Good afternoon,
Looking for any advice on my issues. We have a pair of C9300L-48P-4X-A at our core and three compact 9200CX and one 9200L-48. We swapped out a pair of 3750v2 and the other older 3750 and 2960 switches and had no issues prior to the swap.
We have a 40Mpbs MPLS connected to a 4321 isr router woth QoS enabled on the edge for internal and VOIP systems. We have a 100Mbps for internet traffic through a Fortigate firewall. Both the router and firewall are using OSPF with the sites device gateways pointed core switch and the core switch pointed to the firewall.
The site has a flat /24 network using VLAN 1, pretty basic. We are about to roll out NAC and 12 new VLAN's but only have the L2 and L3 SVI's up and routing at this time.
Our issue is after the swap out, our customers started to notice applications lagging or losing O365 authentication and the voice traffic also has been affected adversely with seemingly lost packets.(Both internet and intranet are laggy)
The show interface command doesn't show many output drops at all compared to the issues being reported but we were seeing a lot of Drop-TH2 errors on some interfaces but not all.
per TAC we enable "qos queue-softmax-multiplier 1200" and had a little bit of relief. We also found the uplink to the firewall was half duplex and fixed that.
We haven't had to enable QoS on switches and wouldn't think we would need to since everything was working well on the 3750's.
TAC doesn't seem to have much advice other than enabling QoS on the switch.
I did run the Cisco CLI Analyzer and it did find the following punts below but couldn't get anything back from TAC on the cause or remedy yet..
Cat9K_Punt_cause_drops_analyzer
This C9300L-48P-4X device running 17.6.4 experienced the following problem:
Following drops are found. Please check 'show platform software fed switch active punt cause summary' command
Drop found 103964 , cause info Glean adjacency.
Following non zero values found. Please check 'show platform software fed switch active punt cpuq all' command
Non zero value 2758 found for RX spurious interrupt - CPU Q ID 1.
Non zero value 32008 found for RX spurious interrupt - CPU Q ID 2.
Non zero value 130 found for RX spurious interrupt - CPU Q ID 4.
Non zero value 457868 found for RX spurious interrupt - CPU Q ID 5.
Non zero value 1760 found for RX spurious interrupt - CPU Q ID 12.
Non zero value 103964 found for RX dropped count - CPU Q ID 14.
Non zero value 103964 found for RX conversion failure dropped - CPU Q ID 14.
Non zero value 12102 found for RX spurious interrupt - CPU Q ID 14.
Non zero value 55 found for RX spurious interrupt - CPU Q ID 15.
Non zero value 591 found for RX spurious interrupt - CPU Q ID 20.
Any help from this forum would be awesome.
