Wired Intelligent Edge (Campus Switching and Routing)

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Occasional Contributor I

Aruba Switch -2920 Port Flapping - Aruba AP's Connected

Hi All,

One of my customer is facing issue with port flapping on the Switch when I checked the Switch logs its saying due to STP (The Port is Blocked by STP)  after 2 seconds the ports come up and the issue reoccurs after 30 mins. The other end of the Switch is connected to Aruba 207 Access Points. So, due to this port flapping the access points are going up & down. Please find the attachment of the Screenshot. I don't understand why it's happening. Can I disable the STP on those ports? or put them in ADMIN-EDGE ports ?
Please suggest. 

Thank you.!!!

MVP Expert

Re: Aruba Switch -2920 Port Flapping - Aruba AP's Connected

Port flapping has many causes...what devices are connected on flapping ports (I see many ports actually flapping)?

What is the output of show power brief ethernet x (where x is the port's number) related to flapping port?

What software version is running your Aruba 2920?

Admin edge generally would be set on any port connected to access device (such as an host) with the command spanning-tree ethernet x admin-edge-port but, nevertheless, you should investigate first why a port flaps while another doesn't...that's because the admin edge option just sets the involved port into immediate forwarding state (shortening the typical Blocking -> Listening -> Learning -> Forwarding spanning tree phases).

Eventually you would provide sanitized running configuration to help diagnosing what is going on...
Occasional Contributor I

Re: Aruba Switch -2920 Port Flapping - Aruba AP's Connected

What are the causes for port flapping? 

devices connected to those ports are Aurba Access points 205 /215

 

Software Version is 16.01.0006

 

Find the attachment for the "show power brief ethernet all"

So on those ports  can I  use Admin-edge command as access points are connected on to it. 

RUNNING CONFIGURATION :

HP-2920-24G-Floor-1-POE# show run

Running configuration:

interface 4
; Ver #0c:00.34.59.14.29.eb.8f.fc.f3.ff.37.2d:d2

hostname "HP-2920-24G-Floor-1-POE"
module 1 type j9727a
no timesync
sntp unicast
ip default-gateway 192.168.220.1
interface 1
poe-allocate-by value
poe-value 15
exit
interface 2
poe-allocate-by value
poe-value 15
exit
interface 3
poe-allocate-by value
poe-value 15
exit
poe-allocate-by value
poe-value 15
exit
interface 5
poe-allocate-by value
poe-value 15
exit
interface 6
poe-allocate-by value
poe-value 15
exit
interface 7
poe-allocate-by value
poe-value 15
exit
interface 8
poe-allocate-by value
poe-value 15
exit
interface 9
poe-allocate-by value
poe-value 15
exit
interface 10
poe-allocate-by value
poe-value 15
exit
interface 11
poe-allocate-by value
poe-value 15
exit
interface 12
poe-allocate-by value
poe-value 15
exit
interface 13
poe-allocate-by value
poe-value 15
exit
interface 14
poe-allocate-by value
poe-value 15
exit
interface 15
poe-allocate-by value
poe-value 15
exit
interface 16
poe-allocate-by value
poe-value 15
exit
interface 17
poe-allocate-by value
poe-value 15
exit
interface 18
poe-allocate-by value
poe-value 15
exit
interface 19
poe-allocate-by value
poe-value 15
exit
interface 20
poe-allocate-by value
poe-value 15
exit
interface 21
poe-allocate-by value
poe-value 15
exit
interface 22
poe-allocate-by value
poe-value 15
exit
interface 23
poe-allocate-by value
poe-value 15
exit
snmp-server community "public" unrestricted
oobm
ip address dhcp-bootp
exit
vlan 1
name "DEFAULT_VLAN"
no untagged 2-23
tagged 1,24
no ip address
exit
vlan 7
name "VLAN7"
no ip address
exit
vlan 21
name "VLAN21"
tagged 1-24
no ip address
jumbo
exit
vlan 22
name "VLAN22"
no ip address
exit
vlan 101
name "Events"
tagged 1-24
no ip address
exit
vlan 103
name "VLAN103"
tagged 1-22,24
no ip address
exit
vlan 104
name "EVENTS1"
tagged 1-24
no ip address
exit
vlan 107
name "VLAN107"
tagged 1-24
no ip address
jumbo
exit
vlan 210
name "VLAN210"
untagged 2-20
tagged 24
no ip address
jumbo
exit
vlan 211
name "VLAN211"
tagged 24
no ip address
exit
vlan 212
name "VLAN212"
tagged 24
no ip address
exit
vlan 213
name "VLAN213"
tagged 24
no ip address
exit
vlan 214
name "VLAN214"
no ip address
exit
vlan 215
name "VLAN215"
no ip address
exit
vlan 216
name "VLAN216"
tagged 24
no ip address
exit
vlan 220
name "VLAN220"
tagged 24
ip address 192.168.220.10 255.255.255.0
exit
spanning-tree
no tftp server
no autorun
no dhcp config-file-update
no dhcp image-file-update
password manager
password operator

HP-2920-24G-Floor-1-POE#




Thank You..!!

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