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It provides console level access to multiple Cisco devices for remote configuration and management.
The Cisco C1100TG-A-48 or C1100TG-A-32 modules are used to provide out of band connectivity to the console ports of other
devices. On the Cisco C1100TG-A-48 or C1100TG-A-32 async modules, the interfaces are addressed as interface async <slot/subslot/port>.
You must have privileged EXEC access to the router's command line interface (CLI). For more information on using the command line and for understanding command modes, see Using Cisco IOS Software.
For instructions on connecting a console to your router, refer to the documentation that accompanied your router, or refer to the online documentation for your equipment.
Perform the following steps to configure. In the below mentioned configuration steps a basic terminal server function is configured using default parameters.
From privileged EXEC mode, enter the configure command.
router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
router(config)#ip vrf Mgmt-intf
!--- If not done already, create management vrf globally (in this example vrf Mgmt-intf )
router(config-vrf)#interface GigabitEthernet0
router(config-if)#vrf forwarding Mgmt-intf
!--- Assign interface GigabitEthernet0 to vrf Mgmt-intf
router(config-if)#ip address 10.75.163.95 255.255.255.0
!--- Use a public IP address to ensure connectivity
router(config-if)#ip route vrf Mgmt-intf 0.0.0.0 0.0.0.0 10.75.163.1
!--- configure correct route to gateway in vrf Mgmt-intf
router(config)#line 0/1/0
!--- switch to Line configuration mode for asynchronous port configuration
router(config-line)#transport input all
!--- Defines the protocols to use when connecting to a specific line of the device. In this case all protocols (default)
router(config-line)#no exec
!--- Allow an outgoing connection only
transport input all [databits] [parity] [speed]
|
[databits] |
Sets the number of data bits per character that are interpreted and generated by the router hardware. |
|
[parity] |
Sets terminal parity. Need to sync with device console. |
|
[speed] |
Sets the transmit and receive speeds. Need to sync with device console. |
Use the following show commands for the verification:
router#show running-config
Building configuration...
...
!--- Lines omitted for brevity
ip vrf Mgmt-intf
!
!
interface GigabitEthernet0
ip vrf forwarding Mgmt-intf
ip address 10.75.163.95 255.255.255.0
!
ip route vrf Mgmt-intf 0.0.0.0 0.0.0.0 10.75.163.1
!
line 0/1/0
transport input all
no exec
!
end
The following commands are explained:
transport input
databits
parity
speed
Defines the protocols that needs to be used when connecting to the terminal server.
transport input {all | lat | mop | nasi | none | pad | rlogin | ssh | telnet | udptn}
|
all |
All protocols |
|
lat |
DEC LAT protocol |
|
mop |
DEC MOP Remote Console Protocol |
|
nasi |
NASI protocol |
|
none |
No protocols |
|
pad |
X.3 PAD |
|
rlogin |
Unix rlogin protocol |
|
ssh |
TCP/IP SSH protocol |
|
telnet |
TCP/IP Telnet protocol |
|
udptn |
UDPTN async via UDP protocol |
Sets the number of data bits per character that are interpreted and generated by the router hardware. To restore the default value, use the no form of the command.
databits {5 | 6 | 7 | 8}
no databits
|
5 |
Five data bits per character. |
|
6 |
Six data bits per character. |
|
7 |
Seven data bits per character. |
|
8 |
Eight data bits per character (default). |
 Note |
Only 7 and 8 data bits work. |
Defines generation of a parity bit. To specify no parity, use the no form of this command.
parity {none | even | odd | space | mark}
no parity
|
none |
No parity (Default) |
|
even |
Even parity |
|
odd |
Odd parity |
|
space |
Space parity |
|
mark |
Mark parity |
Usage Guideline: Need to sync between Device Console line and Terminal Server TTY line.
Sets the transmit and receive speed.
|
<0-4294967295> |
Baud rate in bits per second (bps). |
Default speed is 9600.
Usage Guideline: Need to sync between Device Console line and Terminal Server TTY line.
Use show line command to check all the TTY line summary information. The output contains information about mapping between async interface and line number, the line speed, uses, noise and so on. The line that begins with the asterisk "*" indicates that the line is in use.
