•
ERSPAN Type III provides configurable switch IDs that can be used to identify traffic flows across
multiple switches.
Table 29: Differences between ERSPAN Type II and ERSPAN Type III
Type IIIType IIAttribute
Timestamp provided.NATimestamp
Platform-specific info is
required for Nexus 5500,
Nexus 5600 and Nexus 6000
platforms.
NAPlatform-specific info
Detailed identification.
Provision of switch IDs.
Limited identification.Source Port Identification at
Termination Switch
ERSPAN Sources
The interfaces from which traffic can be monitored are called ERSPAN sources. Sources designate the traffic
to monitor and whether to copy ingress, egress, or both directions of traffic. ERSPAN sources include the
following:
•
Ethernet ports and port channels.
• VLANs—When a VLAN is specified as an ERSPAN source, all supported interfaces in the VLAN are
ERSPAN sources.
ERSPAN source ports have the following characteristics:
•
A port configured as a source port cannot also be configured as a destination port.
•
ERSPAN does not monitor any packets that are generated by the supervisor, regardless of their source.
ERSPAN Destinations
ERSPAN destination sessions capture packets sent by ERSPAN source sessions on Ethernet ports or port
channels and send them to the destination port. Destination ports receive the copied traffic from ERSPAN
sources.
ERSPAN destination sessions are identified by the configured source IP address and ERSPAN ID. This allows
multiple source sessions to send ERSPAN traffic to the same destination IP and ERSPAN ID and allows you
to have multiple sources terminating at a single destination simultaneously.
ERSPAN destination ports have the following characteristics:
•
A port configured as a destination port cannot also be configured as a source port.
•
Destination ports do not participate in any spanning tree instance or any Layer 3 protocols.
•
Ingress and ingress learning options are not supported on monitor destination ports.
Cisco Nexus 5600 Series NX-OS System Management Configuration Guide, Release 7.x
OL-31641-01 195
Configuring ERSPAN
ERSPAN Sources
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