch]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1



Alok wrote:
>>>>Personally, I am in great doubt at this.
>>>
>>RTT delay is influenced by the following factors:
>>
>>1. Speed of light delay in the path
>>2. Retransmissions in the underlay
>>3. Queues in buffers due to
>>    a. self queueing (queueing behind your own packets)
>>    b. queueing due to cross traffic
> 
> Do routers/ATM switches use queues for "congestion control" or because most
> of their cards and backplanes are asynchronous?

it depends on where the queues are:

input queues help more for asynch backplanes/cards, as well as
forwarding-based congestion (limits to header processing, e.g., for VPNs
terminating IPsec)

output queues are needed for output port contention congestion control,
i.e., where the output link is the limiting factor

Joe
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (MingW32)
Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org

iD8DBQFDBO7FE5f5cImnZrsRAmdoAJ45G5GBo1JicYaRFo6ZQaAMm2eCOACgq66y
zryzGiA8BDVfnDi//zugQM0=
=ydER
-----END PGP SIGNATURE-----