Confirm settings for uplink cisco 2960

Hi Experts,

I wanted to confirm if I have made a correct settings for these.

I have 3 Cisco 2960

on switch1

interface GigabitEthernet1/0/45
 switchport mode trunk
 channel-group 1 mode auto
!
interface GigabitEthernet1/0/46
 switchport mode trunk
 channel-group 1 mode auto
!
interface GigabitEthernet1/0/47
 switchport mode trunk
 channel-group 2 mode auto
!
interface GigabitEthernet1/0/48
 switchport mode trunk
 channel-group 2 mode auto


on switch2

interface GigabitEthernet1/0/47
 switchport mode trunk
 channel-group 1 mode auto
!
interface GigabitEthernet1/0/48
 switchport mode trunk
 channel-group 1 mode auto

on switch3

interface GigabitEthernet1/0/47
 switchport mode trunk
 channel-group 1 mode auto
!
interface GigabitEthernet1/0/48
 switchport mode trunk
 channel-group 1 mode auto



when I am on say switch 2 and I disconnect one of the uplink

I lose ping to the first switch, it will switch over to another link in about 5 ~10 secs
then when I plug it back in after 10~15 sec I lost a ping to the first switch for about 5~10 secs

I just want to confirm if this is correct.

My aim here is that I want the first swich to be the core and have uplink with redundant.
I would prefer that it doesn't drop the connection like it is now but if that's normal then I guess I have to live with.

But i thought just in case there is much better solution I wanted to ask you techs out there.

LVL 7
lucifer82Client Technology ManagerAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

gbarrientosCommented:
This is normal. The switch creates a route (path) based on the fastest connection (unless otherwise programmed.) It will use that route until something breaks it. In this case by you manually disconnecting the cable the route is broken. The switch the searches for a better route and resets the entry on the route table. This process takes the switch some time to fix, usually a few seconds. depending on the data being accessed this break may just appear to the user as a small hiccup.
lucifer82Client Technology ManagerAuthor Commented:
So the settings I have above is correct???

besides the fact that on switch 3 I have channel group 2 not 1


on switch3

interface GigabitEthernet1/0/47
 switchport mode trunk
 channel-group 2 mode auto
!
interface GigabitEthernet1/0/48
 switchport mode trunk
 channel-group 2 mode auto
gbarrientosCommented:
On the cor switch type
show interfaces port-channel 1
and
show interfaces port-channel 2

Post result.
Exploring ASP.NET Core: Fundamentals

Learn to build web apps and services, IoT apps, and mobile backends by covering the fundamentals of ASP.NET Core and  exploring the core foundations for app libraries.

gbarrientosCommented:
The group number is merely a "name" this is "name" is not passes on to the other switches.
lucifer82Client Technology ManagerAuthor Commented:
Also if I add another two links between switch 2 and 3

on switch2

interface GigabitEthernet1/0/45
 switchport mode trunk
 channel-group 3 mode auto
!
interface GigabitEthernet1/0/46
 switchport mode trunk
 channel-group 3 mode auto

on switch3

interface GigabitEthernet1/0/45
 switchport mode trunk
 channel-group 3 mode auto
!
interface GigabitEthernet1/0/46
 switchport mode trunk
 channel-group 3 mode auto

would this work??
gbarrientosCommented:
what are you trying to accomplish, ether-channels are more for load balancing not for redundancy.
gbarrientosCommented:
I just read something that says ether-channels numbers are important and must be used the same on both ends. Take a look at this this:
http://www.networkfoo.org/cisco-labs/lab-4-configuring-etherchannel-two-cisco-2950-switches
lucifer82Client Technology ManagerAuthor Commented:
I need a solution where I have a redundant link so incase any one of the link goes I still have connection to core 1 switch

using portchannel was an idea but if there is better way of doing this it would be great if you can suggest them.
gbarrientosCommented:
I'm having a hard time picturing the scenario. You have 3 switches, Switch 1 is your core which connects to 2 other switches. You want switch 1 to have 2 up-links to each switch?
lucifer82Client Technology ManagerAuthor Commented:
I have 3 switches

switch 1 port 45 & 46 goes to switch 2 port 47&48
switch 1 port 47 & 46 goes to switch 3 port 47&48

and I just added

switch 2 port 45&46 goes to switch 3 port 45&46
gbarrientosCommented:
So kinda like a triangle?

Try This:

SW1#
configure terminal
interface range fastethernet 1/0/45 - 46
channel-group 1 mode desirable
interface range fastethernet 1/0/47 - 48
channel-group 3 mode desirable

SW2#
configure terminal
interface range fastethernet 1/0/45 - 46
channel-group 2 mode desirable
interface range fastethernet 1/0/47 - 48
channel-group 1 mode desirable

SW3#
configure terminal
interface range fastethernet 1/0/45 - 46
channel-group 2 mode desirable
interface range fastethernet 1/0/47 - 48
channel-group 3 mode desirable

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
gbarrientosCommented:
Did this work?
lucifer82Client Technology ManagerAuthor Commented:
yes it did thanks for your help
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Switches / Hubs

From novice to tech pro — start learning today.