Configuration for 2960s and 9500 core

[sphillips]

I'm fairly new to networking and will try to explain my situation. I have a Cisco Network which consist of a 2 stacked 9500s in my MDF, 3 stacked 9200Ls in the same MDF and a couple other IDF closets each having two stacked 9200Ls. I also have a full 2960 that is connected to Te1/0/5 on core #1. Port Te1/0/5 on core #1 is configured as an etherchannel for vlan14 for the 2960. Port Te2/0/5 on core #2 is configured the same as Te1/0/5 but not in use. I believe this port is used for redundancy for the 2960 but could be wrong.

I'm needing assistance on the easiest way to connect a second 2960 to the same 9500 core. The second 2960 is also vlan 14. I'm pretty sure I could connect it using any fast ethernet port on the first 2960 but didn’t want to daisy chain them together. I would rather connect the second 2960 directly to the 9500 core. What would be the easiest way? Could I connect it to that unused port on core #2 (Te2/0/5) since both 2960s are on the same vlan 14 and have different IPs? I have plenty of unused ports on the core so it maybe easier to give the second 2960 a different IP and vlan altogether. But that will require me to have to configure an unused port on the core. I can't do anything that will affect the network as far as bringing anything down and I'm new when it comes to CLI. 

[balaji.bandi]

This is a bit confusing for me to understand -  what connection going where. can you please make a small network Diagram so you sure there is no loops in the network?  and for you easy map moving forward, this help you when you doing troubleshooting easy.

[sphillips]

Yes sorry. I will attach a hand drawing for now but if you don’t understand, I'll create an actual topology diagram in a couple of days.

I have 2 stacked 9500s (CORE). It has several vlans but I'm only concerned about vlan14 (gi1/0/5 and gi2/0/5). When I do a sh vlan on the CORE, gi1/0/5 and po6 is configured for vlan14. Gi2/0/5 is the only member of po6. The only connection from CORE to 2960 (A) is at gi2/0/5. There is NO physical connection from CORE gi1/0/5 to 2960 (A) but I'm not sure why? I think gi1/0/5 is meant for redundancy but we didn't have a sfp and didn't connect it.

I'm needing to add an additional 2960 (B). The 2960 (B) used to be daisy chained to 2960 (A). I don't like that because if we lost 2960 (A) we would also lose 2960 (B). I want to connect 2960 (B) to CORE. Can I plug it into CORE gi1/0/5 since it isn't in use and everything is configured to valn14?

[balaji.bandi]

It is a standard setup, i do not see anything wrong, yes it works as expected. (but look my comments below)

 Can I plug it into CORE gi1/0/5 since it isn't in use and everything is configured to valn14?

If the 1/0/5 has been configured and part of any port-channel

then default the configuration, make it a Trunk port and allow VLAN 14 or any other vlan required.

config t

default Interface gi 1/0/5

!

Interface gi 1/0/5

switchport

switchport mode trunk

switchport trunk allowed vlan 1,14   (i generally allow vlan1 as standard default native vlan)

Other side same

need to create vlan 14 on new switch.

[sphillips]

Thank you for the info. Yes, the new switch already has vlan14 created. On the CORE, I believe gi1/0/5 is already configured for trunk as well. Gi1/0/5 config should look the exact same as gi2/0/5 but is not apart of any port channel. I wasn't sure if I could simply connect it as it is or had to worry about creating a new port channel or assigning it to po6.

As far as the 2960, I can plug into any of the fa interfaces since they are all vlan14, correct?

[balaji.bandi · Accepted solution]

If you have concerns post 

show run interface gi 1/0/5 to verify ( as long its not part of any exiting port-channel good, but please do verify)

You need to configure any port on the switch 29XX ( we prefer to use uplink ports) with the same trunk config.

To make standard, i configure same way A configured port (but not port-channel just trunk, if you do not have any plan to build link bundle  here)

[sphillips]

Thank you!! I will be back to work on Tuesday and will check gi1/0/5 config first to verify and will proceed with hook up. I'll reach back out if I have any issues. Appreciate you!