https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hi-latency-between-isc-peers/m-p/119410#M23052 <P>Today we started seeing very high latency between our ISC peers.&nbsp; I am getting roughly 20ms ping times between the two.&nbsp; The links show up and don't have collisions or errors on them at this time.&nbsp; All VLANs match on the links that are shared across.&nbsp; I am using 2 40Gb links on a pair of 5520-12mw-36w switches.&nbsp; Any thoughts on what could be causing this high of latency?</P> Tue, 29 Jul 2025 14:15:44 GMT vandermause 2025-07-29T14:15:44Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hi-latency-between-isc-peers/m-p/119410#M23052 <P>Today we started seeing very high latency between our ISC peers.&nbsp; I am getting roughly 20ms ping times between the two.&nbsp; The links show up and don't have collisions or errors on them at this time.&nbsp; All VLANs match on the links that are shared across.&nbsp; I am using 2 40Gb links on a pair of 5520-12mw-36w switches.&nbsp; Any thoughts on what could be causing this high of latency?</P> Tue, 29 Jul 2025 14:15:44 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hi-latency-between-isc-peers/m-p/119410#M23052 vandermause 2025-07-29T14:15:44Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hi-latency-between-isc-peers/m-p/119412#M23053 <P>One thing I have noticed is that port 49 on my ISC link is going to port 53 and port 53 is going to port 49 between the two peers.&nbsp; Sharing is setup as 49 as the master port.&nbsp; Could this be causing an issue?</P> Tue, 29 Jul 2025 15:05:23 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/hi-latency-between-isc-peers/m-p/119412#M23053 vandermause 2025-07-29T15:05:23Z