xCAT Cisco 2950 HOWTO

xCAT Cisco 2950 HOWTO

Overview

This document is to assist Field Technical Sales specialists in the configuration of the Cisco Catalyst 2950G-12 switch to be used in a Linux HPC environment. It is directly relevant to the configuration of the 2950 as an edge switch to a Force10 core switch.

All of the instructions below assume a connection with Hyperterminal and default values except change baud rate to 9600. Physical connection is with the blue serial cable provided by Cisco (CISCO 72-3383-01 REV A.0).

Helpful hints :

· Ctrl-P with redisplay what was just typed

· Interface supports Tab command completion

· "?" after any partial command will bring up help

Contents :

A Instructions to do initial configuration (Name/IP/Password)

B Instructions to make it connect to the Force 10 switch

C Instructions for setting up 2950 ports to “Cluster Friendly” values

D Instructions for setting up with a script through a tftp server

E Instructions to reset to Factory defaults (or, dohhh I want to start over !)

A. Instructions to do initial configuration (Name/IP/Password)

Press Enter and Cisco will prompt with :

% Please answer 'yes' or 'no'.

Would you like to enter the initial configuration dialog? [yes/no]:

Type “yes” and press Enter. Cisco will then prompt with :

At any point you may enter a question mark '?' for help.

Use ctrl-c to abort configuration dialog at any prompt.

Default settings are in square brackets '[]'.

Basic management setup configures only enough connectivity

for management of the system, extended setup will ask you

to configure each interface on the system

Would you like to enter basic management setup? [yes/no]:

Type “yes” and press Enter. Cisco will then prompt with :

Configuring global parameters:

Enter host name [Switch]:

Type the hostname of the switch here, for example “cisco01”, and press Enter, Cisco will then prompt with :

The enable secret is a password used to protect access to

privileged EXEC and configuration modes. This password, after

entered, becomes encrypted in the configuration.

Enter enable secret:

Type the password here, then press Enter. Our password is “cisco”. Cisco will then prompt with :

The enable password is used when you do not specify an

enable secret password, with some older software versions, and

some boot images.

Enter enable password:

This password must be different than the “secret” password. Type “cisco1” and press Enter. Cisco will then prompt with :

The virtual terminal password is used to protect

access to the router over a network interface.

Enter virtual terminal password:

Type a password of “cisco” and press Enter. Cisco will then prompt with :

Configure SNMP Network Management? [no]:

Press Enter to take the default answer of “no”. Cisco will then display the “Current interface summary”, as shown below :

Current interface summary

Any interface listed with OK? value "NO" does not have a valid configuration

Interface IP-Address OK? Method Status Protocol

Vlan1 unassigned NO unset up up

FastEthernet0/1 unassigned YES unset up down

FastEthernet0/2 unassigned YES unset down down

FastEthernet0/3 unassigned YES unset down down

FastEthernet0/4 unassigned YES unset down down

FastEthernet0/5 unassigned YES unset down down

FastEthernet0/6 unassigned YES unset up up

FastEthernet0/7 unassigned YES unset down down

FastEthernet0/8 unassigned YES unset up up

FastEthernet0/9 unassigned YES unset up up

FastEthernet0/10 unassigned YES unset down down

FastEthernet0/11 unassigned YES unset down down

FastEthernet0/12 unassigned YES unset down down

GigabitEthernet0/1 unassigned YES unset down down

GigabitEthernet0/2 unassigned YES unset down down

Enter interface name used to connect to the

management network from the above interface summary:

Type “vlan1” and press Enter. Cisco will then prompt with :

Configuring interface Vlan1:

Configure IP on this interface? [yes]:

Press Enter to take default “yes” answer. Cisco will then prompt with :

IP address for this interface:

Type the IP address for this Cisco switch. In our example it will be “172.20.101.1”, then press Enter. Cisco will prompt with :

Subnet mask for this interface [255.255.0.0] :

Type the subnet mask for the interface. In our example it will be “255.255.0.0”, press Enter. Cisco will prompt with :

Class B network is 172.20.0.0, 16 subnet bits; mask is /16

Would you like to enable as a cluster command switch? [yes/no]:

Type “no” and press Enter. Cisco will then display the “Configuration command script that was created” and give you the option to exit without saving or save to NVRAM and exit, as shown below :

