IBM 2212: Network layout
The support of the Expedited Forwarding PHB on the IBM 2212 has been tested in terms of one-way delay and instantaneous packet delay variation (ipdv).
Such tests have been carried out in the local area, by enabling a policer in the ingress interface and SCFQ on the egress interface of the IBM 2212 (PPP interface). The network topology is illustrated in figure 1.
Figure 1: network topology for EF time performance validation on the IBM 2212 platform when deployed in the local area.

The IBM 2216 is transparent from the QoS point of view, in the sense that no QoS features is inabled on that router.

The SmartBits 200 is deployed both as source and receiver of EF traffic: traffic is generated from a FastEthernet interface and sinked to second FastEthernet card of the same box at a constant rate equal to 300 Kbps. Best-effort traffic deployed a couple of Sun Ultra (Solaris 2.7) as source and receiver.
Both premium (EF) and best-effort strams are unidirectional.
FastEthernet was deployed in duplex mode in order to avoid any effect of collisions on measurements.

The operating system version of the IBM 2212 deployed in these tests is the 3.3.
The test has been carried out by deploying the default EF configuration with the exception of the premium buffer size (PBS) which was a parameter of the test. The premium queue weight was also constant (90%, the default value).

Last modified: Nov 23, 1999