Lifecycle
Introduced: 1990
End-of-Sale Date: 1993-01-01
End-of-Support Date: 1998-01-02
Hardware Versions
Available in 3 versions. All versions include one DB-25(F) console connector and one DB-25(M) auxiliary connector.
IGS/R- One Ethernet AUI, One DD-50 high-speed serialIGS/L- Two Ethernet AUI, no high-speed serialIGS/TR- One DE-9 Token Ring, One DD-50 high-speed serial
Operating System Versions
IOS 8.x
IOS 8.2
IOS 8.2 is mentioned in “Router Products Release Notes for Software Release 8.3” document, so probably supported:
8.3(6) Caveats/8.3(7) Modifications • System images from the 8.3, 9.0, 9.1, and 9.14 releases could not be successfully netbooted on IGS boxes with 8.2 EPROMs. The ROM monitor in the 8.2 EPROMs did not support some functions that the newer releases uses. The system image should protect itself by error checking the return code from all ROM monitor calls. [CSCdi08521]
IOS 8.3
Supported by 8.3(1) through 8.3(9): (Router Products Release Note for Software Release 8.3: bitsavers)
IGS/TR requires at least 8.3(5) to enable Token Ring support.
IOS 9.x
IOS 9.21(5)
Supported by 9.21(5) (Router Products Release Notes for Software Release 9.21: wayback source)
PPP Note: PPP was not included in 9.1/9.14, but was included in 9.21.
IOS 10.x
IOS 10.0(5)
Supported by 10.0(5), 4MB RAM required, runs from ROM (Router Products Release Notes for Cisco IOS Release 10.0)
IOS ≥10.1
“With IOS Release 10.1, the Cisco software image size has exceeded 4 megabytes (MB) and when compressed exceeds 2 MB.”
10.1 may be able to run on the IGS when booted with TFTP, but cannot be booted from ROM.
IOS 11 requires 16MB of RAM for the AGS/MGS/CGS, so safe to assume the IGS can’t run it.
EEPROM Support
IGS/TR model does support support Flash EPROMs (EEPROM), but IGS/R and IGS/L models probably will not. (Router Products Release Notes for Software Release 9.21, Features Supported by Router Platforms)
Accessories
Rack-mount kit: COM-RKI=
Cables
Transition Cables
Only the IGS/R and IGS/TR require these cables.
- EIA/TIA-449 DTE interface, 3 meters:
CAB-IF= - EIAI/TIA-232 DTE interface, 3 meters:
CAB-IR= - V.35 DTE interface, 3 meters:
CAB-IV= - X.21 DTE interface, 3 meters:
CAB-IX=
Misc
Práctica 1 – Dispositivos de Interconexión de Redes | Taller de Redes Avanzadas (wordpress.com)
https://eoinpk.blogspot.com/2021/08/cisco-igs-r-from-1993-pings-google-for.html
Cisco (Logical Solutions, Lantronix) Console Connection Guide (conserver.com)
Generic HDLC layer — The Linux Kernel documentation
Cisco’s first router: Revisiting the venerable AGS+ in 2021 – DR-Blog (designated-router.com)