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S9300 switch mirroring function feature, due to device architecture design

Publication Date:  2012-07-27 Views:  61 Downloads:  0
Issue Description
SW: S9300 V100R002C00SPC002.
After configuring port link-type trunk and pvid vlan, outbound traffic in pvid vlan is tagged with pvid vlan on observing port.
Port configuration:
interface GigabitEthernet5/0/35
  port link-type trunk
  port trunk pvid vlan 1631
  undo port trunk allow-pass vlan 1
  port trunk allow-pass vlan 1631 2131 2631 2881 3131 3631
  port-mirroring to observe-port 1 both
  dhcp option82 insert enable
In attachments - packets captures from mirroring port.
Alarm Information
Null
Handling Process
1. Check pakets on observing port - they are tagged.
2. Check packets on mirrored port - they are untagged, according default vlan configuration.
3. Ask HQ for solution: HQ answered - it is device desing, packets are send to observing port before vlan tag is deleted from them.
Root Cause
Packets which should be untagged - are transmitted in tagged mode.
Suggestions
Update documentation section about traffic mirroring configuration - all packets on observing port will be tagged, because packets are send to observing port before vlan tag is deleted from them.

END