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MAN page from RedHat EL 8 dynamips-0.2.21-1.el8.x86_64.rpm

DYNAMIPS

Section: User Commands (1)
Updated: Sep 28, 2013
Index 

NAME

dynamips - Cisco router simulator 

SYNOPSIS

dynamips[options]ios_image
 

DESCRIPTION

Emulates Cisco routers on a traditional PC. You can use dynamips to create labs. It uses real Cisco IOS Images, which are not included in this package. Of course, this emulator cannot replace a real router.It is simply a complementary tool to real labs for administrators of Cisconetworks or people wanting to pass their CCNA/CCNP/CCIE exams.
The emulator currently supports Cisco 7200, Cisco 3745, Cisco 3725, Cisco 3600, Cisco 2691, Cisco 2600, and Cisco 1700 series.
By default, a Cisco 7206VXR with NPE-200 (256 Mb of DRAM) is emulated.
To emulate another platform, like the Cisco 3600 series, use the "-P" command line option.You can change the chassis type with "-t". Don't forget to set it depending on your IOS image, a c3660 image will not run onc3640 hardware and vice-versa.

 

OPTIONS

A summary of options is included below.
-H <tcp_port>
Enable hypervisor mode.
The hypervisor mode of dynamips allows you to run simultaneouslymany virtual router instances, and to simulate ATM, Ethernetor Frame-Relay networks.
You can connect directly to the TCP control port with telnet, or usedynagen(1), dynagui(1) that will pass commands transparently. The second method is highly recommended.
-l <log_file>
Set logging file (default is dynamips_log.txt)
-j
Disable the JIT compiler, very slow
--exec-area <size>
Set the exec area size (default: 64 Mb)
The exec area is a pool of host memory used to store pages translated bythe JIT (they contain the native code corresponding to MIPS code pages).

--idle-pc <pc>
Set the idle PC (default: disabled)
The "idle PC" feature allows you to run a router instance without havinga 100% CPU load. This implies that you can run a larger number of instancesper real machine.
To determine the "idle PC", start normally the emulator with your Cisco IOSimage, and a totally IOS empty configuration (although not mandatory, thiswill give better results). When the image is fully booted, wait for the"Press RETURN to get started!" message prompt, but do not press Enter key.Wait about 5 seconds, then press "Ctrl-] + i". Some statistics will begathered during 10 seconds. At the end, the emulator will display a list ofpossible values to pass to the "--idle-pc" option. You may have to try somevalues before finding the good one. To check if the idle PC value is good,just boot the Cisco IOS image, and check your CPU load when the consoleprompt is available. If it is low, you have found a good value, keep itpreciously.
Important remarks:
* An "idle PC" value is *specific* to a Cisco IOS image. You cannotboot a different IOS image without proceeding as described above.
* Do not run the process while having the "autoconfiguration" prompt.

--timer-itv <val>
Timer IRQ interval check (default: 1000)
-i <instance>
Set instance ID
-r <ram_size>
Set the virtual RAM size (default: 256 Mb)
-o <rom_size>
Set the virtual ROM size (default: 4 Mb)
-n <nvram_size>
Set the NVRAM size (default: 128 Kb)
-c <conf_reg>
Set the configuration register (default: 0x2102)
-m <mac_addr>
Set the MAC address of the chassis (default: automatically generated)
-C, --startup-config <file>
Import IOS configuration file into NVRAM
--private-config <file>
Import IOS configuration file into NVRAM
-X
Do not use a file to simulate RAM (faster)
-R <rom_file>
Load an alternate ROM (default: embedded)
-k <clock_div>
Set the clock divisor (default: 4)
Specify the clock divider (integer) based on the host clock.Alter the value to match the CISCO clock with the real time.The command "show clock" at the IOS' CLI will help you set this value.

