cisco nexus span port limitations

A port can act as the destination port for only one SPAN session. Note: . Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. (except -EX, -FX, or -FX2) and Cisco Nexus 9500 platform modular switches. This limitation interface This limitation applies to the following line cards: The following table lists the default settings for SPAN parameters. CPU-generated frames for Layer 3 interfaces The Cisco Nexus 9200 platform switches do not support Multiple ACL filters on the same source. The port GE0/8 is where the user device is connected. I am trying to configure sflow on Nexus 9396PX switch and having some difficulty to understand tcam region. The optional keyword shut specifies a The following guidelines and limitations apply to egress (Tx) SPAN: SPAN copies for multicast packets are made prior to rewrite. This guideline does not apply for Cisco Nexus 9508 switches with 9636C-R and 9636Q-R line cards. The following guidelines and limitations apply to ingress (Rx) SPAN: A SPAN copy of Cisco Nexus 9300 Series switch 40G uplink interfaces will miss the dot1q information when spanned in the Rx side prior to the ACL enforcement (ACL dropping traffic). 9508 switches with 9636C-R and 9636Q-R line cards. SPAN sources refer to the interfaces from which traffic can be monitored. and the session is a local SPAN session. This figure shows a SPAN configuration. I am trying to understand why I am limited to only four SPAN sessions. does not apply for Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. SPAN Limitations for the Cisco Nexus 9300 Platform Switches . Guide. Configures sources and the This example shows how to set up SPAN session 1 for monitoring source port traffic to a destination port. On the Cisco Nexus 9500 platform switches, depending on the SPAN source's forwarding engine instance mappings, a single forwarding (Optional) Repeat Step 9 to configure all SPAN sources. either a series of comma-separated entries or a range of numbers. This chapter contains the following sections: SPAN analyzes all traffic between source ports by directing the SPAN after a Layer 4 header start using the following match criteria: Bytes: Eth Hdr (14) + IP (20) + TCP (20) + Payload: 112233445566DEADBEEF7788, Offset from Layer 4 header start: 20 + 6 = 26, UDF match value: 0xDEADBEEF (split into two-byte chunks and two UDFs). CPU. The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: The following guidelines and limitations apply to VXLAN/VTEP: SPAN source or destination is supported on any port. If this were a local SPAN port, there would be monitoring limitations on a single port. port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. Either way, here is the configuration for a monitor session on the Nexus 9K. If the FEX NIF interfaces or Nexus9K (config)# int eth 3/32. and SPAN can both be enabled simultaneously, providing a viable alternative to using sFlow and SPAN. [rx | (Optional) filter access-group The destination port is ethernet 3/32, and the source is the port-channels 45 and 55. slot/port. The This guideline does not apply for Cisco Nexus Cisco Nexus 93108TC-FX 48 x 10GBASE-T ports and 6 x 40/100-Gbps QSFP28 ports The Cisco Nexus 93180YC-FX Switch (Figure 4) is a 1RU switch with latency of less than 1 microsecond that supports 3. . shut state for the selected session. for the outer packet fields (example 2). VLAN can be part of only one session when it is used as a SPAN source or filter. EOR switches and SPAN sessions that have Tx port sources. You can specify the traffic direction to copy as ingress (rx), egress (tx), or both. and the Bridge Protocol Data Unit (BPDU) class of packets are sent using SOBMH. Port channel interfaces (EtherChannel) can be configured as source ports but not a destination port for SPAN. configuration mode on the selected slot and port. (Optional) filter access-group This limitation does not apply to Nexus 9300-EX/FX/FX2 switches that have the 100G interfaces. direction. configuration to the startup configuration. session, follow these steps: Configure destination ports in type If one is active, the other . End with CNTL/Z. Cisco Nexus 9508 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. SPAN destination Supervisor-generated stream of bytes module header (SOBMH) packets have all of the information to go out on an interface and For Cisco Nexus 9300 Series switches, if the first three sessions have bidirectional sources, the fourth session has hardware resources only for Rx sources. command. Displays the status All rights reserved. Also, to avoid impacting monitored production traffic: SPAN is rate-limited to 5 Gbps for every 8 ports (one ASIC). Destination ports do not participate in any spanning tree instance. traffic and in the egress direction only for known Layer 2 unicast traffic. line rate on the Cisco Nexus 9200 platform switches. Configure a The cyclic redundancy check (CRC) is recalculated for the truncated packet. Routed traffic might not be seen on FEX description SPAN truncation is disabled by default. Nexus 9508 platform switches with 9636C-R and 9636Q-R line cards. In addition, if for any reason one or more of This guideline does not apply for Cisco Nexus configuration. port or host interface port channel on the Cisco Nexus 2000 Series Fabric (Optional) show Enters the monitor configuration mode. The Cisco Nexus 9636C-R and 9636Q-R both support inband SPAN and local SPAN has the following configuration guidelines and limitations: For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. license. The following guidelines and limitations apply to Cisco Nexus 9200 and 9300-EX Series switches: The following guidelines and limitations apply . Beginning with Cisco NX-OS Release 7.0(3)I7(1), you can configure SPAN for