Stackwise

Switch#sh switch stack-ports
Switch #    Port 1       Port 2
——–    ——       ——
1           Ok          Down
2           Ok          Down

To show stack ports status, currently only stack 1 is connected to each other. There are Stack 1 and Stack 2 for one WS-3750G-24TS

Switch#sh switch
Switch/Stack Mac Address : 0817.358d.ea00
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*1       Master 0817.358d.ea00     1      0       Ready
2       Member 0817.35ba.ec80     1      0       Ready

This command is to show which switch is the master of the stack. The master switch’s mac address is the mac address of the switch stack.

Adjust switch priority

Switch(config)#switch ?
<1-9>  Switch Number

Choose a switch number to configure.

Switch(config)#switch 1 priority ?
<1-15>  Switch Priority

Default priority is 1, this can be adjusted. For this example I am adjusting Switch number 1’s priority to 15.

Switch(config)#switch 1 priority 15
Changing the Switch Priority of Switch Number 1 to 15
Do you want to continue?[confirm]
New Priority has been set successfully

Verify switch priority

Switch(config)#do sh switch
Switch/Stack Mac Address : 0817.358d.ea00
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*1       Master 0817.358d.ea00     15     0       Ready
2       Member 0817.35ba.ec80     1      0       Ready

Verified that Switch 1 has changed its priority to 15.

Election starts while switch is rebooting

During rebooting stack switch election starts:

SM: Detected stack cables at PORT1

Waiting for Stack Master Election…
SM: Waiting for other switches in stack to boot…
#######################################################################################################################
SM: All possible switches in stack are booted up

POST: PortASIC CAM Subsystem Tests : Begin
POST: PortASIC CAM Subsystem Tests : End, Status Passed

POST: PortASIC Port Loopback Tests : Begin
POST: PortASIC Port Loopback Tests : End, Status Passed

Election Complete
Switch 2 booting as Master
Waiting for Port download…Complete

Switch stack status during election

Switch(config)#do sh sw
Switch/Stack Mac Address : 0817.358d.ea00
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*1       Master 0817.358d.ea00     1      0       Ready
2       Member 0817.35ba.ec80     0      2       Waiting

Switch(config)#do sh sw
Switch/Stack Mac Address : 0817.358d.ea00
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*1       Master 0817.358d.ea00     1      0       Ready
2       Member 0817.35ba.ec80     10     2       Progressing

Which switch boots up first is the master of the stack, in this scenario a new switch with higher priority is added to the switch stack.

Switch/Stack Mac Address : 0817.358d.ea00
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*1       Master 0817.358d.ea00     1      0       Ready
2       Member 0817.35ba.ec80     10     0       Ready

Switch with a higher priority than master switch will not take over the master role, it will remain as member until the master switch fails or reboot.

Syslog after the whole election completed

Switch(config)#
00:06:47: %STACKMGR-4-SWITCH_ADDED: Switch 2 has been ADDED to the stack
00:06:58: %STACKMGR-5-SWITCH_READY: Switch 2 is READY
00:06:58: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Switch 2 has changed to state UP
00:06:58: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Switch 2 has changed to state DOWN
00:01:10: %STACKMGR-4-SWITCH_ADDED: Switch 1 has been ADDED to the stack (Switch-2)
00:01:10: %STACKMGR-4-SWITCH_ADDED: Switch 2 has been ADDED to the stack (Switch-2)
00:01:12: %SPANTREE-5-EXTENDED_SYSID: Extended SysId enabled for type vlan (Switch-2)
00:01:20: %SYS-5-CONFIG_I: Configured from memory by console (Switch-2)
00:01:20: %STACKMGR-5-SWITCH_READY: Switch 1 is READY (Switch-2)
00:01:20: %STACKMGR-5-MASTER_READY: Master Switch 1 is READY (Switch-2)
00:01:20: %STACKMGR-5-SWITCH_READY: Switch 2 is READY (Switch-2)
00:01:21: %SYS-5-RESTART: System restarted — (Switch-2)
Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(35)SE5, RELEASE SOFTWARE (fc1) (Switch-2)
Copyright (c) 1986-2007 by Cisco Systems, Inc. (Switch-2)
Compiled Thu 19-Jul-07 19:15 by nachen (Switch-2)

Telnet to the switch stack on any port belonging to switch 1 and 2

A switch stack connectivity is controlled by the back plane stack cables, hence access the switch via telnet is possible on any stack within a switch stack.