-T <port>
Console is on TCP <port>
-U <si_desc>
Console in on serial interface <si_desc> (default is on the terminal)
-A <port>
AUX is on TCP <port>
-B <si_desc>
AUX is on serial interface <si_desc> (default is no AUX port)
--disk0 <size>
Set PCMCIA ATA disk0: size (default: 64 Mb)
--disk1 <size>
Set PCMCIA ATA disk1: size (default: 0 Mb)
-a <cfg_file>
Virtual ATM switch configuration file.
-f <cfg_file>
Virtual Frame-Relay switch configuration file.
-E <cfg_file>
Virtual Ethernet switch configuration file.
-e
Show network device list of the host machine.

 

OPTIONS specific to the Cisco 7200 series

-t <npe_type>
Select NPE type (default: "npe-200")
-M <midplane>
Select Midplane ("std" or "vxr")
-p <pa_desc>
Define a Port Adapter
-s <pa_nio>
Bind a Network IO interface to a Port Adapter

 

OPTIONS specific to the Cisco 3600 series

-t <chassis_type>
Select Chassis type (default: "3640")
-p <nm_desc>
Define a Network Module
-s <nm_nio>
Bind a Network IO interface to a Network Module

 

Cisco 7200 Port Adapter Description <pa_desc>

Format
slot:pa_driver
slot
the number of the physical slot (starts from 0)
pa_driver
the name of a Port Adapter driver in:
C7200-IO-FE
(FastEthernet, slot 0 only)
PA-FE-TX
(FastEthernet, slots 1 to 6)
PA-4E
(Ethernet, 4 ports)
PA-8E
(Ethernet, 8 ports)
PA-4T+
(Serial, 4 ports)
PA-8T
(Serial, 8 ports)
PA-A1
(ATM)
 

Cisco 3600 Network Module Description <nm_desc>

Format
slot:nm_driver
slot
the number of the physical slot (starts from 0)
nm_driver
the name of a Network Module driver in:
NM-1E
(Ethernet, 1 port)
NM-4E
(Ethernet, 4 ports)
NM-1FE-TX
(FastEthernet, 1 port)
NM-4T
(Serial, 4 ports)
Leopard-2FE
(Cisco 3660 FastEthernet in slot 0, automatically used)
 

NIO binding to Port Adapter <pa_nio> and Network Modules <nm_nio>:

Format
slot:port:netio_type[:netio_parameters]
slot
the number of the physical slot (starts from 0)
port
the port in the specified slot (starts from 0)
netio_type
host interface for communication
unix:<local_sock>:<remote_sock>
Use unix sockets for local communication.<local_sock> is created and represents the local NIC.<remote_sock> is the file used by the other interface.(ex. "/tmp/local:/tmp/remote")
vde:<control_sock>:<local_sock>
For use with UML (User-Mode-Linux) or VDE switches.VDE stands for "Virtual Distributed Ethernet".Please refer to : http://sourceforge.net/projects/vde/
tap:<tap_name>
Use a virtual ethernet device for communication.<tap_name> is the name of the tap device (ex. "tap0")
gen_eth:<dev_name>
Use a real ethernet device for communication, using libpcap 0.9 or WinPcap. Works on Windows and Unix systems.
<dev_name> is the name of the Ethernet device (ex. "eth0")
The device list can be found using the "-e" option.
linux_eth:<dev_name>
Use a real ethernet device for communication (Linux specific).<dev_name> is the name of the Ethernet device (ex. "eth0")
udp:<local_port>:<remote_host>:<remote_port>
Use an UDP socket for connection between remote instances. <local_port> is the port we listen to.<remote_host> is the host listening the port you want to connect to.<remote_port> is the port you want to connect to. (ex. "1000:somehost:2000" and "2000:otherhost:1000" on the other side)
tcp_cli:<host>:<port>
Client side of a tcp connection.<host> is the ip address of the server.<port> is the port to connect to.
tcp_ser:<port>
Server side of a tcp connection.<port> is the port to listen to.
null
Dummy netio (used for testing/debugging), no parameters needed.
 

