12-10-2017 03:39 AM - edited 03-08-2019 01:03 PM
we have 2 vdc in 2 physical box(7718) and vpc between theM but when i am pinging vdc1 l3 vlan getting high latency and while pinging vdc2 l3 vlan ping hop are fine.
SW01 vdc1
Reply from 10.142.33.2: bytes=32 time=3ms TTL=255
Reply from 10.142.33.2: bytes=32 time=539ms TTL=255
Reply from 10.142.33.2: bytes=32 time=2ms TTL=255
Reply from 10.142.33.2: bytes=32 time=578ms TTL=255
Reply from 10.142.33.2: bytes=32 time=2ms TTL=255
Reply from 10.142.33.2: bytes=32 time=447ms TTL=255
Reply from 10.142.33.2: bytes=32 time=2ms TTL=255
Reply from 10.142.33.2: bytes=32 time=451ms TTL=255
vdc2
Reply from 10.142.7.3: bytes=32 time=1ms TTL=254
Reply from 10.142.7.3: bytes=32 time=1ms TTL=254
Reply from 10.142.7.3: bytes=32 time=2ms TTL=254
Reply from 10.142.7.3: bytes=32 time=2ms TTL=254
Reply from 10.142.7.3: bytes=32 time=2ms TTL=254
Reply from 10.142.7.3: bytes=32 time=1ms TTL=254
Reply from 10.142.7.3: bytes=32 time=1ms TTL=254
Reply from 10.142.7.3: bytes=32 time=1ms TTL=254
what may be exact issue,any suggestions are welcome.
12-10-2017 05:11 AM
From where to where are you pinging, from VDC1 to VDC2 ? Across the VPC ?
12-13-2017 09:56 PM
03-27-2018 11:30 PM
Hello Prakash,
NEXUS 7718 VDC ISSUE, getting letency when pinging any SVI
Check if you have Igmp join-group on SVI configured .
07-10-2018 02:34 AM
Hello,
the issue got fixed by implementing one solution on our nexus device.
as previous, we were running Pvst and we have approximately 150 L3 VLANs, and 150 access layer neighbor.
This situation was creating multiple logical ports in the device as per N7K its maximum limit is 16000. so as I observed nexus gives less priority to ICMP packets and ssh packets.
There is command by which check how much logical ports are in the device.
Switch#"sh spanning-tree internal info global"
Total stp_ports*instance:11263
Total ports vlan:11263
Total physical port*vlan :11682
as we have above situation because we did trunk all VLANs toward access layer and vice versa.
after investigating further we did VLAN pruning and amazingly situation got changed.
Switch#"sh spanning-tree internal info global"
Total stp_ports*instance:2000
Total ports vlan:2000
Total physical port*vlan :2145
after this, we are getting 1MS reply to pinging any interface ping.
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