08-21-2013 07:10 PM - edited 03-07-2019 03:03 PM
Hello All,
Could someone please confirm if we can stack the two 3750x switches together as the following -
Will this also provide 32 stack ring speed?
Thank you in advance.
Kind regards,
Jay
Solved! Go to Solution.
08-21-2013 07:15 PM
No. "X" them.
08-21-2013 08:04 PM
...and when correctly cabled as Leo noted, the theoretical Stackwise Plus maximum bandwidth is 64 Gbps if you're using 3750X's. (32 Gbps is for the older StackWise technology on the non-E and non-X 3750).
Lots of details in this Cisco Live presentation and this whitepaper.
08-21-2013 07:15 PM
No. "X" them.
08-21-2013 08:04 PM
...and when correctly cabled as Leo noted, the theoretical Stackwise Plus maximum bandwidth is 64 Gbps if you're using 3750X's. (32 Gbps is for the older StackWise technology on the non-E and non-X 3750).
Lots of details in this Cisco Live presentation and this whitepaper.
08-21-2013 10:25 PM
Hi Leo,
Thank you for the reply.
could you please explain what issues can occur if they are not 'X 'connected
Would it cause only one stack port on each switch to be up and the other to be down?
The reason I am asking this is becuse I have got a switch which stacked in this manner at the remote location and I can see that stack port 2 on both the switches are in down state.
Can it be a faulty cable?
Thanks
Jay
08-21-2013 10:28 PM
could you please explain what issues can occur if they are not 'X 'connected
One side is "out" and the other side is "in". So you've connected both "in" together and both "out".
Besides, Cisco's documentation recommends the cables to be crossed. Why re-inventing the wheel?
08-22-2013 12:01 AM
Thanks Leo
08-22-2013 03:49 AM
Thanks for rating our posts, Jay.
08-22-2013 04:08 AM
Hi Leo,
It was my understanding that you must cable to ports the make a continuous ring.I wasn't aware of in/out ports.
I have seen the following stackwise cable layout in production:
...and working at full 32G (it was a mixed G and X stack).
cheers,
Seb.
08-22-2013 04:13 AM
Seb,
What you have is fine, because you are "X" or crossing them (even though the first and last are straight down). Take two and do what the OP did, from what I learnt long time ago, it won't work.
08-22-2013 04:46 AM
Hi vidi,
make the two switches in X connection it will give you full bandwidth will full stack speed
08-22-2013 07:28 AM
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Posting
My understanding, yes you can connect two units like that. I.e. how the ring is connected doesn't really matter, except perhaps for visual neatness.
Issue this command:
3750X#sh switch stack-ring speed
Stack Ring Speed : 32G
Stack Ring Configuration: Full
Stack Ring Protocol : StackWisePlus
And you're good if you have the 32G (duplex) and "Full" (regardless of "X" connected or "vertically" connected).
As noted by another poster, the 3750-X provides 64 Gbps stack bandwidth (I believe StackWisePlus ports to be 16 Gbps, duplex).
08-22-2013 06:07 PM
Hi Josheph,
Thank you for the reply. The reason I asked that question is because i saw stack port 2 on both the switches in down state.
Stack Port Status Neighbors
Switch# Port 1 Port 2 Port 1 Port 2
--------------------------------------------------------------------
1 Ok Down 2 None
2 Ok Down 1 None
So I was wondering if this kind of stacking topology would cause it. The stack is operating in 16G.
08-23-2013 05:25 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Have you tried reseating the down stack port connectors? What does show switch stack-ports summary reveal?
BTW, if you look here: http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/hardware/quick/guide/3750GSG3.html#wp53466 or
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750x_3560x/hardware/installation/guide/HIGINSTL.html#wp1151552. You'll see different ways of connecting the same units. Note how sometimes stack ports 1 or 2 connect to another stack port 1 or 2, i.e. they are not always cross connected.
08-23-2013 10:30 AM
Hi Joseph,
I have similar issue here where 2 stack switches are connected via single cable and it is not crossed.
As it is in production so i can not cross them.
I added second cable it still shows down down.
sh switch neighbors
Switch # Port 1 Port 2
-------- ------ ------
1 2 None
2 1 None
Stack Port Status Neighbors
Switch# Port 1 Port 2 Port 1 Port 2
--------------------------------------------------------
1 Ok Down 2 None
2 Ok Down 1 None
#sh switch stack-ports summary
Switch#/ Stack Neighbor Cable Link Link Sync # In
Port# Port Length OK Active OK Changes Loopback
Status To LinkOK
-------- ------ -------- -------- ---- ------ ---- --------- --------
1/1 OK 2 50 cm Yes Yes Yes 1 No
1/2 Down None 50 cm No No No 0 No
2/1 OK 1 50 cm Yes Yes Yes 1 No
2/2 Down None 50 cm No No No 0 No
So by default when they are not crossed even though both cables are connected only one link will be up up at one time?
Regards
MAhesh
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