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August 4th, 2020 20:00
Connecting a new switch, unable to access management port from old switch
I have 2 switches:
Dell PowerConnect 5524
Dell N2048P (new)
I have just added the N2048P into the network and connected the switches together via a trunked ethernet port.
Topology:
PC <-> Switch 5524 <--Trunked via single port with all vlans tagged on both sides--> Switch N2048P
Management Ips:
5524 - 10.10.10.71 (vlan1)
2048 - 10.10.10.45 (vlan1)
I cannot access the management IP of the new 2048 if I am connected into the 5524 switch. (request timed out).
I can access it if I am connected into the 2048 directly.
What steps should I take to troubleshoot this? I thought it would just work. What should I look for?
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DELL-Josh Cr
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August 5th, 2020 09:00
Hi Nardog14,
Is your management PC on VLAN 1 as well? Do other VLANs pass their traffic across the trunk port properly?
DELL-Josh Cr
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August 5th, 2020 10:00
Yes setting the ports to trunk and tagged for all packets should work. How many VLANs are you passing? Does the link status show up?
Nardog14
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August 5th, 2020 10:00
The management PC is on vlan1, yes. It seems as though no traffic at all is making it between the switches. I have no idea why it would not work. Is there more to it than just setting both switches to trunk on the necessary port with all vlans tagged? Is there a preferred method to test this using resources on the switch itself?
Nardog14
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August 5th, 2020 12:00
Hi Josh,
Yes, I am passing 15 vlans over the trunk. Link shows as up/enabled.
Port 18
DELL-Josh Cr
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August 5th, 2020 13:00
In the vlan list it lists them with an I, which is for inactive configuration.
Nardog14
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August 5th, 2020 14:00
I guess I do not entirely understand that. When I choose trunk, it auto populates that list. I cannot add a new VLAN number to it. When I add or remove and hit apply, the list just comes back with none of them saved and it has an (i) next to it again. On the VLAN membership page, it shows it as being tagged everywhere, yet in that list shows the (i). What gives?
Images show port 18 as T tagged on vlan 150 and 350, yet in the list on the port config page in previous post, both 150 and 350 show an (i) next to them.
DELL-Josh Cr
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August 5th, 2020 14:00
Try doing it from CLI and see if that works. Page 882 https://dell.to/2XxEx63
Nardog14
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August 5th, 2020 20:00
I will try tomorrow when I am on site.
Looks like this is the running config for that port:
So, for some reason, the UI after setting it to trunk mode, used general to add the vlans? Very strange.
Thanks for the help so far. Will update soon.
Nardog14
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August 12th, 2020 08:00
Hi Josh,
Just an update - I am still unable to get this to work.
The two switches connected have the following configs now and I cannot still access the management port of the new switch without being plugged directly into it. Below are the show run results for each interface:
2048:
interface Gi2/0/30
speed auto 1000
description "trunk to 71"
switchport mode trunk
5524:
interface gigabitethernet1/0/18
description "main sw to 2048"
switchport mode trunk
switchport trunk allowed vlan remove 1-49,51-149,151-249,251-349
switchport trunk allowed vlan remove 351-449,451-549,551-699,701-749
switchport trunk allowed vlan remove 751-759,761-769,771-779,781-849
switchport trunk allowed vlan remove 851-2109,2111-2114,2116-4094
On the 2048 config, do I need to allow vlans? Its default to include them all.
Thanks
DELL-Chris H
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August 12th, 2020 11:00
It looks like you removed VLAN 1 on 5524. You would need to add it back before it can talk.
Nardog14
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August 21st, 2020 12:00
Hi Chris,
I have changed it and now the running config shows vlan 2-49, etc etc. I still cannot access anything on the new switch from the old with a trunk between. I have changed ports as well changed both switchports to general mode just to see if I could pass VLAN 1 across to get to the management IP and I cannot. It seems as though it is definitely an issue with the 2048. Is there another setting that would prevent any type of switch to switch communication or anything else I can try/log I can share to help diagnose this?
DELL-Josh Cr
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August 21st, 2020 13:00
You could try mirroring the port and using wireshark to see what data is or isn’t passing. Page 599 https://dell.to/32fnibb