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liam.williams.ebc
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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 ?
liam.williams.ebc
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Posted January 8th, 2025 17:40
Hi,
Clearing the ACL off switch 2 did fix the issue.
Can you give me an example ACL to prevent traffic reaching the other subnets.
Many thanks
DELL-Chris H
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Posted January 8th, 2025 18:05
You can find the examples of different type ACLs on page 477 here.
Let me know if this is what you were referring to.
DELL-Chris H
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Dell Technologies | Enterprise Support Services
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DELL-Marco B
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Posted January 8th, 2025 11:42
Hello,
can you check VRRP status? You can see it with show vrrp.
Please check that switch02 is Master and Switch01 is backup.
Check also IP address.
Can you try also to remove the guest ACL on switch02 to see problem disappear.
Thanks
DELL- Marco B
Social Media and Communities Professional
Dell Technologies | Enterprise Support Services
#IWork4Dell
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