VTTY binding to real serial port device <si_desc>

Format
<device>{:baudrate{:databits{:parity{:stopbits{:hwflow}}}}}}
device
character device name, e.g. /dev/ttyS0
baudrate
baudrate
databits
number of databits
parity
data parity: N=none, O=odd, E=even
stopbits
number of stop bits
hwflow
hardware flow control (0=disable, 1=enable)
Note that the device field is mandatory, however other fields are optional.(dynamips will default to 9600, 8, N, 1, no hardware flow control)
Note that access to the escape commands (described below) through a serialport are deliberately prevented, as the escape commands interfere withserial encapsulation protocols.

 

Escape commands

You can press ^] (Ctrl + ]) at any time, followed by one of these characters:
o
Show the VM object list
d
Show the device list
r
Dump MIPS CPU registers
t
Dump MIPS TLB entries
m
Dump the latest memory accesses
s
Suspend CPU emulation
u
Resume CPU emulation
q
Quit the emulator
b
Dump the instruction block tree
h
JIT hash table statistics
l
MTS64 cache statistics
c
Write IOS configuration to disk (ios_cfg.txt)
j
Non-JIT mode statistics
x
Experimentations (can crash the box!)
^]
Send ^]
If you press an unrecognized key, help will be shown. Note: on Windows, it may be the "Ctrl + $" sequence.
 

Virtual Bridge

The virtual bridge is used to emulate a shared network between emulatorinstances.Any emulator instance can act as a virtual bridge.
The configuration file (specified by the "-b" option) contains a list ofNetIO descriptors, with the following syntax:
interface_name:netio_type[:netio_parameters]
Example:
# Connection to instance "I0"I0:udp:10000:127.0.0.1:10001# Connection to instance "I1"I1:udp:10002:127.0.0.1:10003# Connection to instance "I2"I2:udp:10004:127.0.0.1:10005

The "I0" instance would be launched with the following parameters:

dynamips ios.bin -p 1:PA-FE-TX -s 1:0:udp:10001:127.0.0.1:10000

 

Virtual Ethernet switch

The virtual ethernet switch is used to emulate an Ethernet network betweenemulator instances. This switch supports access and trunk ports (802.1Q).ISL will be available in a future release.
Any emulator instance can act as a virtual ethernet switch.
The configuration file (specified by the "-E" option) contains a list ofNetIO descriptors (representing interfaces) and a list of interface properties(access/trunk port, VLAN info...)
The interface definition is similar to Port Adapters:
IF:interface_name:netio_type[:netio_parameters]
Access Port
ACCESS:interface_name:vlan_id
802.1Q Trunk Port
DOT1Q:interface_name:native_vlan

The native VLAN is not tagged. On Cisco devices, by default the native VLANis VLAN 1.

Example of configuration file:
IF:E0:udp:10000:127.0.0.1:10001IF:E1:udp:10002:127.0.0.1:10003IF:E2:gen_eth:eth0DOT1Q:E0:1ACCESS:E1:4DOT1Q:E2:1

 

Virtual ATM switch

The virtual ATM switch fabric is used to emulate an ATM backbone betweenemulator instances. The use of this virtual switch is not mandatory, youcan directly connect emulator instances for point-to-point ATM connections.Please note that only basic VP/VC switching is supported, there is nosupport for ILMI/QSAAL/... or other specific ATM protocols.
Any emulator instance can act as a virtual ATM switch.
Example of configuration file (specified by the "-a" option):
# Virtual Interface ListIF:A0:udp:10001:127.0.0.1:10000IF:A1:udp:10002:127.0.0.1:10003IF:A2:udp:10004:127.0.0.1:10005# VP connection between I0 and I1VP:A0:10:A1:20VP:A1:20:A0:10# VP connection between I0 and I2VP:A0:11:A2:30VP:A2:30:A0:11# VC connection between I1 and I2VC:A1:5:2:A2:7:3VC:A2:7:3:A1:5:2

