I have a simple setup that's not working and I could really use some help.
Network Overview
Firewall - LAN 1 - 10.1.1.1 with a sub-interface VLAN 9 - 10.1.9.1
Switch 1- VLAN 1 - 10.1.1.2, VLAN 9 (no IP)
Switch 2 - VLAN 1 - 10.1.1.3, VLAN 9 (no IP)
VLAN 1 holds general PC traffic
VLAN 9 holds traffic for some Server Lab Traffic
Firewall port 1 connects to Switch1, Port 1
Switch 1, Port 48 connect to Switch 2, Port 1
Problem
Right now, my laptop is the only thing I connect to a VLAN 1 port, and I move that between switches as needed. 2 devices are plugged into VLAN 9. The problem is that Switch 2 keeps going down. Port 48 on Switch 1 flaps. Port 1 on Switch 2 Flaps. This seems to happen when things are connected/disconnected from ports.
I have replaced cables, used different ports, checked for rx/tx/etc errors and there are none. The flapping will continue forever unless I intervene. If I disconnect the cable between the two switches then re-connect, it stablizes.
When the problem happens, the logs look like this:
Switch 1 show log -r output
10/02/24 18:55:31 00077 ports: port 48 is now off-line
I 10/02/24 18:54:30 00076 ports: port 48 is now on-line
I 10/02/24 18:54:27 00077 ports: port 48 is now off-line
I 10/02/24 18:54:23 00076 ports: port 48 is now on-line
I 10/02/24 18:54:17 00077 ports: port 48 is now off-line
I 10/02/24 18:54:15 00076 ports: port 48 is now on-line
I 10/02/24 18:54:06 00077 ports: port 48 is now off-line
I 10/02/24 18:54:05 00076 ports: port 48 is now on-line
I 10/02/24 18:54:02 00077 ports: port 48 is now off-line
I 10/02/24 18:54:01 00076 ports: port 48 is now on-line
I 10/02/24 18:53:58 00077 ports: port 48 is now off-line
I 10/02/24 18:53:57 00076 ports: port 48 is now on-line
Switch 2 show log -r output
I 10/03/24 10:24:32 00076 ports: port 1 is now on-line
I 10/03/24 10:24:27 00077 ports: port 1 is now off-line
I 10/03/24 10:24:25 00076 ports: port 1 is now on-line
I 10/03/24 10:24:20 00002 vlan: AccessControl virtual LAN disabled (9 times in 60 seconds)
I 10/03/24 10:24:20 00002 vlan: DEFAULT_VLAN virtual LAN disabled (9 times in 60 seconds)
I 10/03/24 10:24:20 00077 ports: port 1 is now off-line
I 10/03/24 10:24:18 00001 vlan: AccessControl virtual LAN enabled (9 times in 60 seconds)
I 10/03/24 10:24:18 00001 vlan: DEFAULT_VLAN virtual LAN enabled (9 times in 60 seconds)
I 10/03/24 10:24:18 00076 ports: port 1 is now on-line
I 10/03/24 10:24:12 00077 ports: port 1 is now off-line
I 10/03/24 10:24:11 00076 ports: port 1 is now on-line
I 10/03/24 10:24:05 00077 ports: port 1 is now off-line
Overview and configuration look like this:
Firewall - LAN 1 - 10.1.1.1 with a sub-interface VLAN 9 - 10.1.9.1
Switch 1- VLAN 1 - 10.1.1.2, VLAN 9 (no IP)
Switch 2 - VLAN 1 - 10.1.1.3, VLAN 9 (no IP)
VLAN 1 holds general PC traffic
VLAN 9 holds traffic for some Server Lab Traffic
Firewall port 1 connects to Switch1, Port 1
Switch 1, Port 48 connect to Switch 2, Port 1
*******SWITCH 1*******
vlan 1
name "DEFAULT_VLAN"
no untagged 13-15
untagged 1-12,16-47
tagged 48
ip address 10.1.1.2 255.255.255.0
exit
vlan 9
name "VLAN9"
untagged 13-15
tagged 1,48
no ip address
exit
*******SWITCH 2*******
vlan 1
name "DEFAULT_VLAN"
no untagged 3-9
untagged 2,10-48
tagged 1
ip address 10.1.1.3 255.255.255.0
exit
vlan 9
name "VLAN9"
untagged 3-9
tagged 1
no ip address
exit
My guess is that I have something wrong with the no tagged/tagged/untagged settings. Anyone have any idea what the issue is? I'm stumped.