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Latency While Pinging Gateway of Vlan's Which is in our Core Switch

Latency While Pinging Gateway of Vlan's Which is in our Core Switch

Thavamani_Shanm
New Contributor III
Hello, We have a BD8810 core switch and few models of Extreme EXOS Edge switches (like X430, X440, X460). All of our servers are connected to our core switch. Clients are connected in our Edge Switches. Our core switch having multiple VLAN's. Each vlan have own Tag ID. So, required VLAN's are created in our Edge Switches with relevant Tag ID in core switch. Now, the issue is, From past two days we are facing a issue while pinging the Gateway IP addresses of each VLAN's which are configured in our core. The issue is, reply time in ms is more than 150ms. It was less than 1ms previously. We don't know where the actual issue is? In configuration or is any loop or any slot problem in core. Please help us to resolve this issue.
19 REPLIES 19

Michal_Rz
New Contributor III
Have you fix your problem Thavamani by blocking mDNS?

Thavamani_Shanm
New Contributor III
Sir, Thanks. We are Planning to add ACL entry to block mDNS Packets. Where this ACL should be added? In Core switch? or all the edge switches? This will be very helpful to fix our issue.

Thavamani_Shanm
New Contributor III
Sir, We have analyze the Packet capture file with WireShark. From the analysis, we found that, Most of the entries shows with MDNS protocol along with the IP address 224.0.0.251 and 224.0.0.252. All these packets comes from the WiFi networks. Is this the source for high CPU utilization of our core switch?
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