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About Mirroring

About Mirroring

Dong1
New Contributor
Hello.

I would ask about mirroring.

When receiving (ingress) port mirroring, I can not see the VLAN-ID.

When sending (egress) port mirroring. I can see the vlan-id.

I would like to know how the mirroring process.

After vlan Decapsulation?

before?
3 REPLIES 3

Rebecca_Franco
Extreme Employee
Egress mirrored packets are always tagged when egressing the monitor port. If an egress mirrored packet is untagged on the egress mirrored port, the mirrored copy contains a tag with an internal VLAN ID.

Henrique
Extreme Employee
Hi DongWook,

The following conditions describe tagging of mirrored packets:
  • Untagged ingress mirrored traffic egresses the monitor port(s) untagged. Tagged ingress mirrored traffic egresses the monitor port tagged.
  • Egress mirrored traffic always egresses the monitor port tagged.
  • On Summit family switches, all traffic ingressing the monitor port or ports is tagged only if the ingress packet is tagged. If the packet arrives at the ingress port as untagged, the packet egresses the monitor port or ports as untagged.

Balaji
Extreme Employee
If the ingress port is untagged you will not see the VLAN-ID and i think th eegress port is tagged hence you see the VLAN-ID
GTM-P2G8KFN