When the master stack is down

Switch/Stack Mac Address : 0817.358d.ea00
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*1       Master 0817.358d.ea00     1      0       Ready
2       Member 0000.0000.0000     0      0       Provisioned

Change switch number

Switch#sh switch
Switch/Stack Mac Address : 0817.35ba.ec80
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*2       Master 0817.35ba.ec80     10     0       Ready

Switch(config)#switch 2 renumber 3
WARNING: Changing the switch number may result in a
configuration change for that switch.
The interface configuration associated with the old switch
number will remain as a provisioned configuration.
Do you want to continue?[confirm]
Changing Switch Number 2 to Switch Number 3
New Switch Number will be effective after next reboot

Reload switch in the switch stack

Switch#sh switch
Switch/Stack Mac Address : 0817.35ba.ec80
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
1       Member 0817.358d.ea00     1      0       Ready
*2       Master 0817.35ba.ec80     10     0       Ready

I want to reload switch 2 in the switch stack.

Switch#reload slot 2
Proceed with reload? [confirm]
Switch 2 reloading…

Switch#sh sw
Switch/Stack Mac Address : 0817.358d.ea00
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*1       Master 0817.358d.ea00     1      0       Ready
2       Member 0000.0000.0000     0      0       Provisioned

Switch 2 is rebooting.

Switch#sh sw
Switch/Stack Mac Address : 0817.358d.ea00
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*1       Master 0817.358d.ea00     1      0       Ready
2       Member 0000.0000.0000     0      0       Provisioned
3       Member 0817.35ba.ec80     10     2       Progressing

Remember that the switch 2 has been renumbered to 3?

Switch#sh sw
Switch/Stack Mac Address : 0817.358d.ea00
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*1       Master 0817.358d.ea00     1      0       Ready
2       Member 0000.0000.0000     0      0       Provisioned
3       Member 0817.35ba.ec80     10     0       Ready

Previously provisioned mac address in the switch stack is not removed.

Remove switch provision from the switch stack

Switch(config)#no switch 2 provision

Switch(config)#do sh sw
Switch/Stack Mac Address : 0817.358d.ea00
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*1       Master 0817.358d.ea00     1      0       Ready
3       Member 0817.35ba.ec80     10     0       Ready

Switch 2 removed.

Provision switch to the switch stack

Supposed two weeks later a new switch will be added to the switch stack, you can provision the new switch into the switch stack first.

Switch(config)#switch 4 provision ?
nme-xd-24es-1s         provision an EtherSwitch SM with 24+1G interfaces
nme-xd-24es-1s-p       provision an EtherSwitch SM with 24+1G interfaces
ws-c3750-24fs          provision a Catalyst 3750 switch with 24FX+2G
interfaces
ws-c3750-24p           provision a Catalyst 3750 switch with 24pwr+2G
interfaces
ws-c3750-24ts          provision a Catalyst 3750 switch with 24+2G interfaces
ws-c3750-48p           provision a Catalyst 3750 switch with 48pwr+4G
interfaces
ws-c3750-48ts          provision a Catalyst 3750 switch with 48+4G interfaces
ws-c3750e-24pd         provision a Catalyst 3750E switch with 24GPwr+2TenG
interfaces
ws-c3750e-24td         provision a Catalyst 3750E switch with 24G+2TenG
interfaces
ws-c3750e-48pd         provision a Catalyst 3750E switch with 48GPwr+2TenG
interfaces
ws-c3750e-48td         provision a Catalyst 3750E switch with 48G+2TenG
interfaces
ws-c3750g-12s          provision a Catalyst 3750 switch with 12G interfaces
ws-c3750g-12s-d        provision a Catalyst 3750 switch with 12G interfaces
and DC power supply
ws-c3750g-16td         provision a Catalyst 3750 switch with 16G+1XENPAK
interfaces
ws-c3750g-24ps         provision a Catalyst 3750 switch with 24Gpwr+4G
interfaces
ws-c3750g-24t          provision a Catalyst 3750 switch with 24GTX interfaces
ws-c3750g-24ts         provision a Catalyst 3750 switch with 24GTX+4G
interfaces
ws-c3750g-24ts-1u      provision a Catalyst 3750 switch with 24GTX+4G
interfaces
ws-c3750g-24ws-s25/50  provision a Catalyst 3750 switch with 24Gpwr+2G
interfaces + Wireless Controller
ws-c3750g-48ps         provision a Catalyst 3750 switch with 48Gpwr +4G
interfaces
ws-c3750g-48ts         provision a Catalyst 3750 switch with 48GTX+4G
interfaces

The supported types are listed as shown above.

Supposed the new switch that will be coming 2 weeks later is WS-C3750-48ts:

Switch(config)#switch 4 provision ws-c3750-48ts

Switch(config)#do sh switch
Switch/Stack Mac Address : 0817.358d.ea00
H/W   Current
Switch#  Role   Mac Address     Priority Version  State
———————————————————-
*1       Master 0817.358d.ea00     1      0       Ready
3       Member 0817.35ba.ec80     10     0       Ready
4       Member 0000.0000.0000     0      0       Provisioned

Advertisements
This entry was posted in Stackwise, Switch and tagged . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s