Cisco 2511 Terminal Server, only 5 VTY lines?
I recently picked up a Cisco 2511 router to use as a terminal server in my home lab. It has 16 async connections on it for console ports, however, I can only access 5 vty lines for remote access. I've seen some videos with people reverse telnetting to over a dozen devices. How do I get more vty lines on this thing?
Thanks
So what you really want is the TTY ports. You connect the ASYNC cables to the console ports on the devices you want to access.
http://www.cisco.com/en/US/tech/tk801/tk36/technologies_configuration_ex...
Here's a sample config of my setup. The idea is you telnet to an IP configured on the termserver (TSV) on the TTY port you want to access:
i.e.: telnet 10.1.1.1 2033
This port will connect to the console port router-ar4001-1
Additionally you can telnet from inside the TSV if you configure IP Host entries
i.e.: router-tsv01#connect router-ar4001-1
Sample Config (note from a 2610XM):
router-tsv01#sh run
Building configuration...
!
interface FastEthernet0/0 <- Interface on TSV
description router-tsv01
ip address 10.1.1.1 255.255.255.0 <- IP address for network connectivity
no ip redirects
no ip proxy-arp
no ip mroute-cache
speed 100
full-duplex
no keepalive
!
ip host router-ar4001-1 2033 10.1.1.1 <- IP host entries so you can telnet by hostname (2033 is the TTY port the Async cable is connected to)
ip host router-rtr006-1 2059 10.1.1.1
ip host router-rtr009-1 2057 10.1.1.1
ip host router-rtr015-2 2054 10.1.1.1
ip host router-rtr015-1 2053 10.1.1.1
ip host router-ar4002-2 2036 10.1.1.1
ip host router-ar4002-1 2035 10.1.1.1
ip host router-ar4003-1 2037 10.1.1.1
ip host router-ar4005-1 2041 10.1.1.1
ip host router-ar4004-1 2039 10.1.1.1
ip host router-ar4001-2 2034 10.1.1.1
ip host router-ar4003-2 2038 10.1.1.1
ip host router-ar4004-2 2040 10.1.1.1
ip host router-ar4005-2 2042 10.1.1.1
ip host router-rtr005-1 2051 10.1.1.1
ip host router-rtr005-2 2052 10.1.1.1
ip host router-rtr002-1 2055 10.1.1.1
ip host router-rtr002-2 2056 10.1.1.1
ip host router-rtr009-2 2058 10.1.1.1
ip host router-rtr006-2 2060 10.1.1.1
line 33 56 <- allow telnet on device to ASYNC ports
exec-timeout 0 0
no exec
transport preferred telnet
transport input telnet
transport output telnet
line 57 60
exec-timeout 0 0
no exec
transport preferred telnet
transport input telnet
transport output telnet
speed 115200
line 61 64
exec-timeout 0 0
no exec
transport preferred telnet
transport input telnet
transport output telnet
router-tsv01#sh hosts <- Will show all the configured IP host entries
Default domain is
Name/address lookup uses domain service
Name servers are 4.2.2.2, 8.8.8.8
Codes: UN - unknown, EX - expired, OK - OK, ?? - revalidate
temp - temporary, perm - permanent
NA - Not Applicable None - Not defined
Host Port Flags Age Type Address(es)
router-rtr01 2033 (perm, OK) ** IP 10.1.1.1
router-rtr006-1 2059 (perm, OK) ** IP 10.1.1.1
router-rtr009-1 2057 (perm, OK) ** IP 10.1.1.1
router-rtr015-2 2054 (perm, OK) ** IP 10.1.1.1
router-rtr015-1 2053 (perm, OK) ** IP 10.1.1.1
router-ar4002-2 2036 (perm, OK) ** IP 10.1.1.1
router-ar4002-1 2035 (perm, OK) ** IP 10.1.1.1
router-ar4003-1 2037 (perm, OK) ** IP 10.1.1.1
router-ar4005-1 2041 (perm, OK) ** IP 10.1.1.1
router-ar4004-1 2039 (perm, OK) ** IP 10.1.1.1
router-ar4001-2 2034 (perm, OK) ** IP 10.1.1.1
router-ar4003-2 2038 (perm, OK) ** IP 10.1.1.1
router-ar4004-2 2040 (perm, OK) ** IP 10.1.1.1
router-ar4005-2 2042 (perm, OK) ** IP 10.1.1.1
router-rtr005-1 2051 (perm, OK) ** IP 10.1.1.1
router-rtr005-2 2052 (perm, OK) ** IP 10.1.1.1
router-rtr002-1 2055 (perm, OK) ** IP 10.1.1.1
