stack port

[Ibrahim Jamil]

Hi Folks

I have 2 switches 3750 connected togather via 2 stack cables,now  i i wana add onother third switch but no more stack ports on the 2 switches,so how can add this third switch to stack to  get benefits from stackwise?

[kapathak]

Assuming the stack connection right now looks like this:

Switch 1: Stackport 1 connected to Switch2: Stackport 2

Switch 1: Stackport 2 connected to Switch 2: Stackport 1

(Criss-cross)

If you want to add the third switch, the connection would like this:

Switch1: Stackport 1 connected to Switch 2: Stackport 2

Switch2: Stackport 1 connected to Switch 3: Stackport 2

Switch3: Stackport 1 connected to Switch1: Stackport 2

Hope this makes sense.

[ranraju]

On this link, you can take a look at figure 5-2, thats how the 3 switches are stacked as full ring with 3 stackwise cables....

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.1_19_ea1/configuration/guide/swstack.html#wp1142379

Hope this answered your question...

Regards,

Ranganath

[Ibrahim Jamil]

Hi Kapil

how to config the stack features acording ur suggestion? to elect switch as master ,and later  if i want to choose switch2 as mater?

what if i want to connect onother switch 4 according ur suggesting

[ranraju]

For you to elect a switch as the master you need assign higher priority value for that switch, if you want switch2 to be the master, the command that you need to use in the config mode is: switch 2 priority new-priority-value. The highest priority value that can be assigned here is 15. So for the switch 2 to become master you need to assign a priority value which should be greater than the priority values of the other 2 switches in the stack. And note that the switch 2 becomes the master only on the next reload of the switch stack. Use the command "show switch" or "show switch detail" to check the priority values assigned to each switch in the stack.

And if you are connecting the 4th switch, then the stack wise connections should look like this...

SW1 Port1 ---to--- SW2 Port2

SW2 Port1 ---to--- SW3 Port2

SW3 Port1 ---to--- SW4 Port2

SW4 Port1 ---to--- SW1 Port2

Hope this helps...

Regards,

Ranganath

[Ibrahim Jamil]

thanks,would y please post me the commands needed for config and verification from ur point of view?

[ranraju]

These commands should be sufficient to verify the stack configurations and stackwise cable connections:

1. show switch stack-ports

2. show switch detail

For configurations:

1. switch sw_num priority

2. switch sw_num provision

3. switch sw_num renumber new_num 

For more details on these commands and their use, please refer the following link...

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_25_see/configuration/guide/swstack.html#wp1110719

I hope this helps...

Regards,

Ranganath

[Ibrahim Jamil]

Thanks folks