Nokia 7705 - 3.1.2.1 Ring Traffic

Quality of Service Guide QoS and QoS Policies
Edition: 01 3HE 11014 AAAC TQZZA 27
• access egress direction describes packets switched from the switch fabric
toward customer equipment
Figure 1 Egress and Ingress Traffic Direction
3.1.2.1 Ring Traffic
On the 2-port 10GigE (Ethernet) Adapter card and 2-port 10GigE (Ethernet) module,
traffic can flow between the Layer 2 bridging domain and the Layer 3 IP domain (see
Figure 2). In the bridging domain, ring traffic flows from one ring port to another, as
well as to and from the add/drop port. From the network point of view, traffic from the
ring towards the add/drop port and the v-port is considered ingress traffic (drop
traffic). Similarly, traffic from the fabric towards the v-port and the add/drop port is
considered egress traffic (add traffic).
The 2-port 10GigE (Ethernet) Adapter card and 2-port 10GigE (Ethernet) module
function as an add/drop card to a network side 10 Gb/s optical ring. Conceptually, the
card and module should be envisioned as having two domains—a Layer 2 bridging
domain where the add/drop function operates, and a Layer 3 IP domain where the
normal IP processing and IP nodal traffic flows are managed. Ingress and egress
traffic flow remains in the context of the nodal fabric. The ring ports are considered
to be east-facing and west-facing and are referenced as Port 1 and Port 2. A virtual
port (or v-port) provides the interface to the IP domain within the structure of the card
or module.
Note: Throughout this guide, the terms access ingress/egress and service ingress/egress
are interchangeable. This section (QoS Overview) uses the term access, and the following
sections (beginning with QoS Policies Overview) use the term service.
19763
Access Ingress Network Egress
Network IngressAccess Egress
Access Fabric
7705 SAR
Network
Customer