Dell S5148F-ON OS10 Enterprise Edition User Guide Release 10.3.2E-R2 - Page 186

Session and VLAN requirements, remote port monitoring, Reserved L2 VLAN, Source session, Restrictions

Page 186 highlights

Session and VLAN requirements Remote port monitoring requires a source session (monitored ports on different source devices), a reserved tagged VLAN for transporting monitored traffic (configured on source, intermediate, and destination devices), and a destination session (destination ports connected to analyzers on destination devices). • Configure any network device with source ports and destination ports and enable it to function in an intermediate transport session for a reserved VLAN at the same time for multiple remote port monitoring sessions. Enable and disable individual monitoring sessions. • A remote port monitoring session mirrors monitored traffic by prefixing the reserved VLAN tag to monitored packets to transmit using the reserved VLAN. • The source address, destination address, and original VLAN ID of the mirrored packet are prefixed with the tagged VLAN header. Untagged source packets are tagged with the reserved VLAN ID. • The member port of the reserved VLAN must have the MTU and IPMTU value as MAX+4 (to hold the VLAN tag parameter). • To associate with source session, the reserved VLAN can have a maximum of four member ports. • To associate with destination session, the reserved VLAN can have multiple member ports. • The reserved VLAN cannot have untagged ports. Reserved L2 VLAN • MAC address learning in the reserved VLAN is automatically disabled. • There is no restriction on the VLAN IDs used for the reserved remote monitoring VLAN. Valid VLAN IDs are from 2 to 4093. The default VLAN ID is not supported. • In monitored traffic, packets that have the same destination MAC address as an intermediate or destination device in the path used by the reserved VLAN to transport the mirrored traffic are dropped by the device that receives the traffic if the device has a L3 VLAN configured. Source session • Configure physical ports and port-channels as sources in remote port monitoring and use them in the same source session. You can use both L2 (configured with the switchport command) and L3 ports as source ports. Optionally configure one or more source VLANs to configure the VLAN traffic to be monitored on source ports. • Use the default VLAN and native VLANs as a source VLAN. • You cannot configure the dedicated VLAN used to transport mirrored traffic as a source VLAN. Restrictions • When you use a source VLAN, enable flow-based monitoring (flow-based enable). • In a source VLAN, only received (rx) traffic is monitored. • In S5148F-ON, only received (rx) traffic is monitored. • You cannot configure a source port-channel or source VLAN in a source session if the port-channel or VLAN has a member port configured as a destination port in a remote port monitoring session. • You cannot use a destination port for remote port monitoring as a source port, including the session the port functions as the destination port. • The reserved VLAN used to transport mirrored traffic must be a L2 VLAN - L3 VLANs are not supported. Configure remote port monitoring Remote port monitoring requires a source interface (monitored ports on different source network devices) and a reserved tagged VLAN for transporting mirrored traffic (configured on the source, intermediate, and destination devices). 1 Create a remote monitoring session in CONFIGURATION mode. monitor session session-id type rspan-source 186 Layer 2

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Session and VLAN requirements
Remote port monitoring requires a source session (monitored ports on
different
source devices), a reserved tagged VLAN for transporting
monitored
traffic
(configured
on source, intermediate, and destination devices), and a destination session (destination ports connected to
analyzers on destination devices).
Configure
any network device with source ports and destination ports and enable it to function in an intermediate transport session for
a reserved VLAN at the same time for multiple remote port monitoring sessions. Enable and disable individual monitoring sessions.
A remote port monitoring session mirrors monitored
traffic
by
prefixing
the reserved VLAN tag to monitored packets to transmit using
the reserved VLAN.
The source address, destination address, and original VLAN ID of the mirrored packet are
prefixed
with the tagged VLAN header.
Untagged source packets are tagged with the reserved VLAN ID.
The member port of the reserved VLAN must have the MTU and IPMTU value as MAX+4 (to hold the VLAN tag parameter).
To associate with source session, the reserved VLAN can have a maximum of four member ports.
To associate with destination session, the reserved VLAN can have multiple member ports.
The reserved VLAN cannot have untagged ports.
Reserved L2 VLAN
MAC address learning in the reserved VLAN is automatically disabled.
There is no restriction on the VLAN IDs used for the reserved remote monitoring VLAN. Valid VLAN IDs are from 2 to 4093. The default
VLAN ID is not supported.
In monitored
traffic,
packets that have the same destination MAC address as an intermediate or destination device in the path used by
the reserved VLAN to transport the mirrored
traffic
are dropped by the device that receives the
traffic
if the device has a L3 VLAN
configured.
Source session
Configure
physical ports and port-channels as sources in remote port monitoring and use them in the same source session. You can use
both L2
(configured
with the
switchport
command) and L3 ports as source ports. Optionally
configure
one or more source VLANs
to
configure
the VLAN
traffic
to be monitored on source ports.
Use the default VLAN and native VLANs as a source VLAN.
You cannot
configure
the dedicated VLAN used to transport mirrored
traffic
as a source VLAN.
Restrictions
When you use a source VLAN, enable
flow-based
monitoring (
flow-based enable
).
In a source VLAN, only received (
rx
)
traffic
is monitored.
In S5148F-ON, only received (
rx
)
traffic
is monitored.
You cannot
configure
a source port-channel or source VLAN in a source session if the port-channel or VLAN has a member port
configured
as a destination port in a remote port monitoring session.
You cannot use a destination port for remote port monitoring as a source port, including the session the port functions as the
destination port.
The reserved VLAN used to transport mirrored
traffic
must be a L2 VLAN — L3 VLANs are not supported.
Configure
remote port monitoring
Remote port monitoring requires a source interface (monitored ports on
different
source network devices) and a reserved tagged VLAN for
transporting mirrored
traffic
(configured
on the source, intermediate, and destination devices).
1
Create a remote monitoring session in CONFIGURATION mode.
monitor session
session-id
type rspan-source
186
Layer 2