Avaya 8800 Installation Manual page 26

Avaya Ethernet Routing Switch 8800/8600 module fundamentals
Figure 1: Ethernet Routing Switch 8800/8600 R module ingress and egress packet flow
The ingress RSP2 executes lookups, performs filtering and classification operations, and
modifies the IP and MAC headers within the body of the packet to reflect routing and switching
decisions.
The RSP2 determines the information the fabric needs to carry the packet to the correct egress
point and also determines the physical egress port. As part of the lookup process, it can also
determine and record the egress queue ID and pass it to the egress RSP2.
Encapsulation is the most significant egress operation that the RSP2 performs. To specify the
egress queue, the queuing and traffic shaping functions use the following:
• encapsulation information from the egress RSP2
• MAC and IP packet headers
• Quality of Service (QoS) markings
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The F E egress ASIC supports the FFE QoS that includes queuing and selection, traffic
shaping, and interfacing to other similar R modules. Similarly, the F
packet policing and marking.
Each DPM also consists of the following:
• one Fast TAPmux (FTAP) interface to the fabric modules
• one Feedback Output Queueing (FOQ) Manager Field-Programmable Gate Array
(FPGA)
26 Installation — Modules
Comments? infodev@avaya.com
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I ingress ASIC provides
October 2014