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64 Metro Ethernet Routing Switch 8600 modules
The 8691SF/256 (DS1404090) is functionally identical to the 8691SF except
it has 256 MB of synchronous dynamic random access memory (SDRAM)
installed. The 8691SF/256 is identified by the front panel model number
label in the upper right corner as 8691SF/256.
You can use the 8691SF as a Metro Ethernet switch fabric with the
appropriate memory upgrade. See Installing a CPU Memory Upgrade
(314832-D) for instructions for upgrading CPU memory.
The 8691omSF module consists of a printed circuit board with status LEDs,
a management port, a DCE/DTE switch for the console port, a console port,
a modem port, a reset button, and a PC Card slot.
The CPU subsystem uses a PowerPC CPU and has 256 MB of SDRAM.
The 8691omSF module contains 16 MB of onboard flash memory used to
store the image file, and 2 MB of boot memory (ROM).
The routing switch fabric uses 10 MB of shared, high-speed memory. This
memory buffers traffic destined for I/O modules. The switch logic allocates
memory to the various switch priority queues according to traffic usage and
current switch configuration.
In all 8000 series chassis other than the 8003 chassis, you can install a
8691omSF module in both slots 5 and 6 of the chassis to enable redundant
operation. The redundant module in slot 6 can assume the processing
duties of a failing primary 8691omSF module in slot 5.
When the 8691omSF module in slot 6 completes initialization, it relearns the
routing and VLAN bridging information for the switch unless the HA-CPU
flag is enabled. If HA-CPU is enabled, the static routes and ARP entries
for routing are synchronized to the redundant CPU, which results in no
interruption of network services.
The two 8691omSF modules share switch fabric functions for the switch. If
one 8691omSF module fails, the system reverts to operation with a single
8691omSF module.
Note that when the Metro ESM 8668 module is installed, the HA-CPU flag
is not supported.
"8691omSF module LEDs" (page 65) shows the location of the 8691omSF
module LEDs.
Nortel Metro Ethernet Routing Switch 8600
Installation — Modules
NN46220-306 02.02 Standard
4.2 7 July 2008
Copyright © 2005-2007, Nortel Networks
.