In this example, we have 3 virtual interfaces, A0, A1 and A2. The syntaxfor interface definition is similar to Port Adapters:

IF:interface_name:netio_type[:netio_parameters]
You can do VP switching or VC switching:
VP switching
VP:input_if:input_vpi:output_if:output_vpi
VC switching
VC:input_if:input_vpi:input_vci:output_if:output_vpi:output_vci

 

Testing the Virtual ATM switch with one dynamips instance

Virtual ATM switch configuration file ("atm.cfg"):
IF:A0:udp:10003:127.0.0.1:10001IF:A1:udp:10004:127.0.0.1:10002# a0/vpi=1/vci=100 connects to a1/vpi=2/vci=200VC:A0:1:100:A1:2:200VC:A1:2:200:A0:1:100
Invoking dynamips:
./dynamips -p 1:PA-A1 -s 1:0:udp:10001:127.0.0.1:10003 -p 2:PA-A1 -s 2:0:udp:10002:127.0.0.1:10004 -a atm.cfg IOS.BIN
(note input ports of IOS interfaces are output ports of ATM switchinterfaces, and vice versa).
IOS Configuration:
ip cefip vrf test rd 1:1 route-target both 1:1int a1/0 no shutint a1/0.2 p ip addr 1.1.1.1 255.255.255.0 pvc 1/100interface a2/0 no shutinterface a2/0.2 p ip vrf forwarding test ip addr 1.1.1.2 255.255.255.0 pvc 2/200!

 

Virtual Frame-Relay switch

The virtual Frame-Relay switch fabric is used to emulate a Frame-Relaybackbone between emulator instances. The use of this virtual switch is notmandatory, you can directly connect emulator instances with appropriate IOSconfiguration.
Any emulator instance can act as a virtual Frame-Relay switch.There is only a basic implementation of the LMI protocol (ANSI Annex D), whichis probably not conforming but works with Cisco IOS. Fortunately, Cisco IOSis able to detect automatically the LMI protocol.
Example of configuration file (specified by the "-f" option):
# Virtual Interface ListIF:S0:udp:10001:127.0.0.1:10000IF:S1:udp:10002:127.0.0.1:10003# DLCI switching between S0 and S1VC:S0:200:S1:100VC:S1:100:S0:200

In this example, we have 2 virtual interfaces, S0 and S1. The syntaxfor interface definition is similar to Port Adapters:

IF:interface_name:netio_type[:netio_parameters]
DLCI switching syntax:
VC:input_if:input_dlci:output_if:output_dlci

In the example above, the switch is configured to switch packetsreceived on interface S0 with DLCI 200 to interface S1 with DLCI 100,and vice-versa.

 

BUGS

See RELEASE-NOTES.
 

REPORTING BUGS


Please send bug reports to  

SEE ALSO


nvram_export(1), hypervisor_mode(7), dynagen(1), dynagui(1)



 

OLD WEBSITES



 

AUTHOR

dynamips is being maintained by Flávio J. Saraiva <flaviojs2005AATTgmail.com>. This manual page was initially written by Erik Wenzel <erikAATTdebian.org> for the Debian GNU/Linux system.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
OPTIONS specific to the Cisco 7200 series
OPTIONS specific to the Cisco 3600 series
Cisco 7200 Port Adapter Description <pa_desc>
Cisco 3600 Network Module Description <nm_desc>
NIO binding to Port Adapter <pa_nio> and Network Modules <nm_nio>:
VTTY binding to real serial port device <si_desc>
Escape commands
Virtual Bridge
Virtual Ethernet switch
Virtual ATM switch
Testing the Virtual ATM switch with one dynamips instance
Virtual Frame-Relay switch
BUGS
REPORTING BUGS
SEE ALSO
OLD WEBSITES
AUTHOR

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