ICX Switches | 7150, 7450 | LAG Issue | Redundancy

[rajivw]

Hi everyone,

We have deployed couple of ICX-7150 Switches as the Access layer (Multiple floors / stacks) and 2x ICX-7450 as the Core. All the access switch stacks are getting connected to the core via 2x 1G links (Eg: 3-switch stack group; 1 link from the top switch of the stack to core SW1 and 1 link from bottom switch of the stack to core SW2 - LAGed). 

All the LAGs are up and functioning properly. When we disconnect one link physically, the LAG is still up and the connectivity remains the same.

However, for few floors / stacks, when we disconnect one physical link of the LAG, both physical links go down and the LAG also goes down. When we reconnect the link again, both come up again and the LAG is online.

Appreciate your advice on this.

[tim_brumbaugh]

So how is your lag configured on each end and are you running loop protect and spanning-tree.  If you are ssh'ed  into the switch and monitor the pot that is not unplugged what happens to it.  Turn on console logging and have the event logged dumped to the screen.  Do this on each end to see if it reacts the same and you get the same events.  Are there any errors on the ports that are connected between the core and the stacks?

[rajivw]

Hi @tim_brumbaugh,

Yes, STP is enabled. I've shared below the configs for Core and Access (10th floor). I will share the event logs once I get access again to the network. When I compared the configs of 10th floor stack with a functional stack (No LAG issue), configs are all identical. 

[rajivw]

SSH@Access-10thFloor#sh run
Current configuration:
!
ver 08.0.90dT211
!
stack unit 1
  module 1 icx7150-48pf-poe-port-management-module
  module 2 icx7150-2-copper-port-2g-module
  module 3 icx7150-4-sfp-plus-port-40g-module
  priority 255
  stack-port 1/3/1
  stack-port 1/3/3
stack unit 2
  module 1 icx7150-24p-poe-port-management-module
  module 2 icx7150-2-copper-port-2g-module
  module 3 icx7150-4-sfp-plus-port-40g-module
  priority 240
  stack-port 2/3/1
  stack-port 2/3/3
stack unit 3
  module 1 icx7150-24p-poe-port-management-module
  module 2 icx7150-2-copper-port-2g-module
  module 3 icx7150-4-sfp-plus-port-40g-module
  stack-port 3/3/1
  stack-port 3/3/3
stack enable
stack mac 70ca.9719.8f58
!
lag Core static id 1
 ports ethe 1/3/2 ethe 2/3/2
!
spanning-tree single
!
vlan 1 name DEFAULT-VLAN by port
 spanning-tree
!
vlan 10 name CCTV by port
 tagged lag 1
 untagged ethe 1/1/1 to 1/1/21
 spanning-tree
!
vlan 20 name Voice by port
 tagged lag 1
 spanning-tree
!
vlan 30 name IPTV by port
 tagged lag 1
 spanning-tree
 multicast active
!
vlan 40 name Wireless by port
 tagged lag 1
 untagged ethe 1/1/22 to 1/1/46 ethe 2/1/1 to 2/1/12 ethe 3/1/1 to 3/1/12
 spanning-tree
!
vlan 50 name BMS by port
 tagged lag 1
 untagged ethe 1/1/47 to 1/1/48
 spanning-tree
!
vlan 99 by port
 tagged lag 1
 spanning-tree
!
vlan 100 name Guest by port
 tagged ethe 1/1/22 to 1/1/46 ethe 2/1/1 to 2/1/12 ethe 3/1/1 to 3/1/12 lag 1
 spanning-tree

!
spanning-tree single rstp
!

aaa authentication web-server default local
aaa authentication login default local
enable aaa console
hostname Access-10thFloor
ip address 172.24.1.10 255.255.255.0
!
no telnet server
username super password .....
!
!
!
hitless-failover enable
!
sz registrar

!
interface ethernet 1/3/4
 speed-duplex 1000-full
!

!
interface ethernet 2/3/4
 speed-duplex 1000-full
!

!
interface ethernet 3/3/2
 speed-duplex 1000-full
!
interface ethernet 3/3/4
 speed-duplex 1000-full
!
interface lag 1
 speed-duplex 1000-full

SSH@MDH-CORE-8thFloor#sh lag de
Total number of LAGs:          12
Total number of deployed LAGs: 12
Total number of trunks created:12 (244 available)
LACP System Priority / ID:     1 / d4c1.9e0f.7780
LACP Long timeout:             120, default: 120
LACP Short timeout:            3, default: 3
=== LAG "Floor10" ID 10 (static Deployed) ===
LAG Configuration:
   Ports:         e 1/1/6 e 2/1/6
   Port Count:    2
   Lag Interface: lg10
   Trunk Type:    hash-based
Deployment: HW Trunk ID 1
Port       Link    State   Dupl Speed Trunk Tag Pvid Pri MAC             Name
1/1/6      Up      Forward Full 1G    10    Yes N/A  0   d4c1.9e0f.7780
2/1/6      Up      Forward Full 1G    10    Yes N/A  0   d4c1.9e0f.7780

[mohammad_atmazi]

Hi

Check the stack I think it's a stack configuration mismatch.