Hello everyone,
Today, I will introduce how to handle the uplink packet loss problem of CE switches.
Alarm Information
The burst traffic extends buff with packets loss logs:
Handling Process
1. From the logs we found there have many packets drop:
ToR-1:From Aug 7 2018 there have packets drop in 10GE1/0/48.
Aug 7 2018 14:28:21+03:00 HQ-ToR-1 %QOS/6/QOS_PACKET_DROP(l):CID=0x807f042d;The forwarding engine detects packet discard.(Slot=1, Discard place=Panel Port Ifindex[52] Queue[0], Current discard=781)
ToR-2:From Aug 29 2018 there have packets drop in 10GE1/0/48.
Aug 29 2018 13:09:42+03:00 DR-ToR-2 %QOS/6/QOS_PACKET_DROP(l):CID=0x807f042d;The forwarding engine detects packet discard.(Slot=1, Discard place=Panel Port Ifindex[52] Queue[0], Current discard=1274)
burst traffic extend and packets drop:
2. From the configuration we found customer have 6*10ge port connect to server, But there only 1*10GE as a uplink, If there have any burst traffic.it will cause the drop in milliseconds.
3. The burst traffic extends buff with packets loss logs:
Root Cause
The burst traffic extend buffering cause the packets drop
Solution
1. Enable the traffic buffering to the enhanced mode in discard port example: (interface which face the packets drop issue)
<HUAWEI> system-view
[~HUAWEI] interface 10ge 1/0/1
[~HUAWEI-10GE1/0/1] qos burst-mode enhanced
2. Increase the link bandwidth, Example Change the uplink from 10GE to 40GE link
That is all I want to share with you!