router-rtr002-2 2056 (perm, OK) ** IP 10.1.1.1
router-rtr009-2 2058 (perm, OK) ** IP 10.1.1.1
router-rtr006-2 2060 (perm, OK) ** IP 10.1.1.1
router-tsv01#sh line <- will show all line TTY and VTY ports on the device
Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
0 CTY - - - - - 0 0 0/0 -
33 TTY 9600/9600 - - - - - 7 3 0/0 -
34 TTY 9600/9600 - - - - - 2 39 0/0 -
35 TTY 9600/9600 - - - - - 1 0 0/0 -
36 TTY 9600/9600 - - - - - 0 39 0/0 -
37 TTY 9600/9600 - - - - - 1 0 0/0 -
38 TTY 9600/9600 - - - - - 0 36 0/0 -
39 TTY 9600/9600 - - - - - 1 0 0/0 -
40 TTY 9600/9600 - - - - - 0 36 0/0 -
41 TTY 9600/9600 - - - - - 0 34 0/0 -
42 TTY 9600/9600 - - - - - 0 37 0/0 -
43 TTY 9600/9600 - - - - - 0 0 0/0 -
44 TTY 9600/9600 - - - - - 0 0 0/0 -
45 TTY 9600/9600 - - - - - 0 0 0/0 -
46 TTY 9600/9600 - - - - - 0 0 0/0 -
47 TTY 9600/9600 - - - - - 0 0 0/0 -
48 TTY 9600/9600 - - - - - 0 0 0/0 -
49 TTY 9600/9600 - - - - - 0 1 0/0 -
50 TTY 9600/9600 - - - - - 0 0 0/0 -
51 TTY 9600/9600 - - - - - 0 963 0/0 -
52 TTY 9600/9600 - - - - - 0 5 0/0 -
53 TTY 9600/9600 - - - - - 0 4 0/0 -
54 TTY 9600/9600 - - - - - 0 68 0/0 -
55 TTY 9600/9600 - - - - - 0 719315 0/0 -
56 TTY 9600/9600 - - - - - 0 0 0/0 -
57 TTY 115200/115200- - - - - 1 0 0/0 -
58 TTY 115200/115200- - - - - 0 0 0/0 -
59 TTY 115200/115200- - - - - 3 0 0/0 -
60 TTY 115200/115200- - - - - 0 0 0/0 -
61 TTY 9600/9600 - - - - - 0 0 0/0 -
62 TTY 9600/9600 - - - - - 0 0 0/0 -
63 TTY 9600/9600 - - - - - 0 0 0/0 -
64 TTY 9600/9600 - - - - - 0 0 0/0 -
65 AUX 9600/9600 - - - - - 1 0 0/0 -
* 66 VTY - - - - 5 557 0 0/0 -
67 VTY - - - - 5 5 0 0/0 -
68 VTY - - - - 5 0 0 0/0 -
69 VTY - - - - 5 0 0 0/0 -
70 VTY - - - - 5 0 0 0/0 -
Might be the version of code you are running. Some versions of IOS support only 0-4 VTY, some support a lot more. Post a show version and we can take a look at feature list.
Here you go, version 12.3
#show ver
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by cisco Systems, Inc.
Compiled Mon 17-Mar-08 14:39 by dchih
ROM: System Bootstrap, Version 11.0(10c)XB2, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
BOOTLDR: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c)XB2, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
Term uptime is 10 minutes
System returned to ROM by reload
System image file is "flash:/c2500-is-l.123-26.bin"
cisco 2511 (68030) processor (revision L) with 14336K/2048K bytes of memory.
Processor board ID 01212, with hardware revision 00000000
Bridging software.
X.25 software, Version 3.0.0.
1 Ethernet/IEEE 802.3 interface(s)
2 Serial network interface(s)
16 terminal line(s)
32K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read ONLY)
Configuration register is 0x2102
I think you need either Enterprise Plus (most recent c2500-js-l.122-29b.bin) or the Remote Access Server (most recent c2500-c-l.123-26.bin) feature set to access more than 5 VTY lines. I believe the image you have (IP Plus) is limited to 5 VTY ports on the 2500 platform. If you have a CCO account you may be able to download them direct from Cisco.com.
I have 16 TTY ports, of which 12 are plugged into equipment. The problem I'm having is I'm trying to telnet to the terminal server from my desktop, however I can only open 5 telnet sessions at a time. Subsequent attempts are refused and I get a "Broken Pipe" error in Secure CRT.
Your sample script shows VTY 69, 70, etc... Here's what I get when I try to configure VTY's:
Term(config)#line vty ?
<0-4> First Line number
What I would like to do is reverse telnet to all 12 devices, so they each have their own tab. How do you get so many VTYs? Is there a command to enable more?
To err is human...