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Tagged versus untagged ports in vlans – Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide User Manual

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ACL and rate limiting effects

TABLE 40

ACL profile

Ingress result

Egress result

Ingress ACL on port

Packets ingress mirrored at expected
(sent) rate

Packets egress mirrored at expected
(sent) rate

Egress ACL on port

Packets ingress mirrored at expected
(sent) rate

Packets egress mirrored at expected
(sent) rate

Ingress rate limiting on port Packets ingress mirrored at expected

(sent) rate

Packets egress mirrored at the limited
rate

Egress rate shaping on port Packets ingress mirrored at expected

(sent) rate

Packets egress mirrored at expected
(sent) rate

Tagged versus untagged ports in VLANs

The following table describes how VLAN-based mirroring coexists with port mirroring, assuming a
VLAN consisting of one ingress and one egress port.

VLAN-based mirroring and port mirroring effects

TABLE 41

Packets sent VLAN-based

mirroring direction

Which port in VLAN
is monitored

Ingress mirror traffic
count expectation

Egress mirror traffic
count expectation

10000

Ingress

Ingress

~10000

~0

10000

Egress

Egress

~0

~20000

10000

Ingress

Egress

~10000

~10000

10000

Egress

Ingress

~10000

~10000

The above table can be summarized into the following two rules, assuming that VLAN-based mirroring
and port mirrroring are operating concurrently.

• If the VLAN is ingress monitored, and ports belonging to the VLAN are also ingress monitored, the

ingress traffic is only mirrored once and there are no duplicated mirrored packets.

• If the VLAN is egress monitored and ports belonging to the VLAN are also egress monitored, the

egress traffic is mirrored for each egress port, as well as the VLAN, resulting in several duplicated
mirrored packets. The count of duplicate packets is computed as (1 + Number of egress mirrored
ports in the VLAN) * Number of egress packets.

In addition to the previously mentioned rules, the behavior of VLAN-based mirroring is affected by the
tag type of the ports belonging to that VLAN, as shown in the following table.

VLAN-based mirroring behavior: Tagged versus untagged ports

TABLE 42

Ingress tag type

Egress tag type

VLAN-based mirroring direction

Mirrored traffic tag type

Untagged

Untagged

Ingress

Untagged

Untagged

Untagged

Egress

Tagged

Tagged versus untagged ports in VLANs

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FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide

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