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Rights clause at FAR sec. 52.227−19 and subparagraph (c) (1) (ii) of the Rights
in Technical Data and Computer Software clause at DFARS sec. 252.227−7013.
cisco Systems, Inc. 170 West Tasman Drive
San Jose, California 95134−1706
Cisco Internetwork Operating System Software IOS (tm) 1600 Software (C1600−SY−L),
Version 12.1(7), RELEASE SOFTWARE (fc1)
Copyright (c) 1986−2001 by cisco Systems, Inc.
Compiled Thu 22−Feb−01 12:56 by kellythw
Image text−base: 0x08041D10, data−base: 0x02005000
cisco 1603 (68360) processor (revision C) with 13824K/4608K bytes of memory.
Processor board ID 05317740, with hardware revision 00000000
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
1 Ethernet/IEEE 802.3 interface(s)
1 Serial(sync/async) network interface(s)
1 ISDN Basic Rate interface(s)
System/IO memory with parity disabled
2048K bytes of DRAM onboard 16384K bytes of DRAM on SIMM
System running from FLASH
7K bytes of non−volatile configuration memory.
12288K bytes of processor board PCMCIA flash (Read ONLY)
Building configuration...
[OK]}
Press RETURN to get started!
00:01:05: %SYS−5−CONFIG_I: Configured from memory by console
00:01:58: %SYS−5−RESTART: System restarted −−
Cisco Internetwork Operating System Software
IOS (tm) 1600 Software (C1600−SY−L), Version 12.1(7), RELEASE SOFTWARE (fc1)
Copyright (c) 1986−2001 by cisco Systems, Inc.
Compiled Thu 22−Feb−01 12:56 by kellythw
Router−1600
Packet Switching
The switching architecture of the Cisco 1600 Series Router is based on the shared memory architecture. The
Cisco 2500, 4x00 and AS5300 Series also use this switching architecture.
Cisco IOS software on shared memory routers uses the system buffers for all packet switching, not just
process switching. In addition to the standard public buffer pools, the Cisco IOS software also creates private
system buffer pools and special buffer structures for the interface controllers called RX rings and TX rings.
Private Buffer Pools
Private buffer pools are static and are allocated with a fixed number of buffers during initialization of the
Cisco IOS software. New buffers cannot be created on demand for these pools. If a buffer is needed and none
are available in the private pool, Cisco IOS software falls back to the public buffer pool for the size that
matches the interface's maximum transmission unit (MTU).
Receive Rings and Transmit Rings
Cisco 1600 Series Router Architecture