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Ethernet Routing Switch 8600 module fundamentals
Release 3.x module feature set
Each Ethernet Routing Switch 8600 interface module for Release
3.x consists of a Backplane Forwarding module (BFM) with common
application specific integrated circuits (ASIC). These ASICs provide the
forwarding engine and local storage of Layer 2 to 4 forwarding tables.
Each forwarding engine provides lookups, resolves addresses, and sends
packets through the switch fabric (SF) to a destination port without CPU
intervention. The forwarding engine also filters packets using current
prioritization policies and can assign prioritization information in the internal
packet header.
The BFM is equipped with eight priority queues for each port. You can use
either of the following two prioritization schemes:
•
Strict priority
•
Weighted Round Robin (WRR)
Strict priority queueing guarantees that the switch sends the highest
priority packets first. WRR gives priority based on a round robin algorithm.
Output buffer memory consists of 8 megabytes (MB) of memory allocated
to each Gigabit Ethernet port, or shared among the eight 10/100 ports.
Release 4.x module feature set
Each Ethernet Routing Switch 8600 R module for Release 4.x consists
of a Distributed Processing module (DPM) and a Port Interface Module
(PIM). The PIM consists of various Media Access Controls (MAC) and
Physical Layer Controls (PHY), and the physical interfaces for direct
network connections. A single PIM interconnects with a single DPM to
form a Ethernet Routing Switch 8600 module.
Modules with DPMs are R series modules. Ethernet Routing Switch 8600
modules that use the BFM are E or M modules.
Each DPM contains either two or three lanes depending on the module.
Both the 8630GBR and the 8683XLR modules consist of three lanes.
The 8648GTR module consists of two lanes. Each lane is also known as
a Flexible Forwarding Engine (FFE). The FFE lane is the basis for the
Ethernet Routing Switch 8600 R modules. The FFE lane consists of:
•
Two Flexible Route Switch Processors—ingress Route Switch
Processor 2 (RSP2) and egress RSP2
•
One egress packet handling ASIC- F
2
E
•
One ingress packet handling ASIC- F
2
I
Nortel Ethernet Routing Switch 8600
Installation — Modules
NN46205-304
02.02
Standard
16 June 2008
Copyright © 2008 Nortel Networks
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Summary of Contents for Passport 8600 Series
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