• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 329
  • Last Modified:

Cisco switch issue

I have a stack of cisco 3750 switches connected using the stack-wise cables. Hence switch 1 is connected to 2, 2 to 3, 3 to 4 etc. switch 6 is connected back to 1.
 So there is a path to all switches if any switch fails.

here is a show stack output :

 1       Member bc16.650e.3a80     1      3       Ready
 2       Member e4d3.f11e.0300     2      3       Ready
 3       Member 6073.5c30.eb00     5      3       Ready
*4       Master 0006.f6bb.8500     15     3       Ready
 5       Member 6073.5c32.1300     4      3       Ready
 6       Member 4c4e.353a.bb00     3      3       Ready

When I removed the power from switch 1 switches 1 2 and 3 went down 4,5, and 6 stayed up. the sh switch said they were 'removed'.

 1       Member bc16.650e.3a80     1      3       removed
 2       Member e4d3.f11e.0300     2      3       removed
 3       Member 6073.5c30.eb00     5      3       removed
*4       Master 0006.f6bb.8500     15     3       Ready
 5       Member 6073.5c32.1300     4      3       Ready
 6       Member 4c4e.353a.bb00     3      3       Ready

 They came back when I powered on switch 1. I a, confused about this. I have read the cisco stuff on it but I can not get a definative answer regarding if this is normal or not.
0
tjwoollard
Asked:
tjwoollard
  • 3
  • 3
  • 2
  • +1
1 Solution
 
ryan80Commented:
No, this is not normal. The other switches should stay in the stack.
0
 
Jordan MedlenCommented:
I would check the stack cables between 3 and 4. Those stack cables for the 3750s are something awful, and I have had to reseat some in the past. It's possible that when you unplugged 1, that was providing the path to to 2 and 3 as far as the rest of the stack is concerned.

Check the logs on switch 3 and switch 4 to see if there are any entries regarding the stack at that point. Other than what I have mentioned, there could be something more seriously wrong.
0
 
Craig BeckCommented:
Are these 3750X switches using StackPower?
0
WEBINAR: 10 Easy Ways to Lose a Password

Join us on June 27th at 8 am PDT to learn about the methods that hackers use to lift real, working credentials from even the most security-savvy employees. We'll cover the importance of multi-factor authentication and how these solutions can better protect your business!

 
tjwoollardAuthor Commented:
no they are no using stack power. each switch is supplied with 2 power supplies.
0
 
Craig BeckCommented:
Can you post the show switch neighbor and show switch stack-ports output?
0
 
tjwoollardAuthor Commented:
here it is but i can see the issue

hstack1#sh switch ne
  Switch #    Port 1       Port 2
  --------    ------       ------
      1         2             6
      2         3             1
      3        None           2
      4         5            None
      5         6             4
      6         1             5

1           Ok           Ok
    2           Ok           Ok
    3          Down          Ok
    4           Ok          Down
    5           Ok           Ok
    6           Ok           Ok
0
 
Jordan MedlenCommented:
As I stated, looks to be an issue with your stack cable between member switches 3 and 4. Try swapping or reseating the cable.
0
 
Craig BeckCommented:
So there's your answer...

Switch 3 doesn't link to switch 4.  Therefore you have a break in your stack.  The only way to get to switch 3 from the master is via switch 1.

If you connect a stack cable between switch 3 and switch 4 you can remove the power from switch 1 and switches 2 and 3 will stay up in the stack.
0
 
tjwoollardAuthor Commented:
OK
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

  • 3
  • 3
  • 2
  • +1
Tackle projects and never again get stuck behind a technical roadblock.
Join Now