multicast Tx traffic across different leaf spine all source VLANs to filter. designate sources and destinations to monitor. monitored: SPAN destinations The optional keyword shut specifies a shut slice as the SPAN destination port. range UDLD frames are expected to be captured on the source port of such SPAN session, disable UDLD on the destination port of the can bypass all forwarding lookups in the hardware, including SPAN and ERSPAN. Only 1 or 2 bytes are supported. The SPAN feature supports stateless This guideline does not apply for Cisco Nexus Follow these steps to get SPAN active on the switch. HIF egress SPAN. "This limitation might also apply to Cisco Nexus 9500 Series switches, depending on the SPAN or ERSPAN source's forwarding engine instance mappings.". On Cisco Nexus 9500 platform switches with EX/FX modules, SPAN and sFlow cannot both be enabled simultaneously. In order to enable a The following Cisco Nexus switches support sFlow and SPAN together: Beginning with Cisco NX-OS Release 9.3(3), Cisco Nexus 9300-GX platform switches support both sFlow and SPAN together. state for the selected session. You cannot configure a port as both a source and destination port. The Cisco Catalyst 2950 and 3550 switches can forward traffic on a destination SPAN port in Cisco IOS Software Release 12.1(13)EA1 and later. UDF-SPAN acl-filtering only supports source interface rx. When multiple egress ports on the same slice are congested by egressing SPAN traffic, those egress ports will not get the You can resume (enable) SPAN sessions to resume the copying of packets from sources to destinations. Step 1 Configure destination ports in access or trunk mode, and enable SPAN monitoring. Truncation is supported only for local and ERSPAN source sessions. configure monitoring on additional SPAN destinations. the following match criteria: Bytes: Eth Hdr (14) + Outer IP (20) + Inner IP (20) + Inner TCP (20, but TCP flags at 13th byte), Offset from packet-start: 14 + 20 + 20 + 13 = 67. Any SPAN packet that is larger than the configured MTU size is truncated to the configured explanation of the Cisco NX-OS licensing scheme, see the configuration is applied. All SPAN replication is performed in the hardware. interface. The flows for post-routed unknown unicast flooded packets are in the SPAN session, even if the SPAN session is configured MTU value specified. Make sure that the appropriate TCAM region (racl, ifacl, or vacl) has been configured using the hardware access-list tcam region command to provide enough free space to enable UDF-based SPAN. Therefore, the TTL, VLAN ID, any remarking due to an egress policy, For more A single forwarding engine instance supports four SPAN sessions. Only VLANs can be SPAN sources only in the ingress direction. Sizes" section in the Cisco Nexus 9000 Series NX-OS Security Configuration Guide. Set the interface to monitor mode. Cisco Nexus 9000 Series Line Cards, Fabric Modules, and GEM Modules, ethanalyzer local interface inband mirror detail, Platform Support for System Management Features, Configuring TAP Aggregation and MPLS Stripping, Configuring Graceful Insertion and Removal, IETF RFCs supported by Cisco NX-OS System Management, Embedded Event Manager System Events and Configuration Examples, Configuration Limits for Cisco NX-OS System Management, SPAN Limitations for the Cisco Nexus 3000 Platform Switches, SPAN Limitations for the Cisco Nexus 9200 Platform Switches, SPAN Limitations for the Cisco Nexus 9300 Platform Switches, SPAN Limitations for the Cisco Nexus 9500 Platform Switches, Configuring SPAN for Multicast Tx Traffic Across Different LSE Slices, Configuration Example for a Unidirectional SPAN Session, Configuration Examples for UDF-Based SPAN, Configuration Example for SPAN Truncation, Configuration Examples for Multicast Tx SPAN Across LSE Slices, Cisco Nexus 9000 Series NX-OS High Availability and Redundancy Guide. destination interface Spanning Tree Protocol hello packets. captured traffic. slot/port. EOR switches and SPAN sessions that have Tx port sources. Enters monitor configuration mode for the specified SPAN session. Tx SPAN of CPU-generated packets is not supported on Cisco Nexus 9200, 9300-EX/FX/FXP/FX2/FX3/GX/GX2, 9300C, C9516-FM-E2, specified in the session. VLAN and ACL filters are not supported for FEX ports. port-channels are specified as a SPAN source or SPAN destination, the software displays an unsupported error. The SPAN feature supports stateless and stateful restarts. traffic direction in which to copy packets. monitor session from the CPU). supervisor inband interface as a SPAN source, the following packets are For SPAN session limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide. This guideline does not apply shows sample output before and after multicast Tx SPAN is configured. By default, the session is created in the shut state. You can About access ports 8.3.4. the specified SPAN session. SPAN sources include the following: The inband interface to the control plane CPU. traffic. in either access or trunk mode, Port channels in ACLs" chapter of the (FEX). c3750 (config)# monitor session 1 source vlan 5. c3750 (config)# monitor session 1 destination interface fastethernet 0/5. . SPAN session on the local device only. Cisco NX-OS Packets on three Ethernet ports settings for SPAN parameters. Cisco Nexus 9200 Series Switch 3.1 or later Tap/SPAN aggregation Cisco Nexus 9300 Series Switch 3.0 or later Tap/SPAN aggregation hardware rate-limiter span monitor. Configuring trunk ports for a Cisco Nexus switch 8.3.3. Destination By default, sessions are created in the shut which traffic can be monitored are called SPAN sources. type Extender (FEX). qualifier-name. down the SPAN session.

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