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S5130S-28P-HPWR-EI Frequent switch port flapping

2022-02-25 17:34:13 Published
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Network Topology

Figure below illustrate a portion of the IP Phone installation for Block A Level 13 to Level 16. There are average 20 IP phones installed on each level. All phones are using only one VLAN.


Problem Description

S5130S-28P-HPWR-EI POE switches are used to supply power to the ALE-30H phone. However,  port oscillations frequently occurring which affected the IP Phone keep rebooting.

1. Figure below showed the log of link flapping (display logbuffer reverse)


Process Analysis

  1. Stack the sw01 and sw02 devices on level 13 and config the port isolation on each phone device port. It did not solve the issue of port flapping and ip phone on same level unable to communicate with each other when port isolation is configured
  2. It was observed that mac address drifting occur at uplink port 24, attempt to configure acl rules on the uplink port to match all the downlink phone terminals mac with the behavior rule as deny, and it is applied to the uplink port inbound direction.  Mac drift has stopped, but the physical port keep flapping.
  3. Attempt to add new VLAN ID to eliminate port issues on switch.  Port flapping issue remained.
  4. ​It was observed that port flapping issue occur on switches that is cascaded more than 5 layers. Shutdown all interfaces on switches at layer 5 and up the interface one by one. Port flapping issues occur again after more than 5 interfaces is up.
  5. ​Optimize STP network by enabling PVST on the switch to establish spanning tree negotiation with upstream device. It was confirmed Alc device able to negotiate using PVST. Port flapping issue not improved.
  6. ​It was observed the phone will send out an EAPOL logoff packet when the ip phone reboot during packet capturing. Configure packet filtering rules in the outbound direction of the switch upstream interface connected to the WBC server through Alc switch. Port flapping issue solved and ip phone no longer reboot.

Solution

1. Optimize STP network by enabling PVST on the switch to establish spanning tree negotiation with upstream device. It was confirmed Alc device able to negotiate using PVST.

# Enable STP and PVST globally     

    stp global enable 

    stp mode pvst 


# Configure edge port on all interfaces connected to IP Phone

interface GigabitEthernet1/0/20 

stp edged-port


2. Applying the mqc configuration on the global inbound direction of every switch to block the forwarding of 802.1X packets sent by the ip phone (eapol logoff)

# Create ACL 4006 to match the mac of the 802.1x packet 

acl number 4006 

rule permit dest-mac 0180-c200-0003 ffff-ffff-ffff 

quit 


# Create a class named 4006, and use ACL 4006 as the match criterion 

traffic classifier 4006 

if-match acl 4006 

quit 


# Create a behavior named 4006, and configure filter deny. 

traffic behavior 4006 

filter deny 

quit 


# Create a QoS policy named 4006, and associate the class 4006 with the behavior 4006 in the QoS policy. 

qos policy 4006 

classifier 4006 behavior 4006 

quit 


# Apply the QoS policy 4006 to the inbound direction. 

qos apply policy 4006 global inbound 


# Checking the MQC is successfully configured

probe 

debug qacl show slot 1 c 0 v 0 a 1 



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