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January 7th, 2025 19:35

Routing Problem with one VLAN only

Have two sets of two S4128's (installed in pairs at two sites) utilising OSPF routing with 20 VLANS. 19 VLANS working correctly, one is not.
Hardware Revision          : A00
Software Version           : 10.5.6.5

Having a strange issue with routing for one specific VLAN.

With both switches VLAN 125 interfaces active traffic is not able to route out to the rest of the network, as soon as I shutdown the interface on Switch 01 traffic is able to reach the internet. As soon as enabled again it stops working. 

This has happened before and deleting the VLAN (not this one) on both switches and re entering the config strangely fixed the issue. This time however it has not. 

Switch 01

interface vlan125
 description HQ-Guest-VLAN
 no shutdown
 mtu 1532
 ip address 192.168.125.252/24
 no ipv6 mld snooping
 ip ospf 1 area 0.0.0.0
 ip ospf passive
 no ip igmp snooping
 !
 vrrp-group 125
  virtual-address 192.168.125.1
!

Switch 02

interface vlan125
 description HQ-Guest-VLAN
 no shutdown
 mtu 1532
 ip address 192.168.125.253/24
 no ipv6 mld snooping
 ip ospf 1 area 0.0.0.0
 ip ospf passive
 ip access-group Guest in
 no ip igmp snooping
 !
 vrrp-group 125
  priority 150
  virtual-address 192.168.125.1
!

The other two switches in the other building same model same config are working completely fine. 

Any suggestions of where to start ?

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