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

Extended SPAN Sessions

Extended SPAN Sessions
Cisco NX-OS Release 6.2(2) and later releases support extended SPAN sessions in addition to the two
traditional SPAN sessions supported in prior releases. Extended SPAN sessions can be traditional 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 traditional sessions use two resources.
These 12 resources are shared between local and SPAN 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:
• The mode extended command must be used with the third configuration session.
• 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.

4K VLANs per SPAN Session

Cisco NX-OS Release 7.3(0)D1(1) and later releases support 4K VLANs per SPAN 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
SPAN 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 SPAN Session feature has the following characteristics:
• This is not supported on M3 series modules.
• You will not be able to capture any traffic on the M3 Series modules in spite of configuring thesource
• 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 SPAN

Rule-based SPAN filters the ingress or egress SPAN 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 SPAN traffic based on a combination of fields in the Layer 2, Layer
3, or Layer 4 header packet.
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interface all command.
enables traffic flow-based monitoring using a set of filter rules across the VDC.
Configuring SPAN