http://www.cisco.com/univercd/cc/td/doc/product/software/ios112/112cg_cr/3rb
ook/3rterms.htm
rotary
To define a group of lines consisting of one of more lines, use the rotary
line configuration command. Use the no form of this command to remove a line
or group of lines from a rotary group.
rotary group
no rotary
Syntax Description
group
Integer between 1 and 100 that you choose to identify the rotary group.
Default
None
Command Mode
Line configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 10.0.
Typically, rotary groups are used on devices with multiple modem connections
to allow connections to the next free line in a hunt group.
Connections to a rotary group can take advantage of the following features:
a.. Clear To Send (CTS)-If a line in a rotary group is configured to
require CTS, the Cisco IOS software skips that line if CTS from the attached
device is low. This feature enables the software to avoid inactive host
ports automatically. To enable this feature, use the modem bad line
configuration command.
b.. RS-232 handshaking-Rotary groups are often associated with large
terminal switches that require an RS-232 handshake before forming a
connection. In this case, use the modem callout line configuration command
to configure the lines in the group. If the RS-232 handshake fails on a
line, the Cisco IOS software steps to the next free line in the rotary group
and restarts the negotiation.
c.. Access control-You can use access lists for groups of virtual terminal
lines.
d.. Session timeout-Use the session-timeout line configuration command to
set an interval for a line so that if no activity occurs on a remotely
initiated connection for that interval the Cisco IOS software closes the
connection. The software assumes that the host has crashed or is otherwise
inaccessible.
The remote host must specify a particular TCP port on the router to connect
to a rotary group with connections to an individual line. The available
services are the same, but the TCP port numbers are different. Table 7 lists
the services and port numbers for both rotary groups and individual lines.
Table 7: Services and Port Numbers for Rotary Groups and Lines Services
Provided Base TCP Port for Rotaries Base TCP Port for
Individual Lines
Telnet protocol
3000
2000
Raw TCP protocol (no
Telnet protocol)
5000
4000
Telnet protocol, binary mode
7000
6000
XRemote protocol
10000
9000
For example, if Telnet protocols are required, the remote host connects to
the TCP port numbered 3000 (decimal) plus the rotary group number. If the
rotary group identifier is 13, the corresponding TCP port is 3013.
If a raw TCP stream is required, the port is 5000 (decimal) plus the rotary
group number. If rotary group 5 includes a raw TCP (printer) line, the user
connects to port 5005 and is connected to one of the raw printers in the
group.
If Telnet binary mode is required, the port is 7000 (decimal) plus the
rotary group number.
Example
The following example establishes a rotary group consisting of virtual
terminal lines 2 through 4 and defines a password on those lines. By using
Telnet to connect to TCP port 3001, the user gets the next free line in the
rotary group. The user does not have to remember the range of line numbers
associated with the password.
line vty 2 4
rotary 1
password letmein
login
<snip>
I just tried it for line vty 4 on my 1605R (specifying rotary 1) and I was
about to telnet to 3001.
Regarding ACL's on a CON port: You clearly can't filter incoming serial
connections, but you could apply an ACL outgoing (in other words, isolate
CON to that router only, or telnet to a single host, etc.)
-- Jason Roysdon, CCNA, MCSE, CNA, Network+, A+ List email:
[EMAIL PROTECTED] Homepage: http://jason.artoo.net/ Cisco resources:
http://r2cisco.artoo.net/
""ganapathi bhat"" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Hi,
>
> I have a question regarding VTY line and it's configuration...atleast in
> CISCO
>
> 1) One can have individual configuration for each vty line...suppose i
have
> configured 2 VTY lines to give telnet access..but with different
password...
>
> Now suppose, no one has opened a session with the configured router..if i
> try to telnet....by default it will go to VTY 1..suppose i know only VTY2
> password..then i can't telnet to that router...otherwise i have to open
one
> more telnet session so that i will land in VTY2
>
> My question is,is it possible to direct my telnet session to specific vty
> line..eg: telnet 1.1.1.1 VTY 2....so that i can give different passsword
to
> different line...
>
> ...................
> 2)access-class <acl name> in|out...what is the importance of this command
in
> line console 0 context...how one can filter based on ip address..for
console
> session...
>
> i tried many combination i did't get much..out of it..
> ..
> Can some one give me reference where i can go through for these topic....i
> tried cisco site...
>
>
> Could some one highlighht on this....
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