Extended Erspan Session; 4K Vlans Per Erspan Session; Rule-Based Erspan - Cisco Nexus 7000 Series Configuration Manual

Extended ERSPAN Session

Extended ERSPAN Session
Cisco NX-OS Release 6.2(2) and later releases support extended ERSPAN sessions in addition to the two
traditional ERSPAN sessions in prior releases. Extended ERSPAN sessions can be bidirectional or
unidirectional. The session direction is specified during session creation. A pool of 12 independent session
resources are available. Unidirectional sessions use one resource, and bidirectional use two resources. These
12 resources are shared between local and ERSPAN source sessions across all VDCs.
If you are configuring an extended SPAN session on a Cisco Nexus 7710 switch or a Cisco Nexus 7718
switch, the following applies:
• You do not need to use the mode extended command. All sessions are extended by default.
• You can configure 16 sessions as unidirectional or bidirectional, as required.
• You do not need to maintain two traditional sessions.
• You do not need to use the resource manager to reserve the two traditional sessions.
• ERSPAN ACL-based filtering is not supported.

4K VLANs per ERSPAN Session

Cisco NX-OS Release 7.3(0)D1(1) and later releases support 4K VLANs per ERSPAN session. You can use
the source interface all command to enable the monitor session on the switch to monitor all VLANs and
ports in the VDC such as physical ports, Port Channels, FEX ports and FEX Port Channels. The 4K VLANs
per ERSPAN Session feature also enables monitoring of a higher number of specific VLAN sources than the
VLAN source limits currently supported in the monitor session by using the filter vlan command with the
source interface all command to filter the irrelevant VLANs.
The 4K VLANs per ERSPAN Session feature has the following characteristics:
• You can use the source interface all command for multiple sessions in the same VDC.
• Supports all session parameters such as MTU truncation, Sampling and Rate Limiting.
• Simple and Complex Rule-based SPAN is supported with the source interface all command. This
• Traffic generated by Supervisors is not spanned.
• Supported only in Ethernet VDCs of Cisco Nexus 7000 Series switches.
• Supported only in extended SPAN sessions.

Rule-Based ERSPAN

Rule-based ERSPAN filters the ingress or egress ERSPAN traffic based on a set of rules. For Cisco NX-OS
releases prior to 6.2(2), you can filter on VLANs, the destination index, and the source index. Beginning with
Cisco NX-OS Release 6.2(2), you can filter the ERSPAN traffic based on a combination of fields in the Layer
2, Layer 3, or Layer 4 header packet.
Cisco Nexus 7000 Series NX-OS System Management Configuration Guide
330
enables traffic flow-based monitoring using a set of filter rules across the VDC.
Configuring ERSPAN