Router#show line
Tty Line Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
* 0 0 CTY - - - - - 0 0 0/0 -
1 1 AUX 9600/9600 - - - - - 0 0 0/0 -
* 0/1/0 2 TTY 9600/9600 - - - - - 1 7 0/0 -
0/1/1 3 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/2 4 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/3 5 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/4 6 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/5 7 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/6 8 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/7 9 TTY 9600/9600 - - - - - 0 6 0/0 -
0/1/8 10 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/9 11 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/10 12 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/11 13 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/12 14 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/13 15 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/14 16 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/15 17 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/16 18 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/17 19 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/18 20 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/19 21 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/20 22 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/21 23 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/22 24 TTY 9600/9600 - - - - - 0 7 0/0 -
0/1/23 25 TTY 9600/9600 - - - - - 0 7 0/0 -
* 866 866 VTY - - - - - 19 0 0/0 -
* 867 867 VTY - - - - - 32 0 0/0 -
868 868 VTY - - - - - 13 0 0/0 -
869 869 VTY - - - - - 0 0 0/0 -
870 870 VTY - - - - - 0 0 0/0 -
Line(s) not in async mode -or- with no hardware support:
26-865
You can also use show line <line number> command to get the TTY line detail information. It gives you the information about the configured or by default parameters on that TTY line.
Router#show line 2
Tty Line Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
* 0/1/0 2 TTY 9600/9600 - - - - - 1 7 0/0 -
Line 0/1/0, Location: "", Type: "XTERM"
Length: 24 lines, Width: 117 columns
Baud rate (TX/RX) is 9600/9600, no parity, 2 stopbits, 8 databits
Status: Ready, Connected, Active
Capabilities: EXEC Suppressed
Modem state: Ready
Group codes: 0
Special Chars: Escape Hold Stop Start Disconnect Activation
^^x none - - none
Timeouts: Idle EXEC Idle Session Modem Answer Session Dispatch
never never none not set
Idle Session Disconnect Warning
never
Login-sequence User Response
00:00:30
Autoselect Initial Wait
not set
Modem type is unknown.
Session limit is not set.
Time since activation: 00:24:46
Editing is enabled.
History is enabled, history size is 10.
DNS resolution in show commands is enabled
Full user help is disabled
Allowed input transports are lat pad telnet rlogin mop udptn nasi ssh acercon.
Allowed output transports are lat pad telnet rlogin mop nasi ssh.
Preferred transport is lat.
Shell: enabled
Shell trace: off
No output characters are padded
No special data dispatching characters
Use show interface async <slot/subslot/interface> command to get the async interface details including counters of input/output queue, rate, packets, bytes, and so on.
Router#show interfaces async 0/1/0
Async0/1/0 is up, line protocol is down
Hardware is NIM-24A
MTU 1500 bytes, BW 17 Kbit/sec, DLY 0 usec,
reliability 25/255, txload 1/255, rxload 1/255
Encapsulation ASYNC, loopback not set
Keepalive not set
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/0 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
114 packets input, 12608 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
17 packets output, 17 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
Use show tcp <line number> command to get the tcp session detailed information including foreign host, connection state, Event Timers, datagrams counters, and so on.
Router#show tcp 2
tty0/1/0, virtual tty from host 10.75.157.51
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 255
Local host: 10.75.163.116, Local port: 2002
Foreign host: 10.75.157.51, Foreign port: 17719
Connection tableid (VRF): 1
Maximum output segment queue size: 20
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0x11F2BAC0):
Timer Starts Wakeups Next
Retrans 112 0 0x0
TimeWait 0 0 0x0
AckHold 15 2 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 0 0 0x0
DeadWait 0 0 0x0
Linger 0 0 0x0
ProcessQ 0 0 0x0
iss: 2183166457 snduna: 2183179079 sndnxt: 2183179079
irs: 334962581 rcvnxt: 334962632
sndwnd: 24656 scale: 0 maxrcvwnd: 4128
rcvwnd: 4078 scale: 0 delrcvwnd: 50
SRTT: 1000 ms, RTTO: 1003 ms, RTV: 3 ms, KRTT: 0 ms
minRTT: 1 ms, maxRTT: 1000 ms, ACK hold: 200 ms
uptime: 1919014 ms, Sent idletime: 1811238 ms, Receive idletime: 1811237 ms
Status Flags: passive open, active open
Option Flags: Retrans timeout
IP Precedence value : 0
Datagrams (max data segment is 536 bytes):
Rcvd: 125 (out of order: 0), with data: 14, total data bytes: 50
Sent: 114 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 111, total data bytes: 12621
Packets received in fast path: 0, fast processed: 0, slow path: 0
fast lock acquisition failures: 0, slow path: 0
TCP Semaphore 0x7FC594004670 FREE
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