The following configuration command script was created:

hostname cisco1

enable secret 5 $1$fJPx$6cewtXKQUnlACVq7eKsWo0

enable password cisco1

line vty 0 15

password cisco

no snmp-server

interface Vlan1

no shutdown

ip address 172.20.101.1 255.255.0.0

interface FastEthernet0/1

interface FastEthernet0/2

interface FastEthernet0/3

interface FastEthernet0/4

interface FastEthernet0/5

interface FastEthernet0/6

interface FastEthernet0/7

interface FastEthernet0/8

interface FastEthernet0/9

interface FastEthernet0/10

interface FastEthernet0/11

interface FastEthernet0/12

interface GigabitEthernet0/1

interface GigabitEthernet0/2

end

[0] Go to the IOS command prompt without saving this config.

[1] Return back to the setup without saving this config.

[2] Save this configuration to nvram and exit.

Enter your selection [2]:

Press Enter to take “2” as the default answer. Cisco will then display :

Building configuration...

[OK]

Use the enabled mode 'configure' command to modify this configuration.

Press RETURN to get started!

Congratulations, your switch is now setup with a name, password, and ip address.

B. Instructions to make it connect to the Force 10 switch

Type "enable"

Enter password of "cisco", Cisco will display :

cisco01>enable

Password:

cisco01#

Enter "configure terminal" to configure through the terminal, Cisco will display :

Enter configuration commands, one per line. End with CNTL/Z.

cisco01(config)#

Enter "interface GigabitEthernet 0/2" to configure the 2nd Gigabit port (the one to the right side), Cisco will display :

cisco01(config-if)#

Enter "speed nonegotiate" to turn off speed negotiation, Cisco will NOT return any console messages.

Enter "flowcontrol send off", Cisco will NOT return any console messages.

Enter "flowcontrol receive off", Cisco will NOT return any console messages.

Enter "exit" out of interface config mode

Enter "exit" out of config mode :

cisco01(config-if)#exit

cisco01(config)#exit

cisco01#

Type "write memory" and press Enter to write to memory :

Building configuration...

[OK]

cisco01#

The Cisco 2950 should now negotiate properly with the Force 10 Switch. Check the green link status lights on both switches to confirm that they connected.

C. Instructions for setting up 2950 ports to “Cluster Friendly” values

Type "enable", Enter password of "cisco", Cisco will display :

cisco01>enable

Password:

cisco01#

Enter "configure terminal" to configure through the terminal, Cisco will display :

Enter configuration commands, one per line. End with CNTL/Z.

cisco01(config)#

Type “spanning-tree vlan 1 forward-time 4” and press Enter. Cisco will NOT display any console messages after pressing Enter. This will set forward-time from a default of 15 seconds to 4 seconds, allowing quicker DHCP connections and prevention of timeouts from the cluster compute nodes.

Type “interface range fastEthernet 0/1 – 12” and press Enter. The spaces between the dash ARE important :

cisco01(config)#interface range fastEthernet 0/1 - 12

cisco01(config-if-range)#

Type “switchport host” and press Enter. The “host” command is a script that sets three options on the port. It enables “access” mode for each port, sets them to “spanning-tree portfast” and disables any “channel groups”. :

cisco01(config-if-range)#switchport host

switchport mode will be set to access

spanning-tree portfast will be enabled

channel group will be disabled

cisco01(config-if-range)#

Type “exit”, press Enter, type “exit” again and press Enter :

cisco01(config-if-range)#exit

cisco01(config)#exit

cisco01#

Type “copy running-config startup-config” and press Enter, this will change the default config to the values that you just entered :

cisco01#copy running-config startup-config

Destination filename [startup-config]?

Building configuration...

[OK]

Congratulations, the switch is now setup and should have no problems with DHCP, tftp, etc.

D. Instructions for setting up with a script through a tftp server

You can also setup the Cisco through a script that can by uploaded by a tftp server. First configure a switch using the examples above and then push the config to the tftp server.

Connect with Hyperterminal and press Enter.

Type “enable”, and enter the password :

cisco01>enable

Password:

cisco01#

Type “copy startup-config tftp:cisco/ciscoconfig”. You will then be prompted for the IP address of the tftp server and the filename you would like to save as :

cisco01#copy startup-config tftp:cisco/ciscoconfig

Address or name of remote host []? 172.20.1.1

Destination filename [cisco/ciscoconfig]?

