Management Switch Modules - Extreme Networks BlackDiamond 6804 Troubleshooting Manual

packet memory for temporary storage. Based on the information in memory, such as the FDB, the
address filtering and queue management ASIC makes a forwarding decision. If the next hop is a local
port (on the same module), the packet is forwarded to the external MAC and PHY for the exit port. If
the packet is destined for another module (as either slow path traffic or fast path traffic), the packet is
transferred to the internal MAC and then on to the MSM (CPU).
All I/O modules share the management bus on the backplane, and use it to communicate to each other
and to the MSMs.

Management Switch Modules

As its name indicates, the Management Switch Fabric Module (MSM) serves a dual role in the system: it
is equipped to act as the internal switch fabric for data that is being transferred between I/O modules
in the chassis, and to handle the upper-layer processing and system management functions for the
switch. (See Figure 4.)
Figure 4: BlackDiamond MSM architecture (MSM64i shown)
CPU
Subsystem
CPU
CPU
256 MB
DRAM
Flash
NVRAM
PCMCI
Slot
An MSM is equipped with the following hardware components: CPU subsystem (dual CPUs, DRAM,
NVRAM, flash memory, and PCMCIA slot) and switch fabric subsystem (Quake ASICs, OTP, PQ, and
VPST RAM, packet memory and FDB SRAM, Twister ASICs, PBUS, and MAC ASICs).
Advanced System Diagnostics and Troubleshooting Guide
MSM64i (64 Gb Fabric)
SE
AFQM
ASIC
ASIC
SE
ASIC
OTP RAM
SE
PQ RAM
ASIC
VPST RAM
SE
ASIC
SE
ASIC
AFQM
SE
ASIC
ASIC
SE
OTP RAM
ASIC
PQ RAM
SE
ASIC
VPST RAM
MAC
MAC
MAC
MAC
MAC
MAC
MAC
MAC
PBUS
DN_027B
The BlackDiamond Systems
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