The config file “ciscoconfig” will now be on the server in the //172.20.1.1:/tftpboot/cisco/ directory. If you get errors, make sure this directory already exists and has read/write access.

The following is a sample config file from our working DTF cluster :

version 12.1

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

hostname cisco01

enable secret 5 $1$bYmb$wt/YQBHa/hUgi6TRGhsYX.

enable password cisco

ip subnet-zero

ip name-server 172.20.1.1

ntp server 172.20.1.1

spanning-tree extend system-id

interface FastEthernet0/1

no ip address

spanning-tree portfast

switchport mode access

################## 0/2 – 0/11 removed to fit page ###########################

interface FastEthernet0/12

no ip address

spanning-tree portfast

switchport mode access

interface GigabitEthernet0/1

no ip address

interface GigabitEthernet0/2

no ip address

speed nonegotiate

flowcontrol send off

flowcontrol receive off

interface Vlan1

ip address 172.20.101.1 255.255.0.0

no ip route-cache

ip http server

logging 172.20.1.1

line con 0

password cisco

line vty 0 4

password cisco

line vty 5 14

password cisco

line vty 15

password cisco

end

Before pushing this config to other switches, change the IP address under the “interface Vlan1” section in the script file. Then follow these procedures to copy the config from the tftp server to the new switch.

Connect with Hyperterminal and press Enter.

Type “enable”, and enter the password :

cisco01>enable

Password:

cisco01#

Type “copy tftp:cisco/ciscoconfig startup-config”. You will then be prompted for the IP address of the tftp server and the filename you would like to copy :

cisco01#copy tftp:cisco/ciscoconfig startup-config

Address or name of remote host []? 172.20.1.1

Destination filename [startup-config]?

The config file “ciscoconfig” will now overwrite the default “startup-config” file.

Reboot the switch and it will now be using the new configuration.

E. Instructions to reset to Factory defaults (or, dohhh I want to start over !)

1. Unplug the power cable.

2. Press and hold down the “Mode” button on the front and plug the power cord back in.

3. Release “Mode” button when the following appears on the Hyperterminal screen :

C2950 Boot Loader (C2950-HBOOT-M) Version 12.1(11r)EA1, RELEASE SOFTWARE (fc1)

Compiled Mon 22-Jul-02 17:18 by antonino

WS-C2950G-12-EI starting...

Base ethernet MAC Address: 00:0b:5f:2a:95:80

Xmodem file system is available.

The system has been interrupted prior to initializing the

flash filesystem. The following commands will initialize

the flash filesystem, and finish loading the operating

system software:

flash_init

load_helper

boot

switch:

4. Type “flash_init” and press return, the Cisco will display the following :

Initializing Flash...

flashfs[0]: 17 files, 2 directories

flashfs[0]: 0 orphaned files, 0 orphaned directories

flashfs[0]: Total bytes: 7741440

flashfs[0]: Bytes used: 3961856

flashfs[0]: Bytes available: 3779584

flashfs[0]: flashfs fsck took 6 seconds.

...done initializing flash.

Boot Sector Filesystem (bs:) installed, fsid: 3

Parameter Block Filesystem (pb:) installed, fsid: 4

switch:

5. Type “load_helper” and press Enter. The Cisco will NOT return anything to the screen.

6. Type “dir flash:” and the switch file system will be displayed as shown below :

Directory of flash:/

2 -rwx 2664051 <date> c2950-i6q4l2-mz.121-11.EA1.bin

3 -rwx 273 <date> env_vars

4 -rwx 1082 <date> config.text

5 -rwx 5 <date> private-config.text

7 drwx 704 <date> html

19 -rwx 109 <date> info

20 -rwx 109 <date> info.ver

3779584 bytes available (3961856 bytes used)

switch:

7. Type “del flash:config.text” and press Enter. This is the file that stores all the configuration information as well as the passwords for the switch.

8. Type “boot” and press Enter. Cisco will then reboot and after scrolling through some messages display the following :

Model number: WS-C2950G-12-EI

System serial number: FHK0645Y17H

--- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes/no]:

Type “yes”, press Enter and then follow the same instructions found in this document under the section “Instructions to do initial configuration (Name